JP5606652B2 - Control and monitoring signal transmission system - Google Patents

Description

  The present invention reduces the number of signal lines between a master station connected to a control unit and a plurality of output units and input units, or a plurality of slave stations corresponding to a plurality of controlled devices, and connects them with a common data signal line. In a control / monitor signal transmission system that transmits data using a transmission synchronization method such as synchronizing with a transmission clock, the slave station maintenance method for checking the operation of the slave station, replacing a failed slave station, and the like. It relates to the slave station terminal used for the system.

  In a control system including a control unit, a plurality of output units and input units, or a plurality of controlled devices, so-called wiring saving, which reduces the number of wirings, is widely implemented. As a general technique for reducing the wiring, a parallel signal and a serial signal are used instead of a parallel connection that directly connects a plurality of output units and input units or signal lines extending from a controlled device to the control unit. The master station and the plurality of slave stations having the conversion function are connected to the control unit, the plurality of output units and the input unit, or the plurality of controlled devices, respectively, and common data between the master station and the plurality of slave stations. A method of exchanging data with a serial signal via a signal line is widely adopted.

  When wiring saving is realized, when a failure of the output unit, input unit, or controlled device cannot be specified on the control unit side in a state where a large number of slave stations are connected, move away from the control unit. It is necessary to check each output unit, input unit, or controlled device, and it takes a lot of man-hours to identify the failed part.

  Therefore, the present applicant has proposed a remote wiring check system disclosed in Japanese Patent Application Laid-Open No. 2011-114449 as a system for identifying a disconnection failure between a slave station and an input unit and an output unit on the control unit side. ing. In this remote wiring check system, in a control / monitor signal transmission system having a single control unit and a plurality of controlled devices, between a master station and a slave station connected by a reduced data signal line. A management data area including connection data indicating a wiring state is provided, which is different from a control / monitor data area composed of control data (output data) and monitoring data (input data) transmitted in both directions simultaneously. In the connection data, short-circuit information, disconnection information, and normal information are identified. For this reason, it is possible to easily check the wiring connection state between the slave station itself, the slave station and the input unit, or between the slave station and the output unit without reducing the input data (monitoring data) capacity of the signal.

JP 2011-114449 A

  However, what can be confirmed by the remote wiring check system is the state of wiring connection between the slave station itself, the slave station and the input unit, or the slave station and the output unit, and the slave station itself or the slave station and the input unit or slave station. In the case where there is a malfunction in the operation with the output unit, the cause of the malfunction could not be confirmed. Therefore, inspection work is required at the place (site) where the slave station is installed. Then, when performing inspection work at the site, there is a problem that operation of a control unit far from the site is required in order to transmit a control signal for confirming output operation to the slave station. Furthermore, input operation confirmation data related to input from the input unit has to be input by a test switch. In addition, when the failed input unit or output unit is removed from the slave station, or when the failed slave station is removed, the control unit that receives connection data indicating short-circuit information, disconnection information, and normal information in the system There is a possibility that it may be judged as abnormal, and there is a problem that the entire system may have to be stopped for maintenance and inspection of a small number of slave stations. That is, there is a problem that the maintenance and inspection work of the slave station at the site cannot be easily performed because it is affected by the control unit far from the site.

Therefore, the present invention is such that a master station connected to a control unit, a plurality of output units, an input unit, and a plurality of slave stations corresponding to controlled devices are connected by a common data signal line, and data transmission is performed by a transmission synchronization method. It is an object of the present invention to provide a control / monitoring signal transmission system that makes it possible to easily perform maintenance and inspection work on a slave station at a location where the slave station is installed.

In the control / monitor signal transmission system according to the present invention, a master station and a plurality of slave stations are connected by a common data signal line, data is transmitted by a transmission synchronization method, and the transmission signal is transmitted to the common data signal line. In addition, a management data area different from the control / monitor data area composed of the transmission control data and the transmission monitoring data is provided. The slave station is an output function for outputting output information based on slave station control data extracted from the transmission signal to an output unit corresponding to the local station, or monitoring data obtained by acquiring input information from the input unit corresponding to the local station As an input function for outputting to the common data signal line, or both the output function and the input function. And, to the slave station, a terminal unit separate from the slave station exchanges data, and the slave station that receives a maintenance check instruction from the terminal unit is in a mode according to the content of the maintenance check instruction. (Hereinafter referred to as “maintenance and inspection mode”) is transmitted to the master station superimposed on the management data area, and the slave station control data is invalidated according to the content of the maintenance and inspection instruction. , Output data processing for outputting the output information based on data received from the terminal device, or invalidating the slave station input data based on the input information, and based on the data received from the terminal device, the monitoring data To the common data signal line, or both the output data processing and the input data processing are performed, and the mode is a mode in which the slave station is connected / disconnected online. The master station continues the normal operation regardless of the content of the connection detection information from the slave station. Note that data exchange between the slave station and the terminal may be performed without contact or may be performed with contact.

