JPH1124730A - Monitoring system by separate access system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To monitor and control various equipment over a wide area while eliminating a field board and to facilitate speedy and proper correspondence even under severe conditions. SOLUTION: In the monitoring system which displays information gathered by plural monitor controllers on terminal information monitor controllers, each monitor controller 11 is equipped with a base station 11a for transmitting and receiving information with radio waves and terminal information monitor controllers 12-1-2-3 are each equipped with a portable information terminal which monitors and controls the state of plant equipment and a portable station which transmits and receives information by a radio device controlling multichannel access control and access and paging by different channels. The radio device which transmits and receives information from the portable station to the base station is provided with a method which judges a transmission time zone, line establishment between radio devices, and whether or not the line between terminals is normal from codes and performs continuous transmission to channels characteristic of previously allocated portable stations and a function which provides a pause in every cycle through time management.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a monitoring system based on a separate access system provided with an information terminal operating device for monitoring the state of equipment operating in a plant and instructing an operation direction near the equipment.

[0002]

2. Description of the Related Art In a conventional water and sewage monitoring plant, for example, several monitoring and control devices are connected via a network such as a LAN with a central monitoring device as a core. Each of these monitoring and control devices collects information on equipment related to a series of operations, for example, information on water level, valve opening, pump rotation speed, etc., and collectively displays the information on a terminal information monitoring and control device (on-site panel). ing.

FIG. 18 shows an example of the configuration of such a monitoring and control system. In FIG. 18, 1 is a personal computer 2
Central control and monitoring device with 3
Is a CPU and 5 is a telemeter device, each of which is L
It is connected to AN6.

On the other hand, reference numeral 7 denotes a plurality of monitoring and control units connected directly to the optical fiber cable connected to the LAN 6 via the photoelectric conversion unit and via the LAN 8, and each of the monitoring and control units 7 includes a relay board. 9 are connected to each other, and a plurality of field boards 10 are connected to each other through the relay board 9.

[0005] In the monitoring and control system having such a configuration, maintenance and inspection of various devices are performed on the site panel 10 which is an input unit by a maintenance person on the monitoring and control device.

[0006]

However, maintenance and inspection of the equipment by the on-site worker requires a great deal of time and labor, and the on-site panel uses a casing, so that There were problems such as the environment resistance in the place where the wind hits, the lack of room in the building, and the need for troublesome cable wiring.

Therefore, recently, it has been attempted to wirelessly transmit information between the terminal information monitoring and control device and the field panel. Wireless is the most developed part of the telecommunications line, and the concept has existed for over a decade, but due to cost and technical constraints, and because of the need for special applications, relative It is currently adopted only for those limited to

[0008] The biggest reason is that no public market was found. Recently, the wireless technology has changed, especially the cellular system has changed,
The most notable wireless technology is that it allows for true human-to-human communication rather than station-to-station. In this regard, progress has been made not only in cellular communications but also in circuit connections.
Traditional networks allow users to take in a variety of information at any time, anytime, anywhere.

Therefore, by performing monitoring and control by radio,
Until now, the terminal information monitoring and control device, which was a permanent type, can be removed, and the space can be reduced. In addition, since information from the monitoring control device is transferred to the portable information terminal by transmission, desired information can be arbitrarily captured.

In this case, a frequency band in which multi-channel access control is possible is used as a radio frequency.
Such a radio is a frequency that can be used by anyone if licensed, but the frequency that can be used is fixed, and in that sense it can be said that it is a finite resource.

In order to monitor and control a monitoring target wirelessly, a base station is provided in the monitoring control device, and a mobile station for exchanging information with the base station wirelessly is provided. A monitoring and control apparatus using a specific low-power wireless device that monitors the monitoring target and operates on the monitoring target is known.

However, in the monitoring and control apparatus having such a configuration, when the portability is considered, both the base station and the mobile station have a low antenna height of 1 m or less, and are greatly affected by obstacles such as buildings, trees, and terrain undulations. . In this case, the effects of the electric field strength are various, and it is difficult to apply the propagation theory such as the plane ground calculation method and the spherical analysis theory that are commonly used. Must use experimental data.

