WO2013161029A1

WO2013161029A1 - Life detection system and child station terminal using this system

Info

Publication number: WO2013161029A1
Application number: PCT/JP2012/061197
Authority: WO
Inventors: 錦戸憲治; 星洋一
Original assignee: 株式会社エニイワイヤ
Priority date: 2012-04-26
Filing date: 2012-04-26
Publication date: 2013-10-31
Also published as: JP5090581B1; JPWO2013161029A1

Abstract

[Problem] In a control/monitoring signal transmission system in which data transmission is performed by a synchronous transmission system, to provide a life detection system capable of detecting the life of a device that is being controlled, and a child station terminal using this system. [Solution] Using a prescribed other station as a reference station, the child station inputs, as corresponding data from a transmission signal, control data corresponding to the aforesaid reference station or monitoring data transmitted from this reference station. Using output data in respect of the corresponding output section of its own station or input data from the corresponding input section of its own station as own-station data, the child station in question then superimposes a signal constituting data indicating a life warning, or data indicating a normal condition, in the aforementioned management data region, based on the life detection results of its own-station output section, its own-station input section, the output section of the corresponding aforementioned reference station, or the input section of the corresponding aforementioned reference station, using the aforementioned reference data and the aforementioned own-station data.

Description

Lifetime detection method and slave station terminal used for that method

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. The present invention relates to a method for detecting the life of a controlled device and a slave station terminal used for the method in a control / monitor signal transmission system for transmitting data by a transmission synchronization method such as synchronization by a transmission clock.

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.

In the above control system, various devices can be used as an input unit and an output unit, and one of such devices is a relay switch. Since the relay switch can be turned on and off remotely, its use is wide and used in various situations. For example, Japanese Patent Laid-Open No. 9-163465 discloses a remote monitoring system that uses a relay switch to monitor sensor information on the center monitoring unit side far from the sensor installation point. In this remote monitoring system, switching from sensor driving to reference specimen driving is performed by an on / off operation using a relay switch, and the center monitoring unit determines whether the sensor is abnormal or the transmission circuit system is abnormal based on the measurement result. be able to.

However, even in the above remote monitoring system, it is impossible for the center monitoring unit to detect how much life of the input unit and the output unit remains. However, a method for detecting the life of an actuator having an IN terminal and an OUT terminal has been proposed so far. As an example, there is a method disclosed in Japanese Patent Laid-Open No. 2006-331449. In the method disclosed in Japanese Patent Application Laid-Open No. 2006-331449, the OUT terminal connected to the output device (output unit) is turned ON or OFF by OUT data serially communicated with the master unit (master station). A function for acquiring start time information when the input device is changed, a function for acquiring stop time information when the ON or OFF state of the IN terminal to which the input device (input unit) is connected, and start time information A slave (slave station) having a calculation function for calculating the operation time of the output device based on the stop time information is used. Then, according to this slave (slave station), the operation time of the output device or input device is obtained, and this is compared with the setting information for specifying the normal range of the output device or input device. It is possible to determine whether or not the device is normal and whether the replacement time is approaching.

JP-A-9-163465 JP 2006-331449 A

However, in the above-described conventional method for obtaining the operation time of the output unit and the input unit in the slave station, both the start time information of the OUT terminal to which the output unit is connected and the stop time information of the IN terminal to which the input unit is connected are obtained. There were cases where it was difficult to do. That is, when both the output unit and the input unit are connected to one slave station, the start time information and the stop time information are aggregated in the same slave station, but only the output unit or only the input unit is connected. Usually, only one of the information can be acquired in the slave station. A method of directly exchanging information between slave stations connected to each of the output unit and the input unit in correspondence is also conceivable. However, since this is a so-called command transmission method, data is transmitted by a transmission synchronous method. It is difficult to employ in a control / monitor signal transmission system.

The life detection method according to the present invention is a control / monitoring signal transmission system in which a master station and a plurality of slave stations are connected by a common data signal line and data is transmitted by a transmission synchronization method, and transmitted to the common data signal line. The transmission signal to be transmitted is provided with a management data area different from the control / monitor data area composed of the control signal data and the monitor signal data. The slave station takes in control data for the reference station or monitoring data transmitted from the reference station from the transmission signal as reference data with a predetermined other station as a reference station. Then, the local station output unit using the reference data and the local station data using the output data to the local station output unit corresponding to the local station or the input data from the local station input unit corresponding to the local station as the local station data. Based on the lifetime detection result of the local station input unit, the reference station output unit to which the reference station corresponds, or the reference station input unit to which the reference station corresponds, data indicating a normal state or a lifetime alarm in the management data area A signal constituting data indicating is superimposed.

