JP2005148864A - Data server - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To include an extended unit which can be connected to a bus connection input/output part owned by a programmable controller(PLC) in the same system as that of a PLC, and to provide even data to be obtained from the extended unit to a monitor device. <P>SOLUTION: This data server 2 is configured of a network communicating part 21, a condition setting part 22 for storing the storage conditions of data, a low order communication part 231 and a bus connection input/output part 233 connected to the PLC and an extended unit respectively, an input/output control part 24 which collects data from the PLC and the extended unit via the low order communication part 231 and the bus connection input/output 233 according to the storage conditions, a data storing part 251 which stores the collected data, and a display data generating part 26 which provides the data stored in the data storing part 251 via the network communication part 21 to the monitoring device. This data server 2 is included in a remote monitor system. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a data server that is connected to a monitoring device via an upper communication network and provides collected data to the monitoring device via an upper communication network.

  Conventionally, various data servers and remote monitoring systems of this type have been proposed. For example, Patent Document 1 includes an industrial network computer that is connected to a measurement device to which a measurement target is connected through serial communication and collects the latest data from the measurement device at a fixed period, and a WWW (World Wide Web) browser function. A system is disclosed that is configured by connecting a display terminal such as a personal computer with a network via a network. In this system, the display terminal downloads an HTML (HyperText Markup Language) file from a WWW server and displays it on the screen, while downloading an applet (Java (R) program) for displaying data from an industrial network computer, Based on the applet, it communicates with an industrial network computer at regular intervals to display the latest data.

  In Patent Document 2, a computer system connected to a data collection unit that collects data from various facilities and a monitoring center are connected via a communication network, and data is collected at the monitoring center to the computer system. A facility monitoring system comprising a condition input unit for arbitrarily inputting conditions for data collection to the unit and a condition setting unit for setting the conditions from the condition input unit via a communication network is disclosed. Yes.

Patent Document 3 discloses a controller having a data recording unit that records operation data obtained from various detectors and a data conversion / transmission unit that converts the operation data recorded on the detector into HTML and transmits the protocol conversion device and transmission. In addition, a management system is disclosed in which a personal computer having a WWW browser function is connected to a communication network via a router. In this management system, the operation data is transmitted from the controller to the personal computer via the communication network.
JP 11-219214 A (page 4-5, FIG. 4) JP 2001-258080 A (3rd page, FIG. 1) JP 2002-244936 A (Page 3, FIG. 1)

  However, each of the above conventional techniques has only a general-purpose interface such as a digital I / O or a serial I / O to which a monitored device, a measuring device or a sensor is connected, and is an extension unit connected by a bus to a programmable controller. There was a problem that it was not possible to make use of such assets.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a data server and a remote monitoring system that can make use of assets such as an extension unit connected to a programmable controller by a bus.

  The invention according to claim 1 for solving the above-mentioned problem is a data server connected to a monitoring device via a higher-level communication network and providing the collected data to the monitoring device, and a condition for holding data accumulation conditions An input / output control unit that includes a setting unit and a bus connected to the bus connection input / output device, collects data according to the accumulation conditions held in the condition setting unit, and stores data collected by the input / output control unit Generating data to be displayed on the monitoring device based on the data stored in the data storage unit, the network communication unit connected to the host communication line side and communicating according to a predetermined protocol, and the data stored in the data storage unit A display data generation unit, and a display data storage unit having a server function for providing display data generated by the display data generation unit are provided. In this configuration, by providing the bus connected to the bus connection input / output device, it is possible to make use of assets such as an extension unit connected to the programmable controller by a bus.

  According to a second aspect of the present invention, in the data server according to the first aspect, the input / output control unit is provided with a built-in input / output unit that is connected to the device under test and takes in data. In this configuration, since the data server itself has a function of measuring data, a small-scale monitoring system can be configured at a low cost and in a small size.

  According to a third aspect of the present invention, in the data server according to the first aspect, a lower-level communication unit that communicates with a device having a serial communication interface is provided in the input / output control unit. With this configuration, it is possible to communicate with a device having a serial communication interface.

  According to a fourth aspect of the present invention, in the data server according to the first aspect, the bus connection input / output device is an extension unit connected to a bus of a programmable controller. In this configuration, it is possible to make use of the assets of the extension unit connected to the bus of the programmable controller.

  According to a fifth aspect of the present invention, in the data server according to the third aspect, the lower communication unit is configured to be replaceable. In this configuration, the communication interface (RS232C, RS485, etc.) can be easily changed according to the user's request.

  According to a sixth aspect of the present invention, in the data server according to the third aspect, the communication program of the lower communication unit is stored in a rewritable nonvolatile memory. With this configuration, it is possible to easily cope with various communication means.

  According to a seventh aspect of the present invention, in the data server according to the first aspect, the data stored in the data storage unit is monitored and held in the condition setting unit when it is detected that the data is in a predetermined state. According to a notification condition, the network communication unit or the input / output control unit is provided with an external notification unit that outputs a notification signal indicating that data is in a predetermined state. In this configuration, it is possible to notify that the data is in a predetermined state via the network communication unit or the input / output control unit.

  The invention according to claim 8 is the data server according to claims 1 to 3, wherein the data stored in the data storage unit is monitored, and the condition setting is performed when it is detected that the data is in a predetermined state. The input / output control unit includes an external notification unit that outputs a control signal or data for controlling an external device in accordance with a control condition held in the unit. In this configuration, the external device can be controlled in response to the data being in a predetermined state.

  According to a ninth aspect of the present invention, in the data server according to the seventh or eighth aspect, the external notification unit has an e-mail transmission function, monitors the data stored in the data storage unit, and the data is in a predetermined state. An e-mail notifying that is transmitted to the e-mail address stored in the condition setting unit when it is detected that the condition has been met. In this configuration, it is possible to confirm by e-mail that the data is in a predetermined state.

  According to a tenth aspect of the present invention, in the data server according to the seventh or eighth aspect, the external notification unit has a function of calling a telephone terminal, monitors the data stored in the data storage unit, and the data is stored in the data storage unit. When it is detected that a predetermined state is reached, the telephone terminal having the telephone number stored in the condition setting unit is called. In this configuration, it is possible to confirm with the telephone terminal that the data has entered a predetermined state.

  According to an eleventh aspect of the present invention, in the data server according to the second aspect, the built-in input / output unit detects a pulse edge of the input pulse signal and provides a dedicated CPU for interrupting the main CPU of the data server. It is characterized by having. In this configuration, the main CPU can be concentrated on the original processing.

  According to a twelfth aspect of the present invention, in the data server according to the first aspect, the monitoring device includes a general-purpose WWW browser, and the display data generation unit generates display data in HTML format in response to a request from the general-purpose WWW browser. It is characterized by doing. In this configuration, since a general-purpose WWW browser can be used, remote monitoring can be performed without using dedicated software, and there is no need to purchase dedicated software.

  According to a thirteenth aspect of the present invention, in the data server according to the twelfth aspect, the data transmitted to the monitoring device and stored in the data storage unit is fetched via the display data storage unit and displayed on the monitoring device. A display program storage unit for storing a display program is provided. With this configuration, it is possible to easily perform remote monitoring using a general-purpose WWW browser, and it is not necessary to purchase dedicated software.

  According to a fourteenth aspect of the present invention, in the data server according to the twelfth aspect, the display program stored in the display program storage unit is a JAVA (R) applet including information on an IP address of the data server, and the monitoring After being transmitted to the device, it is detected that the IP address of the data server has been changed, and the IP address held by itself is changed to the changed IP address. Features. With the change of the IP address of the data server, it is very troublesome to modify all the display programs stored in the display program storage unit. In addition, there is a problem that communication is not possible if the work is wrong. In the present invention, since the IP address owned by itself is automatically changed, it is possible to cope with the change of the IP address of the data server without any problem.

  According to a fifteenth aspect of the present invention, in the data server according to the first aspect, the network communication unit determines whether the packet is addressed to the data server, and transfers only the packet addressed to the data server to the main CPU of the data server. A communication dedicated CPU is provided. In this configuration, the main CPU can be concentrated on the original processing.

  According to a sixteenth aspect of the present invention, in the data server according to the first aspect, the data storage unit includes a plurality of areas corresponding to various types of data having different capturing timings and capturing periods, and is collected from a connection device. A buffer area for holding the data, and the latest data collected from the connection device is individually held in the corresponding area of the buffer area and updated at the time of each capture corresponding to the type of the data When the latest data is requested from the monitoring device, the data held in the buffer area is transmitted to the monitoring device. In this configuration, when the latest data is requested from the monitoring device, a quick response can be made by transmitting the data held in the buffer area to the monitoring device.

  According to a seventeenth aspect of the present invention, in the data server according to the first aspect, the display data storage unit displays an electronic bulletin board that displays maintenance information and the like that can be written by an administrator of the data server or a user of the monitoring device. It is characterized by having a function. In this configuration, by using the electronic bulletin board, a simple operation can be provided to the data server administrator or the monitoring device user without being aware of the interface for operating the data server. In addition, the latest information can be obtained by browsing an electronic bulletin board suitable for the purpose.

  According to an eighteenth aspect of the present invention, in the data server according to the first aspect, the display data storage unit displays a command input screen on which a user of the monitoring device inputs a command for the data server, and a response to the command. It has a function of displaying a response screen to be displayed on the monitoring device or a function of executing processing corresponding to a command. In this configuration, the monitoring apparatus can display a response to the command input by the user, and can execute a process corresponding to the command.