When information is transmitted by radio waves, the error rate indicating the number of bits at which an error occurs is represented by [1 time / bit], but in the case of a conventional order of 10 ^-9 or less. ,
It has been unsuitable for supervisory control. In general, in radio, since the order is 10 ^-4 when the reception input level is 20 [20 dBV], there is a problem that the order is far apart and the propagation speed is as slow as 2400 bps.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems. It is possible to monitor and control various devices over a wide area without a site panel, and to quickly and appropriately respond even under severe conditions. It is an object of the present invention to provide a surveillance system using a separate access method that can be easily implemented.

[0015]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a monitoring system using the following separate access system. The invention according to claim 1 is characterized in that a plurality of supervisory control devices for collecting and controlling equipment status information related to a series of operations of a plant are connected to a central supervisory device via an information network, and the supervisory control is performed. In a monitoring system that displays information collected by a device on a terminal information monitoring and control device, each of the monitoring and control devices includes a base station that transmits and receives information by radio waves, and the terminal information monitoring and control device operates the equipment of the plant. A portable information terminal for monitoring and controlling the state; and a portable station for transmitting and receiving information with a radio device for controlling multi-channel access control and access and paging on different channels, and transmitting and receiving information from the portable station to a base station. The transmission time zone, the establishment of a line between the radios, and whether the line between the terminals is normal is determined by a code, The pause to a predetermined cycle by the method and time management for transmitting strip-station-specific channel and continuously in which have a function of signal transduction.

In the monitoring system based on the separated access system having the above-mentioned configuration, the frequency in the plant operated by fixing the access and paging channels assigned to each terminal information monitoring and control device is fixed. By preventing the occurrence of interfering waves due to intermodulation between used channels and allocating codes to each base station and mobile station, communication is not performed between wireless devices other than the intended one.

According to a second aspect of the present invention, in the monitoring system using the separate access method according to the first aspect of the present invention, a base station having a group configuration for each control purpose is provided in the plant, and the mobile station is provided within the group. In this case, a group broadcast communication system in which a high-priority call can be set only to a specific target base station without affecting other base stations is adopted.

In the monitoring system based on the separated access system having the above-described configuration, the operator communicates with the base station receiving the strongest radio wave intensity at any position, so that the radio wave intensity is less than a certain level. When this happens, it is possible to prompt the operator to do so, and if communication becomes impossible due to radio wave strength deterioration, reconnect the line and move again by connecting to the base station that was most strongly connected. Can be managed.

According to a third aspect of the present invention, in the monitoring system using the separate access method according to the first aspect of the present invention, the monitoring control device at the connection destination of each base station determines which channel is to be set when the mobile station requests a line establishment. The base station checks whether the signal has been received at the highest reception level, and instructs the base station that has received the strongest signal to connect to the mobile station.

In the monitoring system according to the separate access method having the above-described configuration, a line is established for a monitoring control device that manages information desired by an operator, and control data is stored in advance in the terminal information monitoring control device. In this way, the supervisory control device can perform incoming call management such as receiving and replying only to the code transmitted from the terminal information supervisory control device.

[0021]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram showing an embodiment of an entire monitoring system using a separate access method according to the present invention. Here, a case where the present invention is applied to a water supply and sewage monitoring control system will be described.

In FIG. 1 (a), reference numeral 11 denotes a supervisory control unit for a plurality of facilities (corresponding to each electric room), which is connected to the central supervisory control unit 1 and the CPU 4 via the LAN 6 and controls the state of each function of the plant. In this monitoring control device 11
Is provided with a plurality of base stations 11a corresponding to the first system and the second system. Each of these base stations 11a has a common transceiver 1-1, 1-2, a wired distributor 1-3, an interrupt transceiver 1-4, a regular transceiver 1-5, a wired distributor 1-5. 6 are distributed and installed at an appropriate distance.

Reference numerals 12-1, 12-2, and 12-3 denote wireless terminal information monitoring and control devices. These terminal information monitoring and control devices 12-1, 12-2, and 12-3 are arranged as shown in FIG. A wireless portable station is constituted by a portable information terminal 12a for an operator to monitor and control the operating state of the system and a transceiver 12b by radio waves.