The synchronization method of the transmission synchronization method engagement Ru control and supervisory signal transmission system of the present invention, for example, methods utilizing a transmission clock generated by the timing generation unit included in the master station is suitable. In this case, under the control of the transmission clock, the master station outputs a series of pulse signals as a control signal to the common data signal line according to the value of the control data delivered from the control unit, The data value of the monitoring signal superimposed on the signal for each cycle of the clock from each of the plurality of slave stations is extracted and transferred to the control unit. On the other hand, each of the plurality of slave stations counts the pulses of the series of pulse signals starting from the start signal indicating the start of the series of pulse signals, and when the count value matches the own station address number, The data corresponding to the local station is extracted from the pulse-shaped signal and the monitoring signal is superimposed on the series of pulse-shaped signals in the same pulse cycle as the clock from which the data corresponding to the local station is extracted, or the count value is When it matches with the address number of the local station, data corresponding to the local station is extracted from the series of pulse signals, or the monitoring signal is superimposed on the series of pulse signals. However, the synchronization method is not limited, and a method suitable for the system design condition may be adopted.

  When the maintenance / inspection mode is a mode for confirming connection with the common data signal line related to the slave station, the slave station is connected to the management data area based on data received from the terminal. May be output.

  When the maintenance / inspection mode is a mode for confirming the output function, the slave station may invalidate the slave station control data and output the output information based on data received from the terminal. .

  When the maintenance / inspection mode is a mode for confirming the input function, the slave station confirms the slave station based on the data received from the terminal unit as invalid the slave station input data based on the input information. The display of the display means for operation may be an operation display.

  When the maintenance / inspection mode is a mode for confirming the control program of the control unit for the slave station, the slave station invalidates the slave station input data based on the input information based on the data received from the terminal. The monitoring data may be output to the common data signal line to check whether the output unit performs a predetermined operation.

  When the maintenance / inspection mode is a mode for performing on-line attachment / detachment of the slave station, the master station may validate the connection regardless of the content of the connection detection information from the slave station. In this case, the master station may recognize the end of the mode when the connection detection information transmitted from the slave station is changed from non-connection.

A slave station terminal used in the control / monitor signal transmission system according to the present invention is connected to a common data signal line to which the master station is connected, and includes an address extractor, a control data extractor, a monitor data transmitter, a management Control data extraction means, input means, output means, management monitoring data transmission means, terminal interface means, first storage means, and second storage means.
The address extraction means counts the pulses of the transmission signal starting from a start signal indicating the start of the transmission signal transmitted to the common data signal line, and outputs a timing signal whose count value matches the own address number. obtain.
The control data extraction means extracts and outputs slave station control data based on the timing signal.
When the timing signal is delivered from the address extracting unit to the transmission signal, the monitoring data transmitting unit outputs monitoring data as information from the local station to the common data signal line.
The management control data extracting means extracts management control data superimposed by the master station in a management data area different from the control / monitoring data area composed of transmission control data and transmission monitoring data in the transmission signal.
The input unit takes in the input information from the input unit corresponding to the own station, and the output unit outputs the output information to the output unit corresponding to the own station.
The management monitoring data transmission means superimposes a signal constituting management monitoring data as information from the own station in the management data area.
The HT interface means exchanges data without contact with a separate terminal, and outputs the data received from the terminal device to the management monitoring data transmission means.
The first storage means receives data from the control data extraction means and the terminal interface means, invalidates the slave station control data received from the control data extraction means based on the data received from the HT interface means, and Data received from the interface means is delivered to the output means.
The second storage means receives data from the input means and the terminal interface means, invalidates the slave station input data received from the input means based on the data received from the HT interface means, and receives the data from the HT interface means. The received data is delivered to the monitoring data transmission means.

A slave station terminal used in the control / monitoring signal transmission system according to the present invention is provided with display means connected to the second storage means and switching display contents in accordance with data received from the second storage means. May be.

In the control / monitoring signal transmission system of the present invention, since the slave station exchanges data with a separate terminal, it can directly input a control signal for confirming output operation to the slave station at the site. In addition, the slave station superimposes data indicating the maintenance / inspection mode according to the content of the maintenance / inspection instruction transmitted from the terminal unit on the management data area, and the master station transmits the slave station based on the data superimposed on the management data area. Occurs when the station's maintenance / inspection mode information is transferred to the control unit, so that the input / output unit of the slave station subject to maintenance / inspection is removed from the slave station, or the faulty slave station is removed It is possible to prevent the system abnormality from being judged. Therefore, it becomes possible to easily perform maintenance and inspection work of the slave station at the place where the slave station is installed.

  Also, the slave station performs output data processing that outputs the output information based on the data received from the terminal device, invalidating the slave station control data, according to the content of the maintenance inspection instruction from the terminal device. The output function can be checked while connected to the. In addition, the input data based on the input information is invalidated, and the input data processing for outputting the monitoring data to the common data signal line based on the data received from the terminal is performed, thereby checking the input function while being connected to the system. Is possible.