  According to a nineteenth aspect of the present invention, in the data server according to the seventh or eighth aspect, the external notification unit has an e-mail transmission function and is held in the condition setting unit of the data server by a user of the monitoring device. When a request to rewrite the information is received, an e-mail describing that fact is transmitted, and when the user of the monitoring device accesses the data server based on the information described in the e-mail, The information stored in the condition setting unit is rewritten. In this configuration, the user of the monitoring device can access the data server without knowing the IP address of the data server, and can safely rewrite the information held in the condition setting unit of the data server.

  According to a twentieth aspect of the present invention, in the data server according to the seventh or eighth aspect, the external notification unit has an e-mail transmission function, and transmits an e-mail describing information necessary for communication with the data server. When the user of the monitoring device accesses the data server based on information described in an e-mail, communication is permitted. With this configuration, communication security can be enhanced.

  According to a twenty-first aspect of the present invention, in the data server according to the first aspect, the time of the clock unit that communicates with the time server via the host communication line and outputs the time information is corrected. With this configuration, it is possible to self-correct the time of the clock unit in the data server.

  According to a twenty-second aspect of the present invention, the data server according to the first aspect includes a detachable and rewritable non-volatile large-capacity memory, and the data storage section can be rewritten at a higher speed than the large-capacity memory. And a memory backed up by a backup power source, and the data stored in the memory is copied to the large-capacity memory. In this configuration, even if the power is turned off during data writing, it is difficult to be affected by the power off, and the final data writing to the large-capacity memory can be guaranteed.

  According to a twenty-third aspect of the present invention, in the data server according to the first aspect, the data storage unit is composed of a memory backed up by a backup power source, and a circuit for measuring the remaining power of the backup power source measures the remaining power. It is characterized in that it is connected to the backup power source only when With this configuration, the service life of the backup power supply can be extended.

  According to the present invention, assets such as an extension unit connected to the programmable controller by a bus can be utilized.

(Embodiment 1)
FIG. 1 is a configuration diagram of a data server according to the first embodiment of the present invention, and FIG. 2 is a schematic configuration diagram of a remote monitoring system including the data server.

  As shown in FIG. 2, the remote monitoring system of the first embodiment includes a monitoring device 1 and a data server 2 that are connected so as to be capable of bidirectional communication via an Internet L1 as a host communication network. At least one of a controller 31, an expansion unit 32 connected to an existing programmable controller by a bus, and a device under test 33 such as a wattmeter that outputs a no-voltage pulse is connected.

  The monitoring device 1 includes, for example, a computer, a monitor, a keyboard, a mouse, and the like, and has various programs such as a WWW browser installed in advance on the computer.

  The data server 2 is provided in the system LS connected to the monitoring device 1 via the Internet L1 together with a plurality of connection devices 3, and provides data collected from the connection device 3 to the monitoring device 1 via the Internet L1. It is. As shown in FIG. 1, the data server 2 includes a network communication unit 21, a condition setting unit 22, an input / output control unit 23, a data storage unit 24, a display data storage unit 25, and a display data generation unit 26. A display content storage unit 27, a display program storage unit 28, an external notification unit 29, and a data file transfer unit 30. The input / output control unit 23 includes a lower communication unit 231, a bus connection input / output unit 232, and a built-in input / output unit 233. The data server 2 includes a main CPU, a predetermined program executed by the main CPU, and a main storage device that stores the predetermined program. However, these are omitted from illustration, and the main CPU executes the predetermined program as shown in FIG. Each part shown in FIG.

  The network communication unit 21 includes a network interface that performs communication according to a protocol such as TCP / IP. The network communication unit 21 may include a communication interface for performing communication via an intranet, a public telephone line network, or the like in addition to the Internet. The network communication unit 21 is configured to select a communication line, a communication condition, and a communication partner according to the communication conditions stored in the condition setting unit 22.

  The condition setting unit 22 includes, for example, a readable / writable nonvolatile memory, and holds data storage conditions, notification conditions for notification, communication conditions for communication, and the like. The conditions held in the condition setting unit 22 are configured to be set or changed by the regular monitoring device 1 via the network communication unit 21.

  The lower-level communication unit 231 is configured by an interface that performs communication according to a serial communication protocol such as RS-232C or RS-485, and is connected to the communication port of the programmable controller 3 (31) in each connection device 3. Here, since the communication port is normally capable of communication such as RS-232C or RS-485, if the terminal of the lower communication unit 231 is designed to that of RS-232C, for example, RS-485 The terminal cannot be connected to the programmable controller 3 having the terminal as a communication port. In such a case, the RS-232C <-> RS-485 conversion adapter is inserted to convert the interface. The device connected to the lower communication unit 231 is not limited to the programmable controller.

  As shown in FIGS. 1 and 2, the bus connection input / output unit 232 is mounted with the same bus as that for connecting an extension unit in the programmable controller 3 (31). That is, an extension unit for a programmable controller can be connected to the bus connection input / output unit 232. A plurality of extension units can be connected to the bus of the bus connection input / output unit 232 at the same time. The extension unit 3 (32) includes various units such as a highly reliable I / O unit, an analog unit, a thermocouple unit, and a pulse count unit that satisfy strict standards such as the CE standard.

  The built-in input / output unit 233 is connected to the digital signal input / output unit of the device under test 3 (33) in each connection device 3, and is connected to, for example, a wattmeter that outputs a no-voltage pulse.

  The input / output control unit 23 is connected to the programmable controller 31 and the extension unit 32 via the lower-level communication unit 231, the bus connection input / output unit 232, and the built-in input / output unit 233, respectively, according to the storage conditions held by the condition setting unit 22. The data is collected from the device under test 33 and the data collected from the connection device 3 is stored in the data storage unit 24.

  The data storage unit 24 is configured by an SRAM backed up by a battery or an electric double layer capacitor, and the display content storage unit 27 and the display program storage unit 28 are configured by a nonvolatile flash memory and an SDRAM.

  The display data generation unit 26 creates an HTML file from the content such as graphics stored in the display content storage unit 27 and the data stored in the data storage unit 24 and stores the HTML file in the display data storage unit 25. The display data storage unit 25 has a WWW server function for providing the HTML file in addition to the function of storing the HTML file. The display data storage unit 25 stores the HTML file in accordance with the request of the WWW browser of the monitoring device 1 and the network communication unit 21. This is provided to the monitoring device 1 via the communication network.

  Next, an operation that characterizes the first embodiment will be described. Here, it is assumed that the condition setting unit 22 stores storage information such as a connection device and an input port used for collecting data, an acquisition timing, an acquisition cycle, and the like in advance. Further, it is assumed that an HTML file for displaying a processing menu is stored in the display data storage unit 25 in advance.

  When the system LS is activated, in the data server 2, the input / output control unit 23 refers to the accumulation condition stored in the condition setting unit 22, and the programmable controller and bus connection input / output unit 232 connected to the lower communication unit 231. The data is collected according to the accumulation condition from either the extension unit connected to the device or the device under test connected to the built-in input / output unit 233, and the collected data is stored in the data storage unit 24 in time series.

  When a user accesses the data server 2 by specifying a URL using the WWW browser function of the monitoring device 1, the display data storage unit 25 having the WWW server function sends an HTML file for displaying a processing menu to the network communication unit 21. To the monitoring device 1. As a result, the screen of the processing menu is displayed on the monitor of the monitoring device 1, and when the user selects the processing for displaying the predetermined data and requests the data server 2 to display the predetermined data, the display data storage unit 25 The request is transferred to the display data generation unit 26. The display data generation unit 26 extracts necessary data from the data storage unit 24 to generate an HTML file for a data display screen, and extracts a content file such as an image to be displayed on the data display screen from the display content storage unit 27. And the HTML file are transferred to the display data storage unit 25. Then, the display data storage unit 25 uses the WWW server function to provide an HTML file and a content file for the data display screen to the monitoring device 1 via the communication interface unit 21, so that data is displayed on the monitor by the WWW browser function. The display screen is displayed.

  In the first embodiment, the built-in input / output unit 233 realizes a function of inputting a digital voltage signal from a device under test and directly capturing the data itself, and the lower-level communication unit 231 collects data from a device having a serial interface. Although the functions are realized, by providing the bus connection input / output unit 232, the assets of the expansion unit (hardware and software for controlling the hardware) can be utilized. Point data can be collected. In addition, since a plurality of extension units can be connected to the bus connection input / output unit 232 at the same time, it can be easily expanded according to the scale of the system. Furthermore, since all the collected various data are temporarily stored in the data storage unit 24 so that the data can be handled in a unified manner, the degree of freedom of data processing can be increased, and data backup, There is an advantage that statistical processing, arithmetic processing using a plurality of data, judgment processing combining a plurality of data, and the like can be easily performed. In addition, since the data is centrally managed and provided to the monitoring device 1 by the WWW server function, the user interface can be unified with a general-purpose WWW browser, and the data listability can be improved. Furthermore, since the display screen is displayed using a highly versatile HTML file, the user can easily customize the display screen.

  Furthermore, since the data storage unit 24 is an SRAM backed up by a battery, the data collected by the input / output control unit 23 can be stored and retained even when power is not supplied.

(Embodiment 2)
FIG. 3 is an explanatory diagram of a notification example by the data server according to the second embodiment of the present invention.

  The data server 2 according to the second embodiment is configured in the same manner as in the first embodiment, and the external notification unit 29 notifies the monitoring device 1 via the network communication unit 21 according to the notification conditions stored in the condition setting unit 22. Or broadcast information is transmitted to the connection device 3 via the input / output control unit 23.

  As a specific example, as shown in FIG. 3, the external notification unit 29 indicates that a predetermined condition is satisfied in the monitoring device 1 or the connection device 3 based on notification conditions such as time information, contact information, or data upper / lower limit information. Or the preset predetermined information (including data) is stored.