The reference data indicates a reference cumulative number of times that the reference station output unit or the reference station input unit is in an operation-on state or a reference cumulative time in which the reference station output unit or the reference station input unit is in an operation-on state. It is binary data, and the local station data is the cumulative number of times the local station output section or the local station input section is in an operation on state, or the local station output section or the local station input section is in an operation on state. The slave station is provided with output signal switching means, and the output signal switching means includes the reference cumulative number, the reference cumulative time, the local station cumulative number, Alternatively, the data corresponding to the accumulated time of the own station and the data indicating the normal state or the data indicating the life warning may be switched and superimposed on the management data area.

The slave station superimposes a signal constituting data indicating the life warning when the reference accumulated number, the reference accumulated time, the own station accumulated number, and the own station accumulated time satisfy a predetermined logical condition. It may be.

The management data area includes a management control data area in which data from the master station is superimposed and a management monitoring data area in which data from the slave station is superimposed, and the management monitoring data area from the slave station May be determined as data disconnection of the common data signal line when the data extracted from the management monitoring data area in the master station is “0”.

The reference data may be control data or monitoring data for the local station output unit, or control data or monitoring data for the local station input unit.

The slave station terminal according to the present invention is connected to the common data signal line to which the master station is connected, and the transmission signal transmitted to the common data signal line is composed of control signal data and monitoring signal data. A management data area different from the control / monitor data area is provided, and the control data for the reference station or the monitor data transmitted from the reference station is taken as reference data using a predetermined other station as a reference station, Output data to the local station output section corresponding to the local station or input data from the local station input section to which the local station corresponds as local station data, using the reference data and the local station data, the local station output section, the local station The life detection means for detecting the life of the input station, the reference station output section to which the reference station corresponds, or the reference station input section to which the reference station corresponds, and the detection result by the life detection means Zui by, and a management monitoring data transmitting means for superimposing a signal constituting the data indicating the data or the life alarm indicating a normal state to the transmission signal.

In the lifetime detection method according to the present invention, the lifetime of the local station output unit, the local station input unit, the reference station output unit, or the reference station input unit is detected using the reference data and the local station data, and based on the detection result, A signal constituting data indicating a normal state or data indicating a life warning is superimposed on the management data area. In this way, not only the local station data but also the reference data is referred to, so even if both the output unit and input unit are not connected to one slave station, the life of the output unit and input unit is detected. can do.

Further, if data superposed on the management monitoring data area from the slave station is data other than “0”, the data extracted from the management monitoring data area at the master station is output from the slave station when the data extracted from the management monitoring data area is “0”. It can be said that information is not transmitted to the master station via the common data signal line. Therefore, at that time, it can be determined that the common data signal line is disconnected, and the disconnection of the common data signal line can be detected together with the life of the control / monitor signal transmission system.

It is a schematic diagram of a transmission system between a master station and a slave station in an embodiment of a control / monitor signal transmission system employing a life detection system according to 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 system block diagram of an input slave station. It is a data block diagram of a local station address setting means. It is a data block diagram of a reference station address setting means. It is a system block diagram of a lifetime detection means. It is a system block diagram of an output slave station. It is a time chart figure of a transmission clock signal. It is a schematic diagram of an IDX address table stored in the master station.

With reference to FIGS. 1 to 10, an embodiment of a control / monitor signal transmission system employing the life detection method according to the present invention will be described.
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. Note that the output unit 8 and the input unit 9 in the case where the life detection method according to the present invention is applied constitute one interface, but the system configuration may be any device connected. Good. For example, the output unit 8 may be an actuator, a (stepping) motor, a solenoid, a solenoid valve, a relay, a thyristor, a lamp, or the like, and the input unit 9 is a reed switch, a micro switch, a push button switch, a photoelectric switch, or various sensors. Etc. 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. As long as the lifetime detection method according to the present invention is not applied, the output slave station 6 may include the output unit 8 (output unit integrated slave station 80). 7 may include the input unit 9 (input unit integrated slave station 90).