Here, each base station 11a comprises a radio 11a-1 and a distributor 11a-2 as shown in FIG.
Controller 1-1 of system 1 and system 2 of monitoring control device 11
, Respectively. In this case, the controller 11-1 includes, as shown in FIG. 1B, information transmitting / receiving units 1-7,
1-8 and a distributor 1-9 via a cable, and has a function of monitoring and controlling each field device. In addition, at the site of the facility A, information transmitting / receiving units 1-A and 1-B and a distributor 1-C for base station backup are provided corresponding to the site devices.

These terminal information monitoring and control devices 12-1, 1
The portable information terminals 12a of 2-2 and 12-3 have a function of requesting and displaying the following data to the supervisory control device 11 which is an upper layer of the system.

(1) Name of equipment of system (2) Name of equipment driven in system (3) Operation / failure state of equipment driven in system (4) Equipment driven in system Also, the following operation is performed on the host monitoring and control device 11.

(A) State (mode) switching operation of equipment driven in the system (b) Input of set values of equipment driven in the system Screen of portable information terminal 12a satisfying the above functions The configuration is performed by a processing procedure as shown in FIG. FIG.
First, for example, a site operation is selected from a menu to display a facility selection screen, and then, for example, a raw water facility is selected from the facility selection screen.

Next, a device selection or a mode selection is designated, and in the case of a device selection, any one of a device state or a device operation is selected. In the case of device selection, select either device status or device operation, and in the case of device operation selection, device ON / OF
F, any one of continuous operation and set value change is performed. In the case of mode selection, mode switching is performed.

When there is a failure in the equipment state in the above equipment selection, a failure display is displayed according to the degree. Thus, in the plant system,
The monitoring control device 11 is installed for each unit of equipment, and the equipment is further divided into smaller blocks (equivalent to a site panel). In one site panel, the name of the device and its state, or the name of the device and the analog data value, as well as the name of the mode and its state are displayed. In addition, failure status, emergency stop,
It includes functions such as a command button for alarms such as a recovery from a failure, a column indicating a wireless line state, and the like. The specific contents of the failure state are developed by touching the area.

Here, the screen indicating which equipment information one wants to acquire has, for example, the contents as shown in FIG. In this equipment menu, when the operator selects equipment, the mobile information terminal 12a causes the mobile station to execute carrier sense. With this, the station opening operation with the connected base station is performed,
Thereafter, the connection between the mobile station and the base station is 1: 1.

In the portable information terminal 12a, the state display area also serves as an input switching button for effective use of the screen. For example, in the mode switching as shown in FIG. 6, a screen for setting a mode such as “site / center” and “interlocking / independent” is set. Mode.

Further, development on other screens can be performed by touching the display area. For example, in the mode switching menu shown in FIG. 7, when a device area is selected, a device operation menu appears.

Next, radio resource management, mobility management, incoming call management, and data management performed in four groups will be described as network functions of the present system.・ Radio resource management Using multi-channel access control technology for radio equipment, access (mobile transmission) and paging (mobile termination) are controlled on different channels.

For example, a continuous wave of a specific low-power radio is used for access to the portable station 12a, and an intermittent wave of the specific low-power radio is used for paging. In this case, the base station uses an intermittent wave of the specific low-power radio for access and a continuous wave of the specific low-power radio for paging.

The continuous wave of the specified low-power radio can use 40 continuous waves and the intermittent wave can use 10 waves, and the paging uses a multi-channel access technique. Among these, when an operator having a plurality of mobile stations simultaneously communicates in the area where the wireless base station is installed, intermodulation does not occur in advance in order to prevent interference due to intermodulation between used channels. Wireless management by the mobile side, which registers a specific channel on the mobile station side and selects startup, is adopted.

As for the time zone, once a continuous wave is established, the continuous wave is constant until the connection destination is changed or the line is disconnected due to a communication failure. When transmitting the intermittent wave for 40 seconds or more, it is necessary to provide a pause of 2 seconds and restart the operation.

The code uses the establishment of a line between the wireless devices and the determination as to whether the line between the terminals is properly bound. For frequency allocation, different frequencies are used for transmission and reception, and channels fixed to mobile stations are allocated so that the same frequency does not rise in the system.

For the signal transmission, two patterns are provided in which a pause is provided at regular intervals by a method of continuous transmission and time management. When the power supply voltage drops below a certain level, the mobile station transmits a control signal “battery low” to the mobile information terminal to prevent sudden interruption of communication due to a drop in the power supply voltage of the wireless device. A warning announcement is sent to the site maintenance staff via the display screen.