It is a system configuration diagram of a slave station terminal in the embodiment of the engagement Ru control and supervisory signal transmission system of the present invention. 1 is a system configuration diagram showing a schematic configuration of a control / monitor signal transmission system. It is a system configuration | structure figure of a master station. It is a schematic diagram of the transmission system between a master station and a slave station. It is a front view of a terminal device. It is a system block diagram of a terminal device. It is a figure which shows the flow of a process of a connection check test mode. It is a figure which shows the flow of a process of the self input / output test mode. It is a figure which shows the flow of a process of input / output simulation test mode. It is a figure which shows the flow of a process of online desorption mode. It is a time chart figure of a transmission clock signal. It is a schematic diagram of an IDX address table.

With reference to FIG. 1-12, an embodiment of the engagement Ru control and supervisory signal transmission system of the present invention.
As shown in FIG. 2, the control / monitor signal transmission system includes a single master station 2 connected to the control unit 1 and the common data signal lines DP and DN (hereinafter also referred to as transmission lines), It comprises a plurality of input / output slave stations 4, output slave stations 6 and input slave stations 7 connected to the common data signal lines DP and DN. In FIG. 2, for convenience of illustration, each slave station is shown one by one, but there is no limitation on the type and number of slave stations connected to the common data signal lines DP and DN.

  The input / output slave station 4, the output slave station 6, and the input slave station 7 are provided with a signal output process for the output unit 8 that operates in response to an output instruction from the control unit 1 and an input unit 9 that incorporates input information to the control unit 1. One or both of the input signal processing is performed. The output unit 8 is, for example, an actuator, a (stepping) motor, a solenoid, a solenoid valve, a relay, a thyristor, or a lamp. The input unit 9 is, for example, a reed switch, a micro switch, a push button switch, or a photoelectric switch. And various sensors. The input / output slave station 4 is connected to a controlled device 5 including an output unit 8 and an input unit 9, the output slave station 6 is connected only to the output unit 8, and the input slave station 7 is connected only to the input unit 9. Has been. The output slave station 6 may include an output unit 8 (output unit integrated slave station 80), and the input slave station 7 includes an input unit 9 (input unit integrated slave station 90). It may be.

  The control unit 1 is, for example, a programmable controller, a computer, and the like, and is extracted from the output unit 11 that sends out the control parallel data 13 and the control management parallel data 14, and the monitoring signals from the input / output slave station 4 and the input slave station 7. And an input unit 12 for receiving the first management monitoring parallel data 16 and the second management monitoring parallel data 17 obtained based on the management monitoring data extracted from the monitoring monitoring data 15 and the management monitoring data extracted from the management monitoring signal. . These output unit 11 and input unit 12 are connected to the master station 2. In addition, management judging means 18 for calculating data transmitted from the output unit 11 based on data received from the input unit 12 is provided.

  As shown in FIG. 3, the master station 2 includes an output data unit 21, a management data unit 22, a timing generation unit 23, a master station output unit 24, a master station input unit 25, and an input data unit 26. A control signal (hereinafter referred to as a transmission clock signal) that is connected to the common data signal lines DP and DN and is a series of pulse signals corresponding to the transmission signal of the present invention is connected to the common data signal lines DP and DN. Monitoring signal and management monitoring signal transmitted from the input / output slave station 4, the output slave station 6, or the input slave station 7 (hereinafter referred to as "slave stations 4, 6, 7" when referring to all of them) The monitoring parallel data 15, the first management monitoring parallel data 16 and the second management monitoring parallel data 17 extracted from the above are sent to the input unit 12 of the control unit 1.

  The output data unit 21 delivers the control parallel data 13 from the output unit 11 of the control unit 1 to the master station output unit 24 as serial data.

  The management data unit 22 includes a storage unit 29 that stores an IDX address table in which information on each of the slave stations 4, 6, and 7 is aggregated, and the control management parallel data 14 and the IDX address table from the output unit 11 of the control unit 1. Based on the above, management control data composed of first management control data ISTo and second management control data IDXo, which will be described later, is created and delivered to the master station output unit 24 as serial data. The IDX address table includes data for specifying any one of the input / output slave station 4, the output slave station 6 and the input slave station 7. In this embodiment, the IDX address table includes the data of the slave stations 4, 6, and 7. The head address number is used. FIG. 12 shows an example of an IDX address table using the head address number.

  As shown in FIG. 12, the station to which the address number of # ad0 is assigned has a 1-bit monitoring signal data value, and the data in the IDX address table is a continuous value of # ad0 and # ad1. On the other hand, since the station to which the address number of # ad1 is assigned has the data value of the monitoring signal of 2 bits, the pulse of # ad2 is also assigned to the same station as # ad1. Therefore, in the data of the IDX address table, # ad3 is stored as the next value of # ad1. In this embodiment, even if the data value of the monitoring signal is 1 bit, that is, # ad0 is also set as the head address number in the same manner as # ad1. Although not shown, the IDX address table also stores the classification data of the slave stations corresponding to each address number. For example, “1” is assigned to the input slave station 7, “2” is assigned to the output slave station 6, and “3” is assigned to the input / output slave station 4, which are stored as corresponding to each address number.