  The time information is information on the time (including date designation) at which notification is performed. The contact information is information for designating the digital signal input terminal such as the built-in input / output unit 233, the extension unit, and the programmable controller, and the state thereof. Based on this information, the state of the designated digital signal input terminal is monitored. When the state of the digital signal input terminal becomes a predetermined state, a notification operation is performed. Data upper / lower limit information is the upper limit of data such as the time until the state of the digital signal input terminal changes (contact state change interval), cumulative ON time, cumulative open / close count, number of input pulses, energy value, analog voltage value, etc. And information specifying a lower limit value, for example, configured to notify when the value of specified data falls outside the range of the set upper and lower limit values.

  There are five types of notification methods shown in FIG. “Mail transmission” is a method in which the network communication unit 21 is provided with an electronic mail transmission function, sets that an electronic mail is used as a notification means for notification conditions, and sets a predetermined email address as a notification condition as a notification destination. Thus, the notification information embedded in the body of the electronic mail or the attached document can be transmitted to a terminal having an electronic mail receiving function via the Internet or the like. The monitoring device 1 may have an e-mail receiving function, but is not limited to this.

  “Telephone notification” is a method for calling a terminal such as a mobile phone having a telephone number set in advance through a public telephone line when a predetermined notification condition is satisfied, or a synthesized voice indicating that the predetermined notification condition is satisfied. It is a method of using and notifying a user. However, the present invention is not limited to this, and a method of calling the terminal with a single ringing tone (so-called “single”) may be used. In this case, a communication fee can be avoided.

  “Web notification” is a method of displaying notification information on the WWW browser of the monitoring device 1. A Java (R) that sets a WWW server as notification means for notification conditions and periodically fetches notification information from the data server 2 in advance. This can be realized by transmitting the program to the monitoring apparatus 1. In FIG. 1, the Java® program is stored in advance in the display program storage unit 28 and is transmitted to the monitoring device 1 by the display data storage unit 25 that is a WWW server.

  “Data storage” is a method of recording information (notification factor data) about what notification condition is satisfied in the data storage unit 24 as a notification history (action trigger history), and a user can use a WWW browser. It is possible to confirm whether a predetermined notification condition is satisfied by referring to the notification history using.

  “Control output” controls the state of the digital signal output terminal of the built-in input / output unit 233, extension unit, programmable controller, etc. when a predetermined notification condition is satisfied, and is connected to the digital signal output terminal, for example. This is a method of informing by turning on a warning light. As mentioned above, although 5 types of methods were shown as an alerting | reporting method, you may use combining these methods.

(Embodiment 3)
The data server 2 according to the third embodiment of the present invention is configured in the same manner as in the second embodiment, and whether the external notification unit 29 satisfies the control condition in which the data stored in the data storage unit 24 is stored in the condition setting unit 22. On the other hand, when the input / output control unit 23 obtains a monitoring result satisfying the control condition from the external notification unit 29, the lower communication unit 231, the bus connection input / output unit 232, and the built-in input / output unit 233 A predetermined control signal corresponding to the monitoring result is output to at least one connection device 3 via at least one.

  In this configuration, when a monitoring result that the data stored in the data storage unit 24 satisfies the control condition stored in the condition setting unit 22 is obtained, at least one predetermined control signal corresponding to the monitoring result is transmitted. By outputting to the connection device 3, the connection device 3 can be appropriately controlled in accordance with the current state.

  For example, an analog unit that outputs an analog voltage signal may be connected to the extension unit, and at the time of notification, a predetermined analog voltage signal may be output to control the set temperature of the temperature regulator or the like.

(Embodiment 4)
4 and 5 are explanatory diagrams of extensibility for the lower-level communication unit of the data server according to the fourth embodiment of the present invention.

  The data server 2 according to the fourth embodiment is characterized in that the lower communication unit 231 is a replaceable cassette type as a difference from the above embodiments. Specifically, as shown in FIGS. 4 and 5A, a cassette-type lower-level communication unit 231 is detachably attached to the data server 2. In the example of FIG. 5A, the cassette-type lower communication unit 231 is prepared for serial communication such as RS-232C or RS-485. Note that reference numeral 231a in FIG. 4 denotes a driver IC. Further, in FIG. 5A, 243 is a lid fitted in a CF slot, 235 is an input / output terminal of the built-in input / output unit 233, and 236 is an Ethernet connected to a higher-level communication network (Internet) provided in the network communication unit 21. The (R) port 237 is an RS-232C connector for connecting the host communication network to the monitoring apparatus 1 via a modem as a serial line.

  As shown in FIG. 4, the communication program of the lower-level communication unit 231 is stored in a rewritable nonvolatile memory unit 201 and can be rewritten using a personal computer or a CF (Compact Flash (R)).

  According to the data server 2 having the above-described configuration, the lower communication unit 231 is a replaceable cassette type, so that the desired programmable controller 3 (31) is connected to the data server 2 by replacing the lower communication unit 231. can do. In addition, since the communication program of the lower communication unit 231 is stored in a rewritable nonvolatile memory, the communication program can be easily changed.

  In the fourth embodiment, the communication program of the lower communication unit 231 is stored in the memory unit 201 in the data server 2. However, as illustrated in the example of FIG. The memory unit 231b may be provided and stored.

  In the fourth embodiment shown in FIG. 4, it is necessary to switch the communication program to be stored in the memory unit 201 in accordance with the specification of the lower communication unit 231 to be incorporated. In addition, by configuring the communication program to be stored in the memory unit 231b, the communication program can be changed when the lower-level communication unit 231 is replaced. The interface provided in the cassette type lower communication unit 231 may be Ethernet (R).

  Further, as a modification of the fourth embodiment, as shown in FIG. 5B, in the state where the expansion unit 32 is mounted on the side surface of the data server 2, a dedicated bus connector 238 for connecting to the expansion unit 32 is provided. May be provided as a bus connection input / output unit. In the case of this configuration, the extension unit 32 also needs to be provided with a connector for connecting to the dedicated bus connector 238 on the side surface side. Reference numeral 239 denotes a DIN rail mounting structure, and the extension unit 32 can also be mounted on the DIN rail adjacent to the data server 2.

(Embodiment 5)
FIG. 7 is a diagram showing a built-in input / output unit and a main CPU in the data server according to the fifth embodiment of the present invention, and FIGS. 8 to 10 are operation flowcharts of the data server.

  As shown in FIG. 7, the data server 2 of the fifth embodiment differs from the above embodiments in that a built-in input / output unit 233 includes a main unit that forms an input / output control unit 23, a display data generation unit 26, and the like. In addition to the CPU 200a, the CPU 200b includes a dedicated CPU 200b and has a function of detecting a pulse edge for interruption in its own input unit.

  Here, when detecting both the rising edge from on to off and the falling edge from off to on of the pulse train signal from the external device under test, generally when detecting an edge by the CPU interrupt processing, the interrupt request is Since only the rising or falling edge operates, both edges cannot be detected by the interrupt process. Therefore, the main CPU constantly monitors the pulse train signal at a short time interval according to the assumed pulse train signal width and detects an edge. However, as shown in FIG. 8, the main CPU performs data collection (S1), data accumulation (S2), condition determination (S3), external notification (S4), network communication (S5), and display data generation (S6). Since various processes such as file transfer (S7) are executed, if an edge is further detected, the pulse train signal must be monitored while executing the above processes (S9). This hinders the original processing of the main CPU.

  For this reason, in the fifth embodiment, a dedicated CPU 200b is mounted on the built-in input / output unit 233 separately from the main CPU 200a, and both edges are detected by the CPU 200b. When detecting an edge, the CPU 200b outputs an edge detection interrupt signal to the CPU 200a to notify that the edge has been detected. When receiving the edge detection interrupt signal, the CPU 200a inputs the logic of the pulse train signal and determines whether the edge is rising or falling.

  Specifically, an external pulse train signal is input to the CPUs 200a and 200b. In the CPU 200b, the sampling value of the previous pulse train signal is stored in the internal memory (S10 in FIG. 9), the sampling value of the current pulse train signal is obtained (S11), both sampling values are compared (S12), and both sampling values are obtained. If there is a change (Yes in S13), an edge detection interrupt signal is output to the main CPU 200a, and if there is no change (No in S13), the process returns to Step S10.

  When the CPU 200a receives the edge detection interrupt signal from the CPU 200b (S15 in FIG. 10), the sampling value of the pulse train signal is obtained (S16). If the sampling value is the ON value, the rising edge is detected (S18), and the OFF value If so, a falling edge is detected (S19), and a predetermined process corresponding to the detected edge is executed (S20).

  According to the data server 2 of the fifth embodiment, since the CPU 200a performs processing after edge detection only when an edge occurs, for example, when the pulse train signal does not change at all or when the pulse train signal is not input, Can concentrate on the processing.

  Furthermore, an ideal square wave is not always input to a normally input signal due to chattering or noise. By adopting this configuration, when detecting an edge by the CPU 200b, not only a simple signal change but also a method of confirming a pulse train signal change from a plurality of signal monitoring results, chattering, noise, etc. The process of eliminating the influence due to the unstable state of the signal can be realized only by the CPU 200b without imposing a load on the main CPU 200a. Further, in this method, since the CPU 200b is used to remove chattering, noise, and the like by software, the processing method can be changed according to the use environment of the data server.

(Embodiment 6)
FIG. 11 is a diagram showing a screen display example on the monitoring device by the data server according to the sixth embodiment of the present invention.