Further, even when a transmission error occurs, the portable information terminal constantly checks data so that radio waves are not unnecessarily transmitted for a long time.・ Movement management In the case of mobility management that demands the ability to follow various movements and high quality, a plurality of base stations are provided in the plant so that the operator can obtain the desired information in the desired area.

In the present embodiment, within a limited area (plant) where base stations are located, information can be input quickly, and a portable information terminal capable of obtaining a quick processing result and a monitor installed in the plant are provided. The transmission between the control devices is wireless.

The base station has a group configuration for each control purpose, and the portable station executes group broadcast. The mobile station adopts a group broadcast communication system that can set a high priority call only to a specific target base station without affecting other base stations in the group.

The supervisory control device keeps track of which of the base stations under its control is currently in communication, and restricts the number of base stations with which communication is possible, so that more than a certain number of operators can communicate with the base station. We do not accept the opening of the station. As a result, even if the current base station becomes a communication load due to the movement of the operator, it is possible to respond to the operator at another vacant base station.

When the reception level falls below a certain level due to the movement of the operator, the mobile station transmits a control signal “reception level decrease” to the mobile information terminal, and issues a warning announcement to the field maintenance staff through the display screen of the mobile information terminal. In addition, when the communication load is caused and the line is disconnected, the connection with the base station having the highest reception level can be restored. -Incoming call management Connection is made only to the system within the plant desired by the operator, thereby reducing connection irrationality contrary to the operator's will.

Using the control data formatted on the basis of the protocol, each mobile station and base station performs a loading process if the control data contains its own unique number.

The monitoring control device at the connection destination of each base station checks which base station received the highest reception level when a line establishment request was received from the mobile station. The supervisory control device instructs a connection with the mobile station.

When the line is established, the supervisory control device controls the equipment connected to itself based on the control contents transmitted from the portable station. The control data includes various device codes, and control is performed only when the codes match the codes stored in the code storage means of the monitoring control device in advance, thereby improving safety.

The data from the operator is continuously transmitted so that even if one data is lost, it can be picked up by another data. Also, since the data from the equipment is large,
Packets are transmitted with meaningful data divided into small pieces.・ Data management In the data management for information style system management, data storage, restoration, renewal, maintenance, etc., the following processing is performed to solve the difficulties of specific low power radio with high error rate.

1) Transmit short data continuously. 2) Prepare many base stations. 3) Shortening of dialogue by transmission without confirmation of normal (ACK) and abnormal (NAK) line status, and other possible measures 4) A structure in which a plurality of base stations can simultaneously access one mobile station, A system in which only correct data is adopted by the monitoring and control device. In addition, a data mobile station is controlled from the monitoring control device to the mobile station in a self-divided manner, so that the system can easily receive data even when the mobile station moves.

Transmission is performed as needed, and the state of the device is refreshed at regular intervals, and the state of the device is constantly monitored. The information that the portable information terminal acquires from the monitoring control device is constant for each screen. Information from the portable information terminal is periodically performed, and this also performs a function of checking whether a transmission path is secured. When an operation input occurs, it can be represented by, for example, three basic patterns according to the transmission path of the operation.

1) When there is no human power: The monitoring control device transmits the current value data collected from each device. 2) When changing the operation state of the device: the monitoring control device gives a control command to each device. The monitoring control device transmits the current value data to the portable information terminal.

3) When changing the monitoring state of the device: The current value data is transmitted to the portable information terminal with the virtual result.
Further, both the mobile station and the base station have unique numbers. This number is a group number indicating a group and a unique number indicating an individual number. By sorting radio devices according to this numbering plan, it is possible to distinguish between a device not addressed to one's own number and a device addressed to one's own. Supplies trust, prestige, and confidentiality as a communication ability. A plane numbering plan to be assigned to a geographical location can be established by a network having this numbering plan.

Next, the operation in the case where the monitoring system using the separated access system configured as described above is applied to a water and sewage monitoring system will be described. In the embodiment of the present invention, radio resource management will be described first.

The maximum number of terminal information monitoring and control devices that can be used in one plant is eight when used wirelessly. Here, the transmission frequency of the mobile station is assigned to eight continuous waves without tertiary intermodulation among 40 continuous waves. In the case of 40 waves, (1, 2, 5, 10, 16, 23, 33, 3)
5) satisfies this condition. The next pattern is (2, 6, 11, 17, 24, 34, 36). Up to six patterns satisfying such conditions can be realized. Choose the best pattern.