  The timing generation unit 23 includes an oscillation circuit (OSC) 31 and a timing generation unit 32. Based on the OSC 31, the timing generation unit 32 generates a timing clock of this system and supplies it to the master station output unit 24 and the master station input unit 25. hand over.

  The master station output unit 24 includes control data generating means 33 and a line driver 34. Based on the data received from the output data section 21 and the timing clock received from the timing generation section 23, the control data generation means 33 transmits a series of pulse signals to the common data signal lines DP and DN via the line driver 34. Send a clock signal.

  As shown in FIG. 4, the transmission clock signal has a control / monitoring data area following the start signal ST. The control / monitoring data area includes control signal data (transmission control data of the present invention) OUTn (n is an integer) transmitted from the master station 2 and monitoring signal data (transmission monitoring of the present invention) transmitted from the slave station 4. Data) INn (n is an integer). As shown in FIG. 11, the pulse of the transmission clock signal has a high potential level (+ 24V in this embodiment) in the second half of one cycle and a low potential level (+ 12V in this embodiment) in the first half. The pulse width interval of the first half of the pulse that becomes the level becomes the output data period, and the first half of the pulse that becomes the low potential level also becomes the input data period. The pulse width interval of the low potential level represents the control signal data OUTn, and the presence or absence of the current superimposed on the low potential level represents the monitoring signal data INn. In this embodiment, when one cycle of the transmission clock signal is t0, the pulse width interval of the low potential level is extended from (1/4) t0 to (3/4) t0. As long as it corresponds to the value of each data of the control parallel data 13, the width is not limited and may be determined appropriately. Also, the input data period and the output data period can be appropriately determined. For example, the input data period is set to the first half of the pulse (low potential level) as in this embodiment, and the pulse width interval of the second half of the pulse (high potential level) is set. Alternatively, the output data period may be the first half of the pulse (low potential level) and the second half of the pulse (high potential level) may be the input data period as in this embodiment. Further, the latter half of the pulse (high potential level) may serve as both the output data period and the input data period. The same applies to the case where the second half of one cycle of the transmission clock signal is at a low potential level. In FIG. 4, the upper part shows the control data (output data) period, and the lower part shows the monitoring data (input data) period.

  The management data area of the transmission clock signal includes a management control data area in which the management control signal transmitted from the master station 2 is superimposed, and management monitoring data in which the management monitoring signal transmitted from the slave stations 4, 6, 7 is superimposed. Consists of regions. The management control data transmitted by the management control signal is composed of the first management control data ISTo and the second management control data IDXo, and is expressed as a pulse width interval of a low potential level, like the control signal data OUTn. Further, the management monitoring data transmitted by the management monitoring signal is composed of the first management monitoring data STi and the second management monitoring data IDXi. Like the monitoring signal data INn, the presence / absence of the current superimposed on the low potential level is determined. expressed. In this embodiment, the first management control data ISTo and the second management control data IDXo are instruction data for specifying the type of data requested to the slave stations 4, 6, 7 and the slave stations 4, 6, 7 Address data for specifying any one of these. On the other hand, the first management monitoring data STi and the second management monitoring data IDXi are data indicating the status of the own station, and further, data other than “0” is always transmitted as the management monitoring data. When the slave stations 4, 6, and 7 are not connected to the common data signal line, the management monitoring data is not sent to the common data signal line, and the management monitoring data is “0”. Therefore, it can be seen that when the management monitoring data is “0”, it is in a disconnected state, and when it is not “0”, it is in a connected state. That is, it becomes connection detection information of the present invention.

  The start signal ST has the same potential level as the high potential level of the transmission clock signal and is a signal longer than one cycle of the transmission clock signal.

  The master station input unit 25 includes a monitoring signal detection unit 35 and a monitoring data extraction unit 36. The monitoring signal detection means 35 detects the monitoring signal transmitted from the slave station 4 via the common data signal lines DP and DN. As described above, the data value of the monitoring signal is represented by the presence or absence of the current superimposed on the low potential level. After the start signal ST is transmitted, the monitoring signal is sequentially transmitted from each of the slave stations 4, 6, and 7. Is supposed to receive. (The output slave station 7 has only the management monitoring signal) The data of the monitoring signal is extracted by the monitoring data extracting means 36 in synchronization with the signal of the timing generating means 32. Then, the monitoring signal data is sent to the input data unit 26 as serial input data. Management monitoring data 39 extracted from the management monitoring signal is also sent to the input data unit 26.

  The input data unit 26 converts the serial input data received from the master station input unit 25 into parallel (parallel) data, and sends the parallel data to the input unit 12 of the control unit 1. Further, the management monitoring data 39 received from the master station input unit 25 is separated into the first management monitoring parallel data 16 and the second management monitoring parallel data 17 and sent to the input unit 12.