  The data server 4 according to the sixth embodiment is configured in the same manner as in the first embodiment and stores a program (Java applet) for receiving data stored in the data storage unit 24 in the display program storage unit 28. Then, when the display data storage unit 25 provides the data stored in the data storage unit 24 to the monitoring device 1 via the network communication unit 21, the program stored in the display program storage unit 28 is monitored. On the other hand, the monitoring device 1 communicates with the display data storage unit 25 based on the program, and receives and processes the data stored in the data storage unit 24.

  In addition, the display content storage unit 27 stores files such as characters and images to be displayed on the monitor of the monitoring device 1 and objects such as analog meters. These files are files that are transmitted to the monitoring device 1 only once when the monitoring device 1 needs to display a predetermined image. The data to be displayed changes, and the monitor screen of the monitoring device 1 is rewritten. Even if it becomes necessary, the file does not need to be retransmitted.

In the example of FIG. 11, in the monitoring device 1, data stored in the data storage unit 24 is displayed on the monitor screen as an analog meter format object. A plurality of analog meter format objects are displayed on one screen, each of which is set with its own data stored in a predetermined address of the data storage unit 24 as a parameter, and adjusts the meter instruction according to the value. The display contents of FIG. 11 are described in, for example, the following in html (HyperText Markup Language) and stored in the display program storage unit 28.
・ // Communication applet (at least one per page)
<applet name = "Comm" code = "Comm.class" width = 600 height = 150>
<param name = "ipaddr" value = "192.168.1.100">
<param name = "port" value = "5555">
<param name = "renew_timing" value = 1000>
・ </ Applet>
// See GD0, meter that can display from 0 to 5000 (square shape)
// "GD" is the name given to the memory area of the data server 2, and is in the format of GD + address No.
<applet code = "Meter.class" width = 250 height = 150>
<param name = "ref_data" value = GD00>
<param name = "style" value = "rect">
<param name = "min" value = "0">
<param name = "max" value = "5000">
<param name = "count" value = 5>
・ </ Applet>
// See GD1, meter that can display from 0 to 10000 (circular)
<applet code = "Meter.class" width = 200 height = 150>
<param name = "ref_data" value = GD01>
<param name = "style" value = "circle">
<param name = "min" value = "0">
<param name = "max" value = "10000">
<param name = "count" value = 5>
</ applet>
Next, the communication flow between the monitoring device 1 and the data server 2 will be described. First, an applet stored in the display program storage unit 28 of the data server 2 is downloaded to the monitoring device 1. Subsequently, the monitoring device 1 checks which area of the data storage unit 24 in the data server 2 needs to be referenced based on the communication applet. In the example of FIG. 11, there are two meters, and each refers to the memory area (GD) of the data storage unit 24 of the data server 2. Subsequently, the monitoring device 1 periodically communicates using the IP address of the data server 2 and the determined port number based on the communication applet, and the data storage unit 25 via the display data storage unit 25. The necessary data is acquired from 24. Subsequently, based on each applet, the monitoring device 1 refers to the acquired data and displays it on the monitor.

  According to the sixth embodiment, even when the data to be displayed changes and the monitor screen of the monitoring device 1 needs to be rewritten, files that do not need to be retransmitted are stored in the display content storage unit 27, and these files are stored. Is transmitted to the monitoring device 1 only when the screen is displayed for the first time, and the data to be displayed is updated by the Java (R) applet. Therefore, when the data is updated, the file stored in the display content storage unit 27 is monitored. It is possible to update only the display that changes according to the data without having to re-send to 1 and communicating with the data server 2 at a constant cycle and re-displaying the entire monitor screen of the monitoring device 1. Therefore, the display update load of the monitoring device 1 and the communication load between the monitoring device 1 and the data server 2 can be reduced.

  Further, the configuration of the screen to be displayed on the monitor of the monitoring device 1 and the data acquisition procedure in the data server 2 are determined by the Java applet stored in the display program storage unit 28, so that it matches the configuration of the connection device 3. Can be easily customized, and changes such as version upgrades are easy.

(Embodiment 7)
The data server 2 according to the seventh embodiment of the present invention is configured in the same manner as in the sixth embodiment, and is configured such that a Java (R) applet stored in the display program storage unit 28 refers to the IP address of the data server 2. When the IP address of the data server 2 is changed, the changed IP address is embedded in the Java (R) applet and transmitted to the monitoring device 1, and the data server held by the Java (R) applet at a predetermined timing The second IP address is updated. Thereby, even when the IP address of the data server 2 is changed, the monitoring device 1 can obtain a new IP address of the data server 2, so that the monitoring device 1 can be changed even if the IP address of the data server 2 is changed. Can communicate with the data server 2.

  More specifically, the condition setting unit 22 stores the IP address of the data server 2 in a rewritable manner. When the IP address of the data server 2 is changed, the IP address stored in the condition setting unit 22 is updated. The IP address is rewritten. In addition, the Java (R) applet refers to the IP address stored in the condition setting unit 22 and compares it with the IP address of the data server 2 set in advance in the monitoring device 1. The IP address stored in the applet is configured as the data server 2 IP address.

  The timing for updating the IP address of the data server 2 is, for example, the timing shown in the following (1) to (5).

(1) When the monitoring device 1 is turned on (when the monitoring device 1 is connected to a higher-level communication network)
(2) When the monitoring device 1 logs in to the data server 2 (3) When a file is uploaded from the monitoring device 1 to the display content storage unit 27 of the data server 2 (4) A condition input unit (keyboard, When a new IP address of the data server 2 is set with a mouse or the like and the new IP address becomes valid. (5) When a Java (R) applet is downloaded to the monitoring device 1. The data server 2 having the above configuration is included. In the remote monitoring system, the monitoring device 1 communicates with the data server 2 based on the communication applet and acquires data of the data server 2. At this time, the monitoring device 1 performs communication using the IP address of the data server 2 and the port number determined in advance for communication based on the communication applet. An applet is described as follows, for example.

<applet name = "Comm" code = "Comm.class" width = 600 height = 150>
<param name = "ipaddr" value = "192.168.1.100">
<param name = "port" value = "5555">
<param name = "renew_timing" value = 1000>
</ applet>
Here, if the IP address of the data server 2 is changed from, for example, “192.168.1.100” to “192.168.1.200”, the data server 2 detects this, and the data storage unit 25 The HTML file stored in the file is searched to find the description location of the communication Java (R) applet related to the IP address of the data server 2, and the description location “192.168.1.100” is found. It is configured to be rewritten to “192.168.1.200”.

  However, since the description regarding this applet may not be included in the HTML file, such as when the IP address of the data server 2 is set to a fixed IP address, first, “<apple name =“ Comm ”” in the HTML file. Is searched for a line in which the keyword "" is described, and it is confirmed whether or not the description is related to the Java (R) applet for communication. If there is no description, the processing for the HTML file ends, and the process proceeds to the same processing for another HTML file. If the line exists, check whether “<param name =“ ipaddr ”value =“ ”” is described between the line and the line where the keyword “</ applet>” appears for the first time. If so, it is rewritten to “value =“ 192.168.1.200 ””. Further, the same processing is repeated with the HTML file.

  According to the seventh embodiment, even if the IP address of the data server 2 is changed, the IP address included in the applet is automatically changed, so that it is not necessary to modify the applet which is very troublesome, and the IP address is manually set. It is possible to prevent communication failure due to a correction mistake when changing the address.

(Embodiment 8)
FIG. 12 is a diagram showing a network communication unit and a main CPU in the data server according to the eighth embodiment of the present invention.

  As shown in FIG. 12, the data server 2 according to the eighth embodiment includes a dedicated CPU 200c that communicates according to a predetermined protocol, apart from the main CPU 200a, as shown in FIG. It is characterized by that.

  A LAN controller (not shown) is used for the network communication unit 21. The LAN controller performs signal processing using a modulation method suitable for a communication medium such as an optical fiber or a metal wire, and reduces the load on the main CPU 200a so that communication can be performed without considering the communication medium. However, since the LAN controller alone also transfers data other than the data addressed to itself to the main CPU 200a, the CPU 200a that executes the various processes shown in the example of FIG. Transferring data from the network communication unit 21 is a heavy burden. In particular, as shown in the example of FIG. 12, in the configuration connected to the Internet L1 via the network L2, for example, data addressed to other devices connected to the network L2 such as IEEE 802.3 is transmitted from the network communication unit 21. It is transferred to the main CPU 200a. Also, in an environment that is directly connected to the Internet L1 or Intranet and communicates with TCP / IP or the like, a great variety of packets for homepage browsing, e-mail, file transmission / reception, etc. are transmitted / received. Data that is not addressed to itself increases.

  Therefore, in the eighth embodiment, in addition to the main CPU 200a, a dedicated CPU 200c is mounted on the network communication unit 21, and the CPU 200c determines whether or not the data is addressed to itself. Is transferred to the main CPU 200a.

  Specifically, the network communication unit 21 including the CPU 200c and the like is connected to the network L2, and the CPUs 200a and 200c are connected, for example, via a bus. The CPU 200c receives the IP address of the data server 2 from the main CPU 200a at the time of initialization, fetches a packet from the network L2 after initialization, and when the destination IP address in the packet matches its own IP address, The packet is determined to be addressed to itself, and the reception interrupt and the reception data in the packet are transmitted to the CPU 200a. When the main CPU 200a receives a reception interrupt, the main CPU 200a executes processing for the reception data.

  Further, at the time of transmission, the CPU 200a transmits a transmission interrupt and transmission data to the CPU 200c. Upon receiving the transmission interrupt, the CPU 200c transmits a packet including the transmission data onto the network L2.