The frequency assignment of the mobile station is set by a table, and the base station has a multi-channel receiver structure having eight stations in the above pattern. On the other hand, base station transmission frequency allocation allocates eight out of ten intermittent waves.
The base station can prevent third-order intermodulation by setting a sufficient installation interval. Also, the frequency allocation of the base station is set by a table similarly to the mobile station. The mobile station has this 8
It has a multi-channel receiver structure with stations. Furthermore, since intermittent waves cannot be continuously transmitted for 40 seconds or more,
The base station transmitting side performs transmission while performing time management as shown in FIG.

That is, in FIG. 8, when the time management routine starts, a loop that rotates within 40 seconds is formed.
After receiving data, analyzing data, and giving commands to the monitoring and control unit, it is determined whether or not it is within 40 seconds. If it is within 40 seconds, data is transmitted, and a loop that rotates within 40 seconds is formed. Then, the wireless pause is performed, and if it is not within 40 seconds, the wireless pause operation is performed and the process ends.

In the present embodiment, a method of giving a unique frequency to the mobile station on the terminal information monitoring and control device side is employed.
Therefore, when a wireless communication failure occurs, it is possible to easily determine at which frequency the disturbance is occurring.
When a failure frequently occurs at its own frequency, the terminal information monitoring and control device uses the subchannels allocated to the table.

The frequencies on the transmitting side and the receiving side correspond to 1: 1. In this system, the mobile station becomes a primary station and performs a station opening operation on the base station. When a base station is instructed to open the base station, the base station corresponds to the frequency of the mobile station. Responds as to whether or not the station can be opened at the station frequency.

The error rate of the radio varies depending on the reception strength. When the power supply voltage of the terminal information monitoring and control device decreases, the reliability of transmission data decreases. For this reason, when the power supply voltage reaches a certain level, an announcement of “battery low” is issued. Furthermore, the terminal information monitoring and control device also checks the reception level, and in this case also, when the reception level falls below a certain level, announces “reception level decrease”.

Further, even when a transmission error occurs, the portable information terminal constantly checks data so that radio waves are not transmitted unnecessarily for a long time. Therefore, when data is received in an abnormal state, the fact that retry is being performed is displayed on the screen, and when abnormal data is received more than the set number of times, the line is disconnected. As a result, radio interference with other communication stations during communication is prevented, and reliability is improved.

Next, movement management will be described. In the present embodiment, a configuration is adopted in which a plurality of base stations are provided in a plant, and an operator having a portable information terminal device has the most of the base stations connected to the monitoring control device that manages the information desired. Perform line connection with a base station with a strong reception level. Base stations connected to the same supervisory control device form the same group, and the operator performs group broadcast to the supervisory control device belonging to the device to be monitored.

The mobile station adopts a group broadcast system in which a high priority call can be set only to a specific target base station without affecting other base stations in the group. . This operation is performed by performing carrier squelch from the wireless mobile station to the base station.

The carrier squelch possessed by the base station has three levels: communication is sufficiently possible (reception level is 20 dBμ or less), and communication is not possible (no reception level).
FIG. 9 is a block diagram for explaining the procedure for opening a station, and the procedure for opening the station will be described step by step.

1) From the portable information terminal device to the wireless portable station 12
b. 2) The mobile station 12b is a monitoring control device 11 to be operated.
Carrier squelch is performed on base stations 11a belonging to the same group belonging to the same group.

3) The base station 11a transmits an output of “sufficiently communicable, communicable, communicable” to the supervisory controller 11 according to the reception level. If communication is not possible, the monitoring and control device 11 makes a determination based on a timeout.

4) The supervisory control device 11 receives the output from the base station 11a and determines the base station with which to communicate. -Set the channel for the base station that performs communication.

For other base stations, enter the channel search state (MCA mode). By performing the station opening operation according to such a procedure, the supervisory control device 11 keeps track of which of the base stations 11a under its control is currently communicating. In addition, the monitoring control device 11 does not accept the opening of the station from a certain number or more of operators by limiting the number of base stations 11a with which communication is possible.