  As shown in FIG. 1, the input / output slave station 4 includes a transmission receiving means 41, a management control data extracting means 42, an address extracting means 43, an address setting means 44, a management monitoring data sending means 45, a monitoring data sending means 46, an ID A slave station input / output unit 40 having address response means 47, HT interface means 48, control data extraction means 61, first storage means 62, output means 63, input means 71 and second storage means 72 is provided. The input slave station 7 of this embodiment includes an MCU which is a microcomputer control unit as an internal circuit, and this MCU functions as the slave station input / output unit 40. Calculations and storages necessary for the processing are executed using the CPU, RAM, and ROM included in the MCU. The CPU, RAM, and ROM in the processing of each of the above-described units constituting the slave station input / output unit 40 For the sake of convenience of explanation, the relationship between and is assumed to be omitted.

  The transmission receiving unit 41 receives the transmission clock signal transmitted to the common data signal lines DP and DN, and delivers it to the management control data extraction unit 42, the address extraction unit 43, and the management monitoring data transmission unit 45. The management control data extraction unit 42 extracts the data of the management control signal from the management data area of the transmission clock signal and delivers these to the ID address response unit 47. On the other hand, the address extracting means 43 counts pulses starting from the start signal ST indicating the start of the transmission clock signal, and the count value is the own station address number data based on the head address number set by the own station address setting means 44. The monitoring data transmission means 46 is validated at a timing that coincides with the control data and the control data is delivered to the control data extraction means 61.

  The monitoring data transmission means 46 is enabled by the input timing delivered from the address extraction means 43, and the base current of the transistor TR is set to “on” or “off” based on the data delivered from the second storage means 72. . When the base current is “on”, the transistor TR is turned “on”, and a current signal as a monitoring signal is output to the common data signal lines DP and DN. In this embodiment, as shown in FIG. 11, when the data value of the monitoring data is “1”, it is expressed by flowing a current (for example, 30 mA) of a predetermined value Ith or more. Therefore, for example, the monitoring data at the address numbers 0 (# ad0), 1 (# ad1), 2 (# ad2), and 3 (# ad3) of the signal shown in FIG. It represents “0”, “1”, “0”.

  The management monitoring data transmission means 45 counts pulses starting from the start signal ST of the transmission clock signal, and obtains the timing of the management data area. Then, based on the data delivered from the ID address response means 47 or the HT interface means 48, the base current of the transistor TR is output, and a current signal which is a management monitoring signal is output to the common data signal lines DP and DN.

  When the second management control data IDXo delivered from the management control data extraction unit 42 matches the own station address number data, the ID address response unit 47 displays data indicating the ID response mode as the first management monitoring data STi. The head address number data of the own station is output as the second management monitoring data IDXi. However, the timing at which the head address number data is output is delayed by one frame transmission cycle from the frame in which the data IDXo of the management control data signal matches the local address number data.

  The HT interface unit 48 includes a light projecting unit 64 and a light receiving unit 74, and exchanges data without contact with a separate terminal device 50. Then, various command modes corresponding to the contents of the maintenance inspection instruction received from the terminal device 50 are stored, and the command mode data is stored in the management monitoring data transmission means 45, the first storage means 62, and the second storage means 72. hand over. Further, the HT control data D <b> 2 is delivered to the first storage unit 62 in response to the instruction of the output “on” or the output “off” received from the terminal device 50. Further, the HT input data D 7 is delivered to the second storage means 72 in response to the input “on” or input “off” instruction received from the terminal device 50. Furthermore, when a command signal for setting management monitoring data (connection detection information of the present invention) including data of the head address number for connection check to “0” is input from the terminal 50, the “0” data is managed. It is delivered to the monitoring data transmission means 45. In this embodiment, data exchange between the HT interface means 48 and the terminal device 50 is performed without contact, but there is no limitation on the data exchange method. The HT interface means 48 and the terminal device 50 may be connected by a data signal line, and data exchange may be performed in contact (wired).

  The control data extraction means 61 extracts a data value from the control data delivered from the address extraction means 43 and delivers the slave station control data D1 to the first storage means 62. The first storage means 62 outputs data D3 based on the slave station control data D1 delivered from the control data extraction means 61 when the slave station is in normal operation and in the connection check test mode or the input / output simulation test mode. Is delivered to the output means 63. On the other hand, when the command mode delivered from the HT interface unit 48 is the self-input / output test mode, the output data D3 based on the HT control data D2 delivered from the HT interface unit 48 is delivered to the output unit 63. The output means 63 converts the output data D3 delivered from the first storage means 62 into parallel data and outputs it as output information D4 to the output unit 8 to operate or stop the output unit.

  The second storage means 72 is based on the slave station input data D6 delivered from the input means 71 when the slave station is in normal operation and when the command mode delivered from the HT interface means 48 is the connection check test mode. The monitoring data D8 is delivered to the monitoring data transmission means 46. On the other hand, when the command mode delivered from the HT interface unit 48 is the input / output simulation test mode, the slave station input data D6 delivered from the input unit 71 is invalidated, and the HT input data D7 delivered from the HT interface unit 48 is invalidated. The monitoring data D8 based on the above is delivered to the monitoring data transmitting means 46. Further, when the command mode delivered from the HT interface means 48 is the self-input / output test mode, the slave station input data D6 delivered from the input means 71 is invalidated, and the HT input data D7 delivered from the HT interface means 48 is invalidated. The display means 73 is displayed on the basis of the above.