  In other words, the CPU 200c also responds to global packets flowing on the network L2, and the main CPU 200a processes the packets transmitted to itself, thereby reducing the communication processing burden on the main CPU 200a. Also, when transmitting a packet, data is normally transmitted / received to / from a destination terminal according to a predetermined communication procedure, but this processing can also be left to the CPU 200c to reduce the burden on the transmission processing of the main CPU 200a. Therefore, the main CPU 200a can be effectively used for the original processing shown in FIG.

(Embodiment 9)
In the data server 2 according to the ninth embodiment of the present invention, the data storage unit 251 is provided with a buffer area that individually holds the latest values of various data collected from the connection device 3, and the various data stored in the buffer area Are individually updated with the latest data.

  Specifically, for example, the data storage unit 251 includes a storage area backed up by a battery and a buffer area of a volatile memory, and dedicated areas corresponding to various data to be measured are individually provided in the buffer area. When the latest data is collected from the connection device 3, the data in the dedicated area corresponding to the type of the data is rewritten to the latest data, and the collected latest data is stored in the accumulation area in time series. It is configured as follows.

  Through the input / output control unit 24 including the lower-level communication unit 231, the bus connection input / output unit 232, and the built-in input / output unit 233, various types of data having different measurement cycles and capture timings are separately input to the data storage unit 251. However, since it is configured to collect various latest data in the buffer area and update them individually, if there is a request for the latest data from the monitoring device 1, the data stored in the buffer area may be transmitted. Processing such as searching for the latest data from the time-series data stored in the storage area becomes unnecessary, and the processing program can be simplified and the response speed can be increased. This embodiment is particularly effective when the monitoring device 1 performs a list of the latest data. In addition, it was explained that the buffer area is composed of volatile memory, but this is the case when the latest data in the buffer area may be erased due to a power failure, etc. May be.

(Embodiment 10)
FIG. 13 is a block diagram of a remote monitoring system including the data server according to the tenth embodiment of the present invention, FIG. 14 is a diagram showing an example of screen display on a monitoring device using the electronic bulletin board function of the data server, and FIG. FIG.

  As shown in FIG. 13, the data server 2 according to the tenth embodiment provides an electronic bulletin board that is used with a plurality of monitoring devices 1 connected via the Internet L1, as shown in FIG. The electronic bulletin board function 2b is provided, and the electronic bulletin board can display, for example, information including items to be agreed, maintenance information, and trouble information.

  In the example of FIG. 13, the electronic bulletin board function 2b is included in the WWW server function 2a of the display data storage unit 25, which is a WWW server, and is configured to be executed under the WWW server 2a.

  In the WWW system constituted by the WWW server function 2a and the WWW browser function, as shown in FIG. 14A, a URL (Uniform Resource Locator) includes a list of electronic bulletin boards ("data server unit bulletin board list"). The page P1 includes a page switching item (a so-called hyperlink item) such as “maintenance”, “status”, “communication item”, “add bulletin board”, and the like.

  Of the above items, for example, when the “maintenance” item is designated (clicked) with the mouse of the monitoring device 1, the page is switched to the page P2 shown in FIG. This page P2 includes various input fields such as a handle name input field P21, a mail address input field P22, a title input field P23, and a content input field P24, and the ones after the posting time. And a plurality of display fields 26a and 26b displayed in FIG. In the input fields P21 to P24, maintenance information performed from the monitoring device 1 side is entered by a user on the monitoring device 1 side. In the display field 26a, for example, the title “scheduled for maintenance” input in the input field P23, the name of the poster by the handle name input in the input field P21, the posting date and time, and the input field P24 are input. Contents such as the scheduled maintenance date and time are displayed. In the display field 26b, for example, the title “maintenance complete” input in the input field P23, the name of the poster by the user's handle name input in the input field P21, the posting date and time, and the input field P24 are input. The contents of maintenance results such as the battery OK, the memory check OK, and the communication check OK are displayed.

  When the item “status” is designated, the page P3 shown in FIG. Similarly to page P2, this page P3 also includes various input fields such as an author's handle name input field P31, an email address input field P32, a title input field P33, and a content input field P34, and a posting time. A plurality of display fields 36 displayed on the upper side are included in the later ones. In this case, the contributor becomes the data server 2, and his / her state information is input by the data server 2 to the input fields P31 to P34 and is automatically posted. Accordingly, each display column P36 includes, for example, a status such as a title “status report”, a contributor name based on the handle name of the data server 2, a posting date and time, a self-diagnosis error OK, a memory error OK, a power supply error OK Is displayed. Here, as shown in FIG. 15, the data server 2 determines whether or not a state to be notified to the user has occurred regarding a predetermined check item (S21), and if the state to be notified does not occur. (No in S21), other processing is executed (S22), and processing returning to step S21 is executed. On the other hand, if a state to be notified occurs (Yes in S21), information to be notified in step S23 is written in the input field, and the information stored in the input field is stored in the data storage unit 24. Executed. When the item “status” is designated, the electronic bulletin board function 2 b executes a process of displaying the accumulated “status” information on the monitor screen of the monitoring device 1.

  In such a remote monitoring system, the latest information can be obtained by browsing the information of the item that suits the purpose, and various information is posted in time series, for example, by item. Can be referred to.

  Specifically, on the electronic bulletin board, the latest maintenance status, transmission items, error information, etc. can be presented for each item on a dedicated page. Then, when the user uses the electronic bulletin board, it is possible to transmit information such as a maintenance state between users and a setting change request. Further, the information to be notified to the user by the data server 2 is stored so as to be presented on the electronic bulletin board, so that the information to be notified to the user can be notified to the user through the electronic bulletin board.

  In the tenth embodiment, the data server 2 may be configured so that only an authorized user can use the electronic bulletin board by authentication using an account and a password. The handle name of the data server 2 may be set in advance or may be set by the user. Further, notification information may be presented.

  In the tenth embodiment, the electronic bulletin board function 2b is included in the WWW server function 2a and operates under the WWW server function 2a. Software having an electronic bulletin board server function is introduced into the data server 2 and client software corresponding to the software having the server function is introduced into the monitoring device 1 so as to operate independently of the WWW server function 2a. Information may be provided from the data server 2 to the monitoring device 1 using both of these functions. However, as shown in the tenth embodiment, by operating the electronic bulletin board function 2b under the WWW server function 2a, the user interface can be unified with the general-purpose WWW browser.

(Embodiment 11)
FIG. 16 is a configuration diagram of the data server according to the eleventh embodiment of the present invention, FIG. 17 is a diagram showing a screen display example on the monitoring device by the chat function of the data server, and FIG. 18 is an operation flow diagram of the chat function.

  As shown in FIG. 16, the data server 2 of the eleventh embodiment is different from the above embodiments in that a conversation with characters is performed in real time with a plurality of monitoring devices 1 connected via the Internet L1. A chat function 2c to communicate with the monitoring device 1 through the chat function 2c, and in accordance with a predetermined chat message from the monitoring device 1, a predetermined operation, operation history display, and information display Among the processes, a corresponding process is executed.

  As shown in FIG. 16, the chat function 2c including the chat server 20c and the chat agent 21c is included in the WWW server function 2a realized by the display data storage unit 25, and operates under the WWW server function 2a. Yes. Thus, by operating the chat function 2c under the WWW server function 2a, the user interface can be unified with a general-purpose browser.

  In the WWW system constituted by the WWW server function 2a and the WWW browser function, as shown in FIG. 17, a certain URL has a chat content input field P100, a user name input field P101, and a chat content history display field P102. When the chat content is entered in the input field P100 of this page P10, the chat time entered in the input field P100 is entered on the monitor screen of each monitoring device 1 in the input time and input field P101. The displayed handle name (DSU1 in the case of the data server 2) is displayed.

  Here, as shown in FIG. 18, the data server 2 determines whether or not a chat message has been input in the input field P100 (S31). If no chat message is input (No in S31), the data server 2 The process is executed (S32), and the process returns to step S31. On the other hand, if a chat message is input (Yes in S31), it is determined whether or not the input chat message is a chat message that requests a predetermined process from the data server 2 (S33). If it is not a chat message for 2 (No in S33), the process proceeds to step S32. If it is a chat message for the data server 2 (Yes in S33), the process proceeds to step S33.

  In step S33, the content of the conversation with the data server 2 (for example, whether it corresponds to a predetermined format) is checked. If the check is NG (NG in S34), the process proceeds to step S32. If the check is OK (Yes in S34), the operation request processing (S35) for the data server 2 by the chat agent 21c, and the creation of a conversation response sentence such as “Processing of... Completed” and to the chat server 20c Is written (S36). Thereafter, the process returns to step S31.

  In such a remote monitoring system, the data server 2 can be operated in a chat format. Also, when the operation history display process is executed, it is possible to know who has performed what operation.

  The user can use the chat function 2c to exchange information with other users in a conversation format, but designates the handle name of the data server 2 as the chat partner and determines a predetermined keyword (command character string). Is input as a chat message, the data server 2 can be made to perform processing such as information display, I / O input / output operation, and setting. Further, a response message from the data server 2 to the chat message of the command character string can be confirmed in the chat message history display field P102.

  An example displayed in the chat message history display column P102 is shown in FIG. In the example shown in the figure, if a chat message is input in the format of “message” and “message> handler name of destination”, “sender> message (calling time)”, “sender> message> destination respectively. This is an example in the case where the history is displayed in the format of “handle name (transmission time)”.

  In (1), the user with the handle name “User1” enters the chat message “Turn off the power at 8 o'clock on October 16 (Thursday) for maintenance of the data server unit” without specifying the other party. It is a history display at the time of doing. In this case, the chat function 2c is configured to display the simply entered chat message in the chat message history display field P102. When the description of “> handle name of partner” is entered in the chat message and the partner is specified, the chat function 2c executes processing for analyzing the partner and the message. A message can be displayed without imposing a burden on the server 2.