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 start address is used. FIG. 10 shows an example of an IDX address table using the head address.

As shown in FIG. 10, the station to which the address 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 data value of the monitoring signal is 2 bits for the station to which the address of # ad1 is assigned, 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 similarly to # ad1. Further, the IDX address table of this embodiment also stores the classification data of the slave stations corresponding to each address. In the example shown in FIG. 10, “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. It is remembered.

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

The master station output unit 24 includes control data generation means 33 and a line driver 34. Based on the data received from the output data unit 21 and the management data unit 22 and the timing clock received from the timing generation unit 23, the control data generation unit 33 applies a series of data to the common data signal lines DP and DN via the line driver 34. A transmission clock signal is transmitted as a pulse signal.

As shown in FIG. 1, the transmission clock signal has a control / monitoring data area following the start signal ST and a management data area following this. The control / monitoring data area includes control signal data OUTn (n is an integer) sent from the master station 2 and monitoring signal data INn (n is an integer) sent from the input / output slave station 4 or the input slave station 7. Consists of. As shown in FIG. 9, 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. 1, the upper part shows a control data (output data) period, and the lower part shows a 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, or 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 data other than “0” is always transmitted as management monitoring data. Details will be described later.

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

The master station input unit 25 includes monitoring signal detection means 35 and monitoring data extraction means 36. The monitoring signal detection means 35 detects the monitoring signal and the management monitoring signal sent from the

slave stations

4, 6, and 7 via the common data signal lines DP and DN. As described above, the data values of the monitoring signal and the management monitoring signal are represented by the presence / absence of a current superimposed on the low potential level. After the start signal ST is transmitted, first, the input / output slave station 4 or the input A monitoring signal is sequentially received from each of the slave stations 7, and subsequently, a management monitoring signal is received from any one of the

slave stations

4, 6, and 7. Data of the monitoring signal and the management monitoring signal is extracted by the monitoring data extracting unit 36 in synchronization with the signal of the timing generating unit 32. The monitoring signal data is sent to the input data unit 26 as serial input data 37. 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 37 received from the master station input unit 25 into parallel data, and sends the parallel data to the input unit 12 of the control unit 1 as monitoring parallel data 15. 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.

The input slave station 7 corresponds to the slave station terminal of the present invention. As shown in FIG. 4, the transmission receiving means 41, the management control data extracting means 42, the address extracting means 43, the own station address setting means 44, the management A slave station input unit having monitoring data transmission means 45, monitoring data transmission means 46, own station operation state detection means 47, reference station address setting means 48, reference station operation state detection means 49, lifetime detection means 50, and input means 72 70. The input slave station 7 of this embodiment includes an MCU that is a microcomputer control unit as an internal circuit, and this MCU functions as the slave station input unit 70. Calculations and storages necessary for the processing are executed using the CPU, RAM, and ROM included in the MCU, and the CPU, RAM, and ROM in the processing of each of the above-described means constituting the slave station input unit 70 The relationship is omitted for convenience of explanation.

The input unit 9 connected to the input slave station 7 constitutes a corresponding output unit 8 and one interface 91 (in this embodiment, a relay switch). The output slave station 6 to which the output unit 8 constituting the interface 91 is connected is another embodiment of the slave station terminal of the present invention. Like the input slave station 7, an internal circuit is a microcomputer An MCU which is a control unit is provided, and this MCU functions as the slave station output unit 60. Similar to the MCU of the slave station input unit 70, calculations and storages necessary for the processing of the output slave station 6 are executed using the CPU, RAM, and ROM included in this MCU.

Both the output unit 8 and the input unit 9 that are in a corresponding relationship are connected to the input / output slave station 4. Similarly to the output slave station 6 and the input slave station 7, the input / output slave station 4 includes an MCU that is a microcomputer control unit as an internal circuit, and this MCU functions as the slave station input / output unit 40. It has become a thing. Similar to the MCU of the slave station output unit 60 and the MCU of the slave station input unit 70, calculations and storages necessary for the processing of the input / output slave station 4 are performed using the CPU, RAM, and ROM included in this MCU. It is supposed to be executed.