Thus, when the reception level becomes constant due to the movement of the operator, the mobile station 12b sets the mobile information terminal 1
A control signal “reception level decrease” is transmitted to 2a, and a warning announcement is made to the site maintenance staff through the display screen of the portable information terminal 12a. Also, when communication becomes impossible and the line is disconnected, connection with the base station having the highest reception level can be restored.

Next, incoming call management will be described. The connection is made only to the system in the plant desired by the operator, thereby reducing connection irrationality contrary to the operator's will.

When the line is established, the mobile station repeatedly sends a command prompting the base station in the MAC mode to open the station many times. The base station monitors the assigned 8CH pattern as needed. Assuming that the start command from the mobile station is 8 ms and the time during which the base station stops at 1CH is 300 ms,
The base station rotates 300 ms × 8 = 2.4 s per round. Therefore, at least 2.4 seconds are required for the mobile station to continue transmitting while the base station goes around the channel.

If the base station can receive the opening command even once, the line is established. However, the number of times that the base station receives the opening command while stopping on 1CH is two or three. May be increased by increasing the number of station opening commands from the mobile station or by increasing the time during which the base station stays in 1CH.

In the present embodiment, the base station / mobile station ID NO. Is added to transmit text data. As shown in FIG. 10, both the mobile station and the base station receive IDNO. Is checked and IDNO. Do not accept. Then, the base station / mobile station sends IDNO. And then pass the data.

Each mobile station or base station performs an import process when its own unique number is contained in the control data formatted based on the protocol. The supervisory control device connected to each base station checks which base station received the highest reception level when a line establishment request was received from the mobile station, and performed supervisory control on the base station that received the strongest reception. The device instructs to make a connection with the mobile station.

When the line is established, the monitoring control device controls the equipment connected to itself based on the control content transmitted from the portable station. The control data includes various device codes, and control is performed only when the codes match codes stored in advance in the code storage unit of the monitoring control device. Therefore, safety can be improved.

FIG. 11 shows details of the text data. The data from the operator side can be picked up by other data even if one data is missing by associating.
In this case, since there is a large amount of data from the equipment side, pallet transmission is performed by finely dividing each meaningful data.

At the time of transmission, the text data is subdivided into data of 10 to 30 bytes, so that even if a part of the data is lost or changed, it does not affect the entire text data. That is, if the data 2 and subsequent data are normal even if the data 1 has a BCC error, the data after data 2 is adopted,
The abnormal part adopts the method of adopting the previous value.

Finally, data management will be described. FIG.
Shows the structure of reply data to the request between the portable information terminal and the monitoring control device. The configuration of the transmission shown in FIG. 12 is roughly divided into when the station is opened and other cases. The configuration of the reply text is different for each of the list data request and the detailed data request.

The information obtained by the portable information terminal from the monitoring control device is always constant for each screen. Information from the portable information terminal is performed at regular intervals, and this also serves to check whether a transmission line is secured. When an operation input occurs, it is represented by, for example, three basic patterns as shown in FIG. 13 according to the transmission path of the operation.

1) When there is no input: The monitoring control device transmits the current value data drawn from each device. 2) When changing the operation state of the device: the monitoring control device gives a control command to each device. The monitoring control device transmits the current location data to the portable information terminal.

3) When changing the monitoring state of the device: The current value data is transmitted to the portable information terminal with the virtual result. For each piece of information, the data received by the portable information terminal is constant for each screen. The supervisory control device manages the information of the devices on a group basis, collects data necessary for the code transmitted from the portable information terminal, and transmits the data to the portable information terminal.

The data transmission at the normal time employs a method in which the portable information terminal periodically prompts the supervisory control device to transmit the data.
If no input is made by the operator, a request for the current value is sent from the portable information terminal if an input is made.

If there is a process for the device, the monitoring control device transmits the current value data after executing the process.
As described above, the following processing is performed on the transmission. 1) Send short data continuously.

2) Prepare many base stations. 3) Shortening of dialogue by transmission without confirmation of normal (ACK) and abnormal (NAK) line status As another measure, a structure is adopted in which a plurality of base stations can access one mobile station at the same time, and monitoring control The system adopts only correct data in the device. Further, regarding the data from the monitoring control device to the mobile station, the mobile station is controlled in a self-divided manner so that the system can easily receive data even when the mobile station moves. The transmission is performed as needed, and the state of the device is refreshed at regular intervals, and the state of the device is constantly monitored.