  (2) is a history display when the user of the handle name “User1” inputs a chat message “STATUS?” To the data server 2 in order to cause the data server 2 to display some state. (3) is a history display indicating that a reply message “NO_ERR, STATUS_OK” is returned to the user with the handle name “User1” in response to the chat message of (2).

  (4) is a history display when the user of the handle name “User2” inputs a chat message “OWN_IP?> Data server” to the data server 2 in order to display the IP address of the data server 2. is there. (5) is a history display indicating that a reply message “192.168.1.5” is returned to the user with the handle name “User2” in response to the chat message of (4). .

  Furthermore, (6) is a history display indicating that the data server 2 has input a chat message “ALART!” To notify all users of some alarm information. In addition to alarm information, information related to errors and periodic information such as maintenance information are specified and input according to the content. As the handle name, in addition to the handle name given to one general user, “ALL” for designating all users, “admin” for designating the administrator of the data server 2 (or system), etc. is there.

  In the eleventh embodiment, the data server 2 may be configured such that the chat function can be used only by authorized users by authentication using an account and a password. The handle name of the data server 2 may be set in advance or may be set by the user.

  In the eleventh embodiment, the chat function 2c is included in the WWW server function 2a and operates under the WWW server function 2a. However, the chat function 2c may operate independently of the WWW server function 2a. In the case of this configuration, for example, the monitoring device 1 may also be provided with an independent function corresponding to the chat function, and information may be sent from the data server 2 to the monitoring device 1 through both of these functions. In this case, as shown in FIG. 19, it is determined whether or not notification information has occurred (S37). If not (No in S37), the conventional chat server processing is executed (S38), and the process goes to step S37. On the other hand, if it occurs (Yes in S37), it is sufficient to execute the process of creating a conversation sentence and writing to the chat server in Step S39.

Embodiment 12
FIG. 20 is an operation flowchart of the data server according to the twelfth embodiment of the present invention.

  In the data server 2 of the twelfth embodiment, when the monitoring device 1 is used in a remote monitoring system having an E (electronic) mail transmission function and receives a change in the condition held in the condition setting unit 22 from the monitoring device 1, The change contents are temporarily stored, and an e-mail including access permission information is transmitted to the monitoring apparatus 1 and then the data server is accessed by the WWW browser using the access permission information. It is characterized by changing conditions. The e-mail transmission destination is not limited to the monitoring device 1 that issued the change content, and a user who has confirmed the access permission information may access the data server 2 from another terminal.

  In the remote monitoring system configured as described above, the data server 2 (the main CPU thereof) receives, for example, an e-mail containing the change contents of the condition held in the condition setting unit 22 from the monitoring apparatus 1 as shown in FIG. It is determined whether or not it has been received (S41). If not received (No in S41), the process proceeds to the next operation step. If received (Yes in S41), the process proceeds to step S42. Note that the changed contents are temporarily stored in the memory in the data server 2.

In step S42, a process of transmitting an e-mail including access permission information to the monitoring apparatus 1 that has issued the change contents is executed. In the body of the e-mail, for example, the setting change is performed Change date: 2003.9.30
Click below to update changes
Http: 192.168.0.100/update.cgi? 20030930user = abcd
Information is included. Here, the Http line contains information necessary for a reply to the data server 2 and is accessed using the URL of the Http (for example, clicking on the Http line), the reply to the data server 2 is made. Is possible. That is, the mail information functions as access permission information.

  After step S42, it is determined whether or not there is an access from the user whose setting has been changed (S43). If there is an access (Yes in S43), a process of changing the condition with the temporarily stored change content in step S44 Is executed. Thereafter, the process proceeds to the next operation step.

  On the other hand, if there is no access (No in S43), it is determined whether or not a predetermined set time has elapsed since the change was received (S46). If the set time has not passed (No in S46), the process proceeds to Step S43. Returning, if the set time has elapsed (Yes in S46), in step S47, a process of discarding and invalidating the temporarily held change is executed. Thereafter, the process proceeds to the next operation step.

  In such a remote monitoring system, it is possible to prevent the conditions of the condition setting unit 22 from being rewritten by a third party. In particular, an e-mail including access permission information is transmitted from the data server 2 to a plurality of preset users, and access is made from all users who have transmitted the e-mail from the WWW system based on the access permission information. If received, if the process for changing the above condition is executed, it is possible to more suitably prevent the condition from being arbitrarily rewritten by a third party.

  In the twelfth embodiment, in addition to the process of changing the above condition, a process of transmitting an email including the change contents to a transmission destination registered in advance may be executed. In this configuration, it is possible to recognize that the changed content has been reflected in the data server 2. Further, it may be transmitted to the administrator of the data server 2 or may require approval from the administrator.

  Further, as shown in FIG. 21, after step S44, an e-mail including the change contents may be transmitted to all the monitoring apparatuses 1 registered in advance on the user side. According to this configuration, not only the changed user but also other users registered in advance can know the contents of the change.

  Furthermore, in the twelfth embodiment, when the access is received from the monitoring device 1 based on the access permission information, the condition is changed according to the temporarily stored change contents. However, as shown in FIG. When an e-mail including access permission information is transmitted to all the monitoring devices 1 on the user side (S42 ′) and access is received from all the monitoring devices 1 based on the access permission information (Yes in S43 ′), temporary You may make it change conditions with the held change content.

(Embodiment 13)
FIG. 23 is an operation flowchart of the data server according to the thirteenth embodiment of the present invention.

  The data server 2 of the thirteenth embodiment is also used in a remote monitoring system in which the monitoring device 1 has an email reception function, and after transmitting information necessary for subsequent communication to the monitoring device 1 using the email transmission function, When accessed using the information, communication by the display data storage unit 25 is allowed.

  Here, the system LS in the remote monitoring system includes a DHCP (Dynamic Host Configuration Protocol) server, and from the DHCP server every time the data server 2 starts up or whenever it tries to communicate by connecting to the Internet or the like. It is assumed that the IP address is acquired. The IP address is held by the network communication unit 21 and the condition setting unit 22.

  In the remote monitoring system configured as described above, the data server 2 determines whether or not to send an email including the IP address acquired from the DHCP server to a certain monitoring device 1 according to a predetermined condition (S51 in FIG. 23). If it is determined not to transmit (No in S51), a process of proceeding to the next operation step is executed. On the other hand, if it is determined to be transmitted (Yes in S51), a process of transmitting the E-mail to a certain monitoring device 1 is executed in Step S52. As a result, the monitoring apparatus 1 that has received the IP address by e-mail can access the data server 2 because the subsequent communication is permitted by using the IP address.

  In such a remote monitoring system, for example, by providing the monitoring device 1 and the data server 2 with an email transmission / reception function, as shown in steps S50 and S51 ′ in FIG. When an access request is received from the monitoring device 1 registered in advance by e-mail (Yes in S50, Yes in S51 '), an e-mail including the IP address acquired from the DHCP server is transmitted to the monitoring device 1. By doing so, access by a legitimate user can be facilitated, and access by a third party can be suitably prohibited.

  In addition, it is possible to prevent a problem that communication is impossible even when the IP address is not dynamically assigned from the DHCP server but is changed by the user.

  As a modified example of the thirteenth embodiment, as shown in FIG. 25, an IP address is described in the body of the email in step S52 (S52 ′), and if there is an access from outside (Yes in S53), from the outside In response to the request (S56), the process proceeds to the next operation step. If there is no access (No in S53), if within the fixed time A (No in S57), the process returns to Step S53, and if the fixed time A has elapsed. (Yes in S57), a command is transmitted to the outside (S58), and if it is within the predetermined time B (No in S59), the process returns to step S53, and if the predetermined time B has passed (Yes in S59), the next operation step is performed. You may make it go.

  To supplement the flow of FIG. 25, for example, when connecting to a provider by dial-up, if there is no communication for a certain period of time, the connection is automatically disconnected and access from the outside becomes impossible. Also, the next time the Internet is accessed, the IP address may be changed. According to the operation of FIG. 25, the Internet is accessed at a time interval shorter than the time from when an e-mail is sent to the outside (monitoring device 1) until it is automatically disconnected by dial-up or the valid time of the IP address. By continuing, it is possible to prevent the IP address from being changed or the connection from being disconnected.

  As a modification of the thirteenth embodiment, as shown in FIG. 26, an IP address and an access key are described in the body of the email in step S52 (S52 ′), and if there is an access together with the access key (S53). If 'Yes', the process proceeds to the next operation step in response to an external request (S56). If there is no access with the access key (No in S53'), the process may proceed to the next operation step.

  In the flow of FIG. 26, when an e-mail is transmitted to the outside, the IP address of the data server 2 is acquired, and the information and an access key for accessing the data server 2 are described in the body of the e-mail and transmitted. To do. Here, the term “external” refers to a terminal having an e-mail receiving function, and is not limited to the monitoring device 1. The data server 2 permits access only when there is an access with the access key. The access key may be created by appropriately combining the date, MAC address, user information, etc., but the IP address itself may be used as the access key.

  Examples 1 to 3 below are examples of the body text of an email sent from the data server 2. Example 1 is an example in which a URL including an IP address is described, and the IP address itself is an access key. An example in the case of permitting access when accessed using the URL is shown. Example 2 is an example in which a URL including an IP address and an access key “200303030” corresponding to a date of September 30, 2003 is described. Example 3 is an example in which a character string corresponding to a date is used as an access key, as in Example 2. However, unlike Example 2, an example in which access is permitted by accessing using the ftp protocol. It is shown. In any case of Examples 1 to 3, it can be accessed using a general-purpose WWW browser.