  The terminal device 50 shown in FIGS. 5 and 6 includes a terminal transmitter / receiver 51, a terminal input unit 52, and a terminal display unit 53, and has an MCU which is a microcomputer control unit as an internal circuit. Yes. Since any of these can be configured with known components and circuits, a detailed description thereof will be omitted, and only an outline of the function will be briefly described. The terminal transmitter / receiver 51 includes a light projecting element and a light receiving element, and when directed to the slave stations 4, 6, 7, issues a command signal to the HT interface means 48 or is sent from the HT interface means 48. Received floodlight signal. As the command signal, a signal for mode selection for maintenance and inspection of the input / output slave station 4, a signal for confirming input operation, a signal for confirming output operation, and the like are issued. The modes that can be selected are a connection check test mode, a self-input / output test mode, an input / output simulation test mode, and an online detachment mode. A maintenance inspection method using these modes will be described later.

  Similarly to the input / output slave station 4, the output slave station 6 and the input slave station 7 include MCUs that are microcomputer control units as internal circuits, and these MCUs are slave station output units 60 or slave station input units 70. As a function. Similar to the MCU of the slave station input / output unit 40, calculations and storages necessary for processing of the output slave station 6 or the input slave station 7 are executed using the CPU, RAM, and ROM included in this MCU. It has become a thing. The output slave station 6 does not include the monitoring data transmission means 46, the input means 71, and the second storage means 72, and the input slave station 7 does not include the control data extraction means 61, the first storage means 62, and the output means 63. However, since the other configuration is the same as that of the input / output slave station 4, description of the configurations of the output slave station 6 and the input slave station 7 is omitted.

Next, a maintenance and inspection method for the input / output slave station 4 in the control / monitoring signal transmission system having the above-described configuration will be described.
In maintenance / inspection of the input / output slave station 4, the mode is set according to the work content. Prior to the mode setting, first, the terminal device 50 obtains the head address number of the input / output slave station 4 to be maintained and inspected. To do.

  In obtaining the head address number, as shown in FIGS. 7, 8, 9, and 10, first, the terminal device 50 transmits a slave station head address read command signal to the input / output slave station 4 (each figure). Step 1). Upon receiving this command signal, the input / output slave station 4 extracts the head address number and delivers it to the terminal device 50. In response to this, the terminal 50 stores the head address number (step 2 in each figure), and then the terminal 50 transmits to the input / output slave station 4 as a command signal designating a desired mode.

  When the terminal device 50 transmits to the input / output slave station 4 as a command signal designating the connection check test mode (corresponding to the mode for confirming the connection related to the slave station of the present invention), as shown in FIG. The station 4 stores that it is in the connection check test mode, and outputs data indicating the connection check test mode to the common data signal lines DP and DN as the first management monitoring data STi. The master station 2 extracts this data and notifies the control unit 1 that the connection check test mode has started in the input / output slave station 4 corresponding to the head address number specified by the second management control data IDXo. (Step 3 in FIG. 7)

  Subsequently, when the terminal 50 transmits a command signal for setting the management monitoring data of the head address number to “0” to the input / output slave station 4, the input / output slave station 4 receiving the command signal receives the first management monitoring data STi. And the second management monitoring data IDXi are set to “0”, and management monitoring data indicating a non-connected state is output to the common data signal lines DP and DN. (Step 4 in FIG. 7) The master station 2 that has received this handed over 0 data to the control unit 1 as the extracted management monitoring data. In the control unit 1 that has received this, the input / output slave station 4 has a disconnection failure. Judge that there is. However, since the control unit 1 recognizes that the input / output slave station 4 is in the connection check test mode, it does not determine the system abnormality and continues the normal operation of the system. At this time, if the control unit 1 does not determine that the input / output slave station 4 is broken, it can be understood that the system connection check function is not functioning normally.

  When the connection check test is completed, a command signal for ending the connection check test mode is transmitted from the terminal device 50 to the input / output slave station 4. Receiving this, the input / output slave station 4 ends the connection check test mode, and outputs data indicating the end of the connection check test mode to the common data signal lines DP and DN as the first management monitoring data STi. The master station 2 extracts this data and notifies the control unit 1 that the connection check test mode has been completed at the input / output slave station 4 corresponding to the head address number specified by the second management control data IDXo. (Step 5 in FIG. 7) Then, the input / output slave station 4 performs the slave station normal operation.