As shown in FIG. 14, ACK, NAK
In order to shorten the control method, the input terminal prepares two types of requests: a refresh request when there is no input, and an operation request when there is an operation, and the information from the monitoring control device (base station) side always uses the current value information. Shall be sent.

Normally, the confirmation of the line state performed between the wireless modems is omitted, and the line state is confirmed.
Rather than requesting the current data only when replying), the current data is directly requested, and the normal current value data is received as a reply to confirm the normality of the line, thereby shortening the data communication. .

Although the error rate of wireless data communication is usually higher than that of wired data communication, it is greatly affected by fluctuations in the reception level due to movement. Therefore, by continuously transmitting short data, the quality of data is reduced. Must be secured. FIG. 15 shows a case where information is transmitted three times from the input terminal to the monitoring control device.

Further, since the data from the monitoring control device to the input terminal has a large text length, the data is partially fragmented and transmitted as shown in FIG. The subdivided text is STX ~
Separated by BCC.

The portable information terminal counts the number of STXs up to the CR, and if the number is normal, adopts it as data. No message part in fragmented text, BCC error,
If there is no ETX, the text is not adopted and the following measures are taken.

Current value data: Previous value display Line error analysis: Blank display Also, no retransmission request is made for no message part, no BCC error, no ETX, and an error for line error analysis has occurred. Count only the number of times.

There are two types of formats from the portable side: 1) text for requesting information on the current value, and 2) text for controlling equipment. The former is transmitted when there is no input.

That is, as shown in FIG. 17, the text requesting the information of the current value checks the status of the line connection along with the data request. This text is transmitted periodically according to the screen when there is no operation input.

The text for controlling the latter device transmits a corresponding command when an operation input occurs. Up to three texts are transmitted at the same time so that even if another input is made before the next transmission timing, up to three texts can be handled.

To cope with this, the portable information terminal stores transmission data in a buffer once and transmits it at a timing. When the number of data stored in the buffer is up to three texts, the portable information terminal confirms the normal reception of data from the monitoring control device and deletes the transmission text in the buffer.

However, a different site board NO. No operation input is performed, and the supervisory control device indicates that the site number NO. Send the current value data of As described above, in the above-described embodiment, each of the monitoring control devices includes the base station that transmits and receives information by radio waves, and the terminal information monitoring control device includes a portable information terminal that monitors and controls the operation state of the equipment in the plant. And a mobile station that transmits and receives information with a wireless device that controls access and paging on different channels. A wireless device that transmits and receives information from the mobile station to the base station has a transmission time zone and a line between the wireless devices. A code is used to determine whether the establishment and the line between terminals are normal,
A function of transmitting a signal by providing a pause every predetermined period is provided by a pre-assigned channel specific to a mobile station, a continuous transmission method, and time management.
Therefore, the frequency in the plant operated by fixing the access and paging channels assigned to each terminal information monitoring and control device is managed, and the generation of interfering waves due to intermodulation between the used channels is performed. Prevention and assignment of a code to each base station and mobile station prevent communication from being performed by a wireless organization other than the intended one. In addition, since the intermittent wave is used for one of the waves, management is performed such that a pause of 2 seconds is performed every 40 seconds. Furthermore, for battery drive,
When the power supply voltage of the battery drops, a stable system having a function of issuing an announcement can be realized.

A base station in a group configuration is provided in the plant for each control purpose, and the mobile station can control the other specific base station without affecting other base stations in the group. Only the high-priority call can be set using the group broadcast communication method, so that the operator can communicate with the base station that received the strongest signal strength regardless of the position, regardless of the position. Becomes smaller than a certain value, it is possible to prompt the operator to do so.If communication becomes impossible due to radio wave strength deterioration, the line connection is made again, and the base station with the strongest connection is reconnected. This makes it possible to manage the movement.

Further, the supervisory control device connected to each base station checks which base station received the strongest reception level when a line establishment request was received from the mobile station, and determined the base station that received the strongest. To establish a connection with the mobile station, the operator establishes a line with the monitoring control device that manages the information desired by the operator, and further stores control data in the terminal information monitoring control device in advance. By leaving
The supervisory control device can perform incoming call management such as receiving and replying only to the code sent from the terminal information supervisory control device.