Access key example 1:
Action trigger Date: 2003.9.30
Click below to monitor the main unit
Http: 192.168.0.100/
Access key example 2:
Action trigger Date: 2003.9.30
Click below to monitor the main unit
Http: 192.168.0.100/monitor.cgi? 20030930user = abcd
Access key example 3:
Action trigger Date: 2003.9.30
Click below to monitor the main unit
ftp: 192.168.0.100/monitor.cgi? 20030930user = abcd
As a modification of the thirteenth embodiment, as shown in FIG. 27, an IP address and an access key are described in the body of the email in step S52 (S52 ′), and if there is an access together with the access key (S53). If 'Yes', the user ID and password are requested (S54). If the user ID and password are correct (Yes in S55), in response to an external request (S56), the next operation step is performed. If there is no access with the access key (No in S53 '), and if the user ID and password are not correct (No in S55), the process may proceed to the next operation step.

  In the flow of FIG. 27, when an e-mail is transmitted to the outside, the IP address of the data server 2 is acquired, and the information and an access key for accessing the data server 2 are described in the body of the e-mail and transmitted. To do. The data server 2 requests a user ID and a password only when access is made with an access key, and permits access if correct information is input.

  Further, as a modification of the thirteenth embodiment, as shown in FIG. 28, an IP address and an access key are described in the body of the email in step S52 (S52 ′), and if there is an external access (Yes in S53). In response to a request from the outside (S56), the process proceeds to the next operation step. If there is no access (No in S53), if it is within a certain time (No in S57 '), the process returns to Step S53, and a certain time has elapsed. If so (Yes in S57 ′), the process may proceed to the next operation step. In the flow of FIG. 28, after dial-up connection is performed and an e-mail is transmitted from the outside, access to the data server 2 is permitted for a certain period of time.

(Embodiment 14)
FIG. 29 is a configuration diagram of the time correction function of the data server according to the fourteenth embodiment of the present invention, and FIG. 30 is an operation flowchart of the same time correction function.

  As shown in FIG. 29, the data server 2 according to the fourteenth embodiment includes a clock unit 27 that outputs data of the current time, as shown in FIG. It has a time correction function. The time correction function is constituted by, for example, a CPU, a memory, and a program, and accesses the time server TS having an IP address such as 133.133.52.82 via the Internet L1, and sets the current time of the clock unit 27 to the correct current time. Set to the time.

  Here, in order to store data in the data server 2, it is necessary to store the data at the time when the data is sampled together with the data, and therefore a clock unit 27 that operates independently is provided. For example, when confirming the amount of power used in time series, the power amount data is periodically collected and accumulated based on the time data, and the power change data for one hour, the power change data for one day, or 1 It is necessary to summarize it as recorded data such as monthly power change data. As described above, when the data is meaningful in time series, if the current time of the clock unit 27 is deviated from the actual current time, accurate information cannot be obtained. In addition, taking the change data of the electric energy as an example, even if a countermeasure for reducing the peak value of the electric power consumption is taken, the countermeasure does not make any sense. For example, it is not possible to expect the effect of turning off the light all day in the office.

  For this reason, in the fourteenth embodiment, the time of the clock unit 27 is corrected by the time correction function. That is, as shown in FIG. 30, time data is acquired from the time server TS (S61), the time of this data is compared with the current time of the clock unit 27 (S62), and if the deviation is 1 second or more ( In step S64, a predetermined notification process is executed on the assumption that a time error has occurred in the clock unit 27 in step S64. Note that whether or not to notify the time error differs depending on the application, and therefore it is not always necessary to execute the notification process.

  On the other hand, if the deviation is less than 1 second (No in S63), in step S65, based on the data from the time server TS, the current time of the clock unit 27 is set to the actual more accurate current time (from the time server TS). A process of returning to step S61 is executed in accordance with (current time). Thereby, the time by the clock unit 27 of the data server 2 can always be set to an accurate time.

  In the fourteenth embodiment, the time of the clock unit 27 is corrected using the time server TS on the Internet L1, but the present invention is not limited to this, and as shown in FIG. A configuration in which the time of the clock unit 27 is corrected using the included radio wave may be used. In the example of FIG. 31, the current time of the clock unit 27 is corrected by the time correction function 28. The time adjustment function 28 includes an antenna unit 281a and a radio time detection unit 281b as radio wave detection units for detecting radio waves, a radio clock 281 that outputs time (radio clock time) data, and a current time from the clock unit 27. Data and time data from the radio clock 281 are input, and a comparison processing unit 282 that adjusts the current time of the clock unit 27 to the actual current time is configured.

  More specifically, as shown in FIG. 32, time data is acquired from the radio clock 281 (S61 ′), the time of this data is compared with the current time of the clock unit 27 (S62), and the deviation is 1 second. If it is above (Yes in S63), a predetermined notification process is executed in step S64, assuming that a time error has occurred in the clock unit 27. On the other hand, if the deviation is less than 1 second (No in S63), step S65 is performed. Then, based on the data from the radio timepiece 281, the current time of the clock unit 27 is adjusted to the actual current time (current time from the radio timepiece 281), and the process returns to step S 61 ′. Thereby, the time by the clock unit 27 of the data server 2 can always be set to an accurate time. The radio timepiece 281 may have an external configuration.

(Embodiment 15)
FIG. 33 is a flowchart showing the data accumulation operation by the data server according to the fifteenth embodiment of the present invention.

  The data server 2 according to the fifteenth embodiment is different from the above embodiments in that it includes a detachable and readable / writable non-volatile large-capacity memory (CF card in the fifteenth embodiment) as the data storage unit 24 and the non-volatile memory. The data is collected in the backup memory once stored in the backup memory and then stored in the backup memory. The stored data is stored in the data storage unit 24 by copying it to the nonvolatile large-capacity memory.

  Conventionally, when the collected data is stored in a CF card, SD card, smart media, etc. (hereinafter referred to as “CF card etc.”), it takes time to store the data in the CF card etc., and the power is cut off for some reason. In addition, a backup power source is provided so that power can be supplied to a circuit for storing data in the CF card or the like until the collected data is stored in the CF card or the like. However, since the backup power supply includes a large capacity battery, a large capacity capacitor, an electric double layer capacitor, etc., there is a problem that the circuit becomes large and the cost increases.

  Therefore, the data server 2 of the fifteenth embodiment has a write speed faster than, for example, a CF card, and is a readable / writable nonvolatile memory (for example, a built-in SRAM, A high-speed external memory that can be used as a cache memory) is provided as a backup memory. After the collected data is temporarily written to the backup memory, the data written to the backup memory is written to the CF card, and then written to the CF card. When the data coincides with the data written in the backup memory, writing of the collected data to the CF card or the like is completed.

  Specifically, as shown in FIG. 33, data is collected (S74), written to the backup memory (S75), and the data written to the backup memory is copied to a CF card or the like (S77). Thereafter, the data written in the CF card or the like is compared with the data written in the backup memory (S78). If both do not match (No in S79), the process returns to step S77, and if both match (S79). Yes) As the writing is completed (S81), the process of returning to step S74 is executed by, for example, the main CPU described above. Thereby, it is possible to ensure that the data collected by the input / output control unit 23 is reliably stored in the data storage unit 24.

  As a modification of the fifteenth embodiment, as shown in FIG. 34, after the power is turned on (S71), the writing flag is checked (S72). If the writing flag is off (No in S73), the data Is collected (S74), written to the backup memory (S75), then the writing flag is set (ON) (S76), and the data written to the backup memory is copied to the CF card or the like (S77). Thereafter, the writing flag is turned off (S80), the writing is completed (S81), and the process returns to step S74. On the other hand, if the writing flag is on (Yes in S73), the process may proceed to step S77.

  Also in the flow of FIG. 34, the collected data is once written in the backup memory, and the data written in the backup memory is written in the CF card or the like. When writing, a writing flag is set to notify that writing is in progress in the backup memory. When the writing to the CF card or the like is completed, the writing flag is erased. However, when the power is turned off while writing to the CF card or the like, the writing is not completed. The processing starts again from writing to the CF card or the like. According to the flow of FIG. 34, it is possible to ensure that the data collected by the input / output control unit 23 is reliably stored in the data storage unit 24 only by setting, clearing, and confirming the writing flag.

(Embodiment 16)
FIG. 35 is a diagram showing connection of a backup power source in the data server according to the sixteenth embodiment of the present invention.

  As shown in FIG. 35, the data server 2 according to the sixteenth embodiment includes a backup power source 29 connected to a data storage unit 24 composed of a readable / writable volatile memory, and measures the remaining power of the backup power source 29. This measurement function is characterized in that it is connected to the backup power source 29 only when the remaining power (voltage in the sixteenth embodiment) is measured, and the remaining power is measured based on the current from the backup power source 29.

  The backup power source 29 includes a secondary battery 291 and diodes 292, 293, and 294. On the other hand, the measurement function includes a resistance R, a switch SW interposed between the resistance R and the + terminal of the secondary battery 291, and the CPU 200 a that realizes functions such as the input / output control unit 23 and the display data generation unit 26. The A / D conversion input port P1 and a processing function including the CPU 200a, the main storage device, and a predetermined program are configured.

  The switch SW may be any switch, such as a transistor or a relay, that can be controlled on and off by the CPU 200a.