  When the terminal 50 transmits to the input / output slave station 4 as a command signal designating the self-input / output test mode (equivalent to the mode for confirming the output function and the mode for confirming the input function of the present invention), FIG. As shown in FIG. 4, the input / output slave station 4 stores that the self-input / output test mode is set, and outputs data indicating the self-input / output test mode to the common data signal lines DP and DN as the first management monitoring data STi. . The master station 2 extracts this data and notifies the control unit 1 that the self-input / output test mode has started in the input / output slave station 4 corresponding to the head address number specified by the second management control data IDXo. (Step 3 in FIG. 8)

  Subsequently, when a command signal of input “on”, input “off”, output “on”, or output “off” is transmitted to the input / output slave station 4 from the terminal device 50, the input / output slave station 4 that has received the command signal. Then, it operates as follows.

  First, when the command signal is input “on” or “off”, the slave station input data D6 based on the input information D5 from the input unit 9 is invalidated in the second storage means 72 and stored in the second storage means 72. The connected display means 73 displays an operation based on the HT input data D7. (Step 4 in FIG. 8) When the display means 73 displays an operation according to the instruction transmitted from the terminal device 50 and does not display a normal operation with respect to the input from the input unit 9 during the normal operation of the slave station. It can be confirmed that the input unit 9 is not functioning normally.

  When the command signal is output “on” or output “off”, the slave station control data D1 delivered from the control data extracting means 61 is invalidated in the first storage means 62, and the output unit 8 is set to the HT control data D2. Operates based on. (Step 4 in FIG. 8) When the output unit 8 does not operate according to the instruction transmitted from the terminal device 50, the control data transmitted from the master station 2 during normal operation of the slave station is functioning normally. It can be confirmed that there is not.

  In any case of the input “on”, the input “off”, the output “on”, and the output “off”, the control unit 1 sets the input / output slave station 4 to the self-input / output test mode. Therefore, the control data and monitoring data related to the input / output slave station 4 are invalidated and the normal operation of the system is continued.

  When the self input / output test is completed, a command signal for ending the self input / output test mode is transmitted from the terminal device 50 to the input / output slave station 4. In the input / output slave station 4 receiving this, the slave station control data D1 from the control data extracting means 61 is validated in the first storage means 62, and the slave station input data D6 from the input unit 9 in the second storage means 72. Is enabled, the self input / output test mode is ended, and data indicating the end of the self input / output test mode is output to the common data signal lines DP and DN as the first management monitoring data STi. The master station 2 extracts this data and notifies the control unit 1 that the self-input / output test mode has ended in the input / output slave station 4 corresponding to the head address number specified by the second management control data IDXo. (Step 5 in FIG. 8) Then, the input / output slave station 4 performs the slave station normal operation.

  The self-input / output test mode may be used for replacement work when a failure occurs in the input / output interface (output unit 8 or input unit 9). As described above, in the self-input / output test mode, the control unit 1 recognizes that the input / output slave station 4 is in the self-input / output test mode, and controls and monitors data related to the input / output slave station 4. Since the I / O interface is disabled, the entire system is not affected by the removal of the input / output interface. Therefore, a faulty input / output interface can be easily replaced with a new one by using this input / output test mode.

  FIG. 9 shows a case where the terminal 50 transmits to the input / output slave station 4 as a command signal designating the input / output simulation test mode (corresponding to a mode for checking the control program of the control unit for the slave station of the present invention). As described above, the input / output slave station 4 stores that the input / output simulation test mode is set, and outputs data indicating the input / output simulation test mode to the common data signal lines DP and DN as the first management monitoring data STi. The master station 2 extracts this data and notifies the control unit 1 that the input / output simulation test mode has started in the input / output slave station 4 corresponding to the head address number specified by the second management control data IDXo. (Step 3 in FIG. 9)

  Subsequently, when the terminal device 50 transmits the HT input data D7 to the input / output slave station 4, the input / output slave station 4 that has received the HT input data D7 receives the slave station input data D6 based on the input information D5 from the input unit 9. Invalidated in the second storage means 72, the monitoring data based on the HT input data D7 is output to the common data signal lines DP and DN. Receiving this, the master station 2 delivers the extracted monitoring data to the control unit 1, and the control unit 1 receiving this performs processing based on the monitoring data. (Step 4 in FIG. 9) Then, it is possible to confirm whether the input / output slave station 4 is functioning normally or not by the processing contents in the control unit 1. Since the control unit 1 recognizes that the input / output slave station 4 is in the input / output simulation test mode, the process according to the simulation program is performed.

  When the input / output simulation test is completed, a command signal for ending the input / output simulation test mode is transmitted from the terminal device 50 to the input / output slave station 4. In response to this, in the input / output slave station 4, the slave station input data D6 based on the input information D5 from the input unit 9 is validated in the second storage means 72, the input / output simulation test mode is terminated, and the input / output simulation is completed. Data indicating the end of the test mode is output to the common data signal lines DP and DN as the first management monitoring data STi. The master station 2 extracts this data, and notifies the control unit 1 that the input / output simulation test mode has ended in the input / output slave station 4 corresponding to the head address number specified by the second management control data IDXo. (Step 5 in FIG. 9) The input / output slave station 4 performs the slave station normal operation.