Further, information style system management,
By storing, restoring, renewing, and maintaining data, it is possible to perform data management for solving the difficulties of the specific low-power radio having a high error rate.

As described above, by performing the monitoring and control by radio, the terminal information monitoring and control device, which has conventionally been of a permanent type, can be omitted, so that the space can be saved and the monitoring and control device can be used. Is transmitted to the portable information terminal by transmission, so that desired information can be arbitrarily captured.

[0098]

As described above, according to the present invention, it is possible to monitor and control various devices over a wide area without a site panel, and to easily perform quick and appropriate response even under severe conditions. A monitoring system according to the method can be provided.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an embodiment of an entire monitoring system using a separate access method according to the present invention.

FIG. 2 is a block diagram showing an internal configuration of the terminal information monitoring and control device according to the embodiment;

FIG. 3 is a block diagram showing an internal configuration of a base station and a supervisory control device in the embodiment.

FIG. 4 is an exemplary view showing a processing procedure of a screen configuration of the portable information terminal in the embodiment.

FIG. 5 is a display screen diagram showing a facility menu in the embodiment.

FIG. 6 is a display screen diagram showing a mode switching menu in the embodiment.

FIG. 7 is a display screen diagram showing a device operation menu when a device area is selected from a mode switching menu in the embodiment.

FIG. 8 is a flowchart of time management performed on the base station transmitting side in the embodiment.

FIG. 9 is a block diagram for explaining a station opening operation procedure in the embodiment.

FIG. 10 is a configuration diagram showing a delivery check state of text data transmitted between a base station and a mobile station in the embodiment.

FIG. 11 is a diagram showing details of text data.

FIG. 12 is a configuration diagram of return data in response to a request between the configuration information terminal and the monitoring control device in the embodiment.

FIG. 13 is a diagram showing a basic pattern of a transmission path at the time of operation input in the embodiment.

FIG. 14 is a diagram showing a data transmission state according to a normal or abnormal line state from the portable information terminal in the embodiment.

FIG. 15 is a diagram showing a case where information is transmitted three times from the input terminal to the monitoring control device in the embodiment.

FIG. 16 is a diagram showing a state in which text data is fragmented and transmitted from the monitoring control device to the input terminal in the embodiment.

FIG. 17 is a diagram showing text data for checking whether a line connection is possible or not together with a data request in the embodiment.

FIG. 18 is a configuration diagram showing an embodiment of the entire conventional monitoring system.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Central monitoring and control apparatus 4 ... CPU 6 ... LAN 11 ... Monitoring and control apparatus 11a ... Base station 11a-1 ... Radio 11a-2 ... Distributors 12-1, 12-2, 12- 3 Terminal information monitoring and control device 12a Portable information terminal 12b Wireless mobile station

Claims (3)

[Claims] 1. A plurality of monitoring and control devices for collecting and controlling information on equipment states related to a series of operations of a plant are connected to a central monitoring device via an information network, and collected by the monitoring and control device. A monitoring system that displays the received information on a terminal information monitoring and control device, wherein each of the monitoring and control devices includes a base station that transmits and receives information by radio waves, and the terminal information monitoring and control device monitors and controls the operation state of the equipment of the plant A portable information terminal and a portable station that transmits and receives information with a wireless device that controls multi-channel access control and access and paging on different channels, and that transmits and receives information from the portable station to a base station. , The transmission time zone, the establishment of a line between the radios and the normality of the line between the terminals are determined by a code, and a mobile station specific A monitoring system using a separate access method, characterized in that a function of transmitting a signal by providing a pause at regular intervals by a channel and a continuous transmission method and time management is provided. 2. The monitoring system according to claim 1, wherein a base station in a group configuration is provided for each control purpose in the plant, and the mobile station is connected to another base station in the group. A monitoring system based on a separate access method, wherein a group broadcast communication method in which a high-priority call can be set only to a specific target base station without affecting the target base station is adopted. 3. The monitoring system according to claim 1, wherein the monitoring control device at the connection destination of each base station receives the highest reception level at the highest reception level when a line establishment request is received from the mobile station. A monitoring system using a separate access method, characterized in that the base station receiving the strongest signal is instructed to make a connection with the mobile station.