  Here, as in the present embodiment, the conventional backup power source described in the fifteenth embodiment includes a secondary battery 291 and diodes 292, 293, and 294, as shown in FIG. When the secondary battery 291 has a long-term spontaneous discharge or a long backup time, the voltage drops and cannot be backed up. Therefore, the secondary battery 291 always monitors the voltage drop of the secondary battery 291 when the main power source DC is on. There is a need. For example, the resistance R and the A / D conversion input port P1 of the CPU 200a are used for measurement of the voltage drop, and the remaining battery 291 remains based on the digital value taken from the A / D conversion input port P1. The power is measured. The resistor R has a very high resistance value in order to accurately measure the remaining power.

  In the configuration shown in FIG. 36, when the main power source DC is normal, power from the main power source DC can be supplied to the data storage unit 24 via the diodes 292 and 293. In addition, when the main power source DC is cut for some reason, the power from the secondary battery 291 can be supplied to the data storage unit 24 via the diodes 294 and 293 and the secondary battery 291 is pulled down. A current can be passed through the resistor R, and the voltage across the resistor R can be input to the A / D conversion input port P1 as a residual power measurement signal (a power drop detection signal in the figure).

  However, in the case of the configuration of FIG. 36, when the main power source DC is disconnected for some reason, the current Ir always flows from the secondary battery 291 to the resistor R, so the life of the backup power source is shortened accordingly.

  For this reason, in the sixteenth embodiment, a switch SW is provided between the resistor R and the + terminal of the secondary battery 291. With the above measurement function, for example, the switch SW is turned on only when the remaining power is periodically measured, The remaining power is measured based on the current from the backup power source 29. Thus, when the switch SW is turned off, the currents Ir and Ic shown in FIG. 36 do not flow, and the life of the backup power supply 29 can be extended accordingly.

It is a block diagram of the data server of Embodiment 1 by this invention. It is a schematic block diagram of the remote monitoring system containing the data server. It is explanatory drawing of the example of alerting | reporting by the data server of Embodiment 2 by this invention. It is explanatory drawing of the extensibility with respect to the low-order communication part of the data server of Embodiment 4 by this invention. It is explanatory drawing of the extensibility with respect to the same low-order communication part. It is a figure which shows the modification of Embodiment 4. FIG. It is a figure which shows the built-in input / output part and main CPU in the data server of Embodiment 5 by this invention. It is an operation | movement flowchart of the same data server. It is an operation | movement flowchart of the same data server. It is an operation | movement flowchart of the same data server. It is a figure which shows the example of a screen display with the monitoring apparatus by the data server of Embodiment 6 by this invention. It is a figure which shows the network communication part and main CPU in the data server of Embodiment 8 by this invention. It is a block diagram of the remote monitoring system containing the data server of Embodiment 10 by this invention. It is a figure which shows the example of a screen display with the monitoring apparatus by the electronic bulletin board function of the data server. It is an operation | movement flowchart of the electronic bulletin board function. It is a block diagram of the data server of Embodiment 11 by this invention. It is a figure which shows the example of a screen display with the monitoring apparatus by the chat function of the data server. It is an operation | movement flowchart of the chat. It is a figure which shows the modification of Embodiment 11. FIG. It is an operation | movement flowchart of the data server of Embodiment 12 by this invention. FIG. 22 is a diagram showing a modification of the twelfth embodiment. FIG. 22 is a diagram showing a modification of the twelfth embodiment. It is an operation | movement flowchart of the data server of Embodiment 13 by this invention. FIG. 40 is a diagram illustrating an example of the thirteenth embodiment. FIG. 22 is a diagram illustrating a modification of the thirteenth embodiment. FIG. 22 is a diagram illustrating a modification of the thirteenth embodiment. FIG. 22 is a diagram illustrating a modification of the thirteenth embodiment. FIG. 22 is a diagram illustrating a modification of the thirteenth embodiment. It is a block diagram of the time correction function of the data server of Embodiment 14 by this invention. It is an operation | movement flowchart of a same time correction function. It is a figure which shows the modification of Embodiment 14. FIG. It is a figure which shows the modification of Embodiment 14. FIG. It is a flowchart which shows the data storage operation | movement by the data server of Embodiment 15 by this invention. FIG. 22 is a diagram showing a modification of the fifteenth embodiment. It is a figure which shows the connection of the backup power supply in the data server of Embodiment 16 by this invention. It is a block diagram of the conventional backup power supply.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Monitoring apparatus 2 Data server 21 Network communication part 22 Condition setting part 23 Input / output control part 231 Low-order communication part 232 Bus connection input / output part 233 Built-in input / output part 24 Data storage part 25 Display data storage part 26 Display data generation part 27 Display Content storage unit 28 Display program storage unit 29 External notification unit 30 Data file transfer unit 3 Connection device 4 Conversion adapter

Claims (23)

A data server connected to a monitoring device via a host communication network and providing the collected data to the monitoring device,
A condition setting section for storing data accumulation conditions;
An input / output control unit that includes a bus connected to the bus connection input / output device and collects data according to the accumulation condition held in the condition setting unit;
A data storage unit for storing data collected by the input / output control unit;
A network communication unit connected to the upper communication line side and communicating according to a predetermined protocol;
A display data generation unit that generates display data to be displayed on the monitoring device, based on data stored in the data storage unit;
And a display data storage unit having a server function for providing display data generated by the display data generation unit.   2. The data server according to claim 1, wherein a built-in input / output unit connected to the device under test and taking in data is provided in the input / output control unit.   The data server according to claim 1, wherein a lower-level communication unit that communicates with a device having a serial communication interface is provided in the input / output control unit.   The data server according to claim 1, wherein the bus connection input / output device is an extension unit connected to a bus of a programmable controller.   4. The data server according to claim 3, wherein the lower communication unit is configured to be exchangeable.   4. The data server according to claim 3, wherein the communication program of the lower communication unit is stored in a rewritable nonvolatile memory.   The data stored in the data storage unit is monitored, and when it is detected that the data is in a predetermined state, data is sent to the network communication unit or the input / output control unit according to the notification condition held in the condition setting unit. The data server according to claim 1, further comprising an external notification unit that outputs a notification signal that indicates that the state of the device is in a predetermined state.   Control that monitors data stored in the data storage unit, and controls the external device to the input / output control unit according to the control condition held in the condition setting unit when it is detected that the data is in a predetermined state 4. The data server according to claim 1, further comprising an external notification unit that outputs a signal or data.   The external notification unit has an e-mail transmission function, monitors data stored in the data storage unit, and detects an e-mail address stored in the condition setting unit when it is detected that the data is in a predetermined state 9. The data server according to claim 7, wherein an e-mail notifying that is transmitted to the address.   The external notification unit has a function of calling a telephone terminal, monitors the data stored in the data storage unit, and stores the data in the condition setting unit when detecting that the data is in a predetermined state. 9. The data server according to claim 7, wherein a telephone terminal having a telephone number is called.   3. The data server according to claim 2, wherein the built-in input / output unit includes a dedicated CPU that detects a pulse edge of the input pulse signal and interrupts the main CPU of the data server.   The data server according to claim 1, wherein the monitoring device includes a general-purpose WWW browser, and the display data generation unit generates display data in HTML format in response to a request from the general-purpose WWW browser.   A display program storage unit for storing data transmitted to the monitoring device and stored in the data storage unit via the display data storage unit and storing a display program to be displayed on the monitoring device is provided. The data server according to claim 12.   The display program stored in the display program storage unit is a JAVA (R) applet including information on the IP address of the data server. After being transmitted to the monitoring device, the IP address of the data server is changed. 13. The data server according to claim 12, wherein the data server is configured to detect this and change the IP address held by the IP address to the changed IP address.   The network communication unit includes a dedicated CPU for determining whether the packet is addressed to a data server and transferring only the packet addressed to the data server to a main CPU of the data server. Data server.   The data storage unit is provided with a buffer area having a plurality of areas corresponding to various types of data having different capture timings and capture cycles and holding the latest data collected from the connection device, and the latest data collected from the connection device. The data is stored and updated in the corresponding area of the buffer area individually at the time of each capture corresponding to the type of the data, and when the latest data is requested from the monitoring device, the buffer The data server according to claim 1, wherein the data held in the area is transmitted to the monitoring device.   The data server according to claim 1, wherein the display data storage unit has an electronic bulletin board function for displaying maintenance information and the like that can be written by an administrator of the data server or a user of the monitoring device.   The display data storage unit allows the user of the monitoring device to display on the monitoring device a command input screen for inputting a command to the data server and a response screen for displaying a response to the command, or a command The data server according to claim 1, wherein the data server has a function of executing processing corresponding to.   When the external notification unit has an e-mail transmission function and receives a request to rewrite information held in the condition setting unit of the data server from a user of the monitoring device, an e-mail describing the fact The information stored in the condition setting unit is rewritten when a user of the monitoring device accesses the data server based on information described in an e-mail. 8. The data server according to 8.   The external notification unit has an e-mail transmission function, transmits an e-mail describing information necessary for communication with the data server, and a user of the monitoring device based on the information described in the e-mail 9. The data server according to claim 7, wherein communication is permitted when the data server is accessed.   The data server according to claim 1, wherein the time of a clock unit that communicates with a time server via the upper communication line and outputs time information is corrected.   The detachable and rewritable nonvolatile large-capacity memory is provided, and the data storage unit is configured by a memory backed up by a backup power source that can be rewritten at a higher speed than the large-capacity memory, and is stored in the memory. 2. The data server according to claim 1, wherein the data is copied to the large-capacity memory.   The data storage unit includes a memory backed up by a backup power source, and a circuit for measuring the remaining power of the backup power source is connected to the backup power source only when the remaining power is measured. 1. The data server according to 1.

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