  When the terminal 50 transmits to the I / O slave station 4 as a command signal designating the online detachment mode, as shown in FIG. 10, the I / O slave station 4 stores the fact that it is in the online detachment mode. Data indicating the mode is output to the common data signal lines DP and DN as the first management monitoring data STi. The master station 2 extracts this data and informs the control unit 1 that the online detachment mode has started in the input / output slave station 4 corresponding to the head address number specified by the second management control data IDXo. (Step 3 in FIG. 10) The control unit 1 assumes that the input / output slave station 4 is connected to the common data signal lines DP and DN regardless of whether the connection detection information (management monitoring data) is connected or not. Continue the normal operation of the system.

  Since the input / output slave station 4 in the online detachment mode is handled as being connected to the common data signal lines DP and DN in the control unit 1, it can be easily removed from the operating system. . Therefore, the faulty input / output slave station 4 can be easily replaced using this online detachment mode. (Step 4 in FIG. 10) When the exchange is completed and the input / output slave station 4 resumes operation, in the master station 2, the connection detection information (management monitoring data) from the input / output slave station 4 that has resumed operation is disconnected. When the connection is established, the end of the online desorption mode is recognized, and the control unit 1 is informed that the online desorption mode has ended. (Step 5 in FIG. 10) Then, the input / output slave station 4 performs the slave station normal operation.

1 Control Unit 2 Master Station 4 Input / Output Slave Station 5 Controlled Device 6 Output Slave Station 7 Input Slave Station 8 Output Unit 9 Input Unit 11 Output Unit 12 Input Unit 15 Monitoring Parallel Data 16 First Management Monitoring Parallel Data 17 Second Management Monitoring parallel data 18 Management judgment means 21 Output data part 22 Management data part 23 Timing generation part 24 Parent station output part 25 Parent station input part 26 Input data part 29 Storage means 31 OSC (oscillation circuit)
32 Timing generation means 33 Control data generation means 34 Line driver 35 Monitoring signal detection means 36 Monitoring data extraction means 39 Management monitoring data 40 Slave station input / output unit 41 Transmission reception means 42 Management control data extraction means 43 Address extraction means 44 Address setting means 45 Management monitoring data transmission means 46 Monitoring data transmission means 47 ID address response means 48 HT interface means 50 Terminal 51 Terminal transmission / reception section 52 Terminal input section 53 Terminal display section 61 Control data extraction means 62 First storage means 63 Output Means 64 Projecting means 71 Input means 72 Second storage means 73 Display means 74 Light receiving means 80 Output unit integrated slave station 90 Input unit integrated slave station TR Transistor D1 Slave station control data D2 HT control data D3 Output data D4 Output information D5 Input information D6 Slave station input data 7 HT input data D8 monitoring data

Claims (6)

The master station and multiple slave stations are connected by a common data signal line, and data transmission is performed by the transmission synchronization method.
The transmission signal transmitted to the common data signal line is provided with a management data area different from the control / monitoring data area composed of transmission control data and transmission monitoring data,
The slave station is an output function for outputting output information based on slave station control data extracted from the transmission signal to an output unit corresponding to the local station, or monitoring data obtained by acquiring input information from the input unit corresponding to the local station As an input function to output to the common data signal line, or both the output function and the input function,
A terminal unit separate from the slave station exchanges data with the slave station, and the slave station that receives a maintenance check instruction from the terminal shows a mode according to the content of the maintenance check instruction. The data is superimposed on the management data area and transmitted to the master station, and the slave station control data is invalidated according to the content of the maintenance / inspection instruction, and the output is based on the data received from the terminal. Output data processing for outputting information, or input data processing for invalidating the slave station input data based on the input information and outputting the monitoring data to the common data signal line based on data received from the terminal unit, Or both the output data processing and the input data processing,
When the mode is a mode for performing on-line detachment of the slave station, the master station continues normal operation regardless of the contents of the connection detection information from the slave station. . The control / monitor signal transmission system according to claim 1, wherein the master station recognizes the end of the mode when the connection detection information transmitted from the slave station changes from non-connection to connection. When the mode is a mode to confirm the connection between the common data signal line relating to the slave station, the slave station is in the management data area, based on data received from the terminal device, the connection detection information The control / monitor signal transmission system according to claim 1, which outputs the control / monitor signal. The said slave station outputs the said output information based on the data received from the said terminal device by invalidating the said slave station control data when the said mode is a mode which confirms the said output function. Control and monitoring signal transmission system. When the mode is a mode for confirmation of the input function, the slave station is as invalid Motozukuko station input data to the input information, based on the data received from the terminal device, a confirmation that the own station is provided The control / monitor signal transmission system according to claim 1, wherein the display of the display means is displayed as an operation . When the mode is a mode to confirm the control program of the control unit for the slave station, the slave station is as invalid Motozukuko station input data to the input information, based on the data received from the terminal device, the The control / monitor signal transmission system according to claim 1, wherein the monitor data is output to the common data signal line to check whether the output unit performs a predetermined operation .

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