The transmission receiving means 41 of the input slave station 7 receives the transmission clock signal transmitted to the common data signal lines DP and DN, and receives them as management control data extracting means 42, address extracting means 43, and management monitoring data transmitting means 45. To hand over. The management control data extracting unit 42 extracts management control signal data from the management data area of the transmission clock signal, and delivers them to the life detecting unit 50. 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 monitors the count value at the timing when the count value matches the own station address data set by the own station address setting means 44. The data transmission means 46 is validated, and control data corresponding to the reference station is delivered to the reference station operation state detection means 49 at a timing when the count value matches the reference station address.

The monitoring data transmission means 46 sets the base current of the transistor TR to “on” or “off” based on the serial data delivered from the input means 72 when enabled by the input timing delivered from the address extraction means 43. And 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. 9, 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 addresses 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 life detecting means 50, 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.

As shown in FIG. 5, the local station address setting unit 44 delivers the local station address SADR to the address extracting unit 43 and the lifetime detecting unit 50, and also transmits a local station operation state indication value JT indicating the operation state of the local station. Delivered to the operating state detecting means 47. When the local station operation state instruction value JT is “0”, it indicates an operation ON state on the LOW side of input data or output data, and when it is “1”, an operation ON on the HIGH side of input data or output data is instructed. Indicate state. In addition, it is assumed that which value is to be delivered to the local station operation state detection means 47 is defined in advance.

As shown in FIG. 6, the reference station address setting means 48 delivers the reference station input / output address RADR and the input / output designation value RD for designating the type of signal to be fetched to the address extraction means 43 and indicates the operating state of the reference station. The reference station operation state instruction value RT is delivered to the reference station operation state detection means 49. When the reference station operation state indication value RT is “0”, it indicates an operation ON state on the LOW side of input data or output data, and when it is “1”, an operation ON on the HIGH side of input data or output data is instructed. Indicate state. In addition, it is assumed that which value is to be delivered to the reference station operation state detection unit 49 is defined in advance.

The own station operation state detection means 47 uses the data delivered from the input means 72 as own station data, and when the own station data matches the own station operation state instruction value JT delivered from the own station address setting means 44. Then, the local station data is delivered to the life detecting means 50.

The reference station operation state detection means 49 uses the data of the signal delivered from the address extraction means 43 as reference data, and when this reference data matches the reference station operation state instruction value RT delivered from the reference station address setting means 48 Then, the reference data is delivered to the life detecting means 50.

The first threshold value setting means 73, the second threshold value setting means 74, the third threshold value setting means 75, and the fourth threshold value setting means 76 are set with threshold values that are used when the life detection means 50 determines a life abnormality. Specifically, the first threshold value setting means 73 is used for comparison with the own station output unit corresponding to the own station or the own station cumulative number of times that the own station input unit corresponding to the own station has been turned on. One threshold is set. As this first threshold value, if the cumulative number of times that the local station output unit or local station input unit is in the operation-on state is equal to or greater than the first threshold value, the performance degradation or failure of the local station output unit or local station input unit may occur. A value that can be determined to be dangerous is set in advance. The second threshold value setting means 74 is set with a second threshold value used for comparison with the own station accumulated time in which the own station output unit or the own station input unit is in an operation-on state. As this second threshold value, if the accumulated time when the local station output unit or local station input unit is in the operation-on state is equal to or greater than the second threshold value, the performance degradation or failure of the local station output unit or local station input unit may occur. A value that can be determined to be dangerous is set in advance.

The third threshold value setting means 75 is set with a third threshold value used for comparison with the reference accumulated number of times that the reference station output unit corresponding to the reference station or the reference station input unit corresponding to the reference station is in the operation ON state. . As the third threshold value, if the cumulative number of times the reference station output unit or the reference station input unit is in the operation-on state is equal to or greater than the third threshold value, the reference station output unit or the reference station input unit may have a performance degradation or failure. A value that can be determined to be dangerous is set in advance. Further, the fourth threshold value setting means 76 is set with a fourth threshold value used for comparison with the reference accumulated time when the reference station output unit or the reference station input unit is in the operation-on state. As the fourth threshold value, if the accumulated time when the reference station output unit or the reference station input unit is in the operation-on state is equal to or greater than the fourth threshold value, the reference station output unit or the reference station input unit may have a performance degradation or failure. A value that can be determined to be dangerous is set in advance.

Threshold values set in the first threshold value setting means 73, the second threshold value setting means 74, the third threshold value setting means 75, and the fourth threshold value setting means 76 are delivered to the life detection means 50. The threshold values set in each of the first threshold setting means 73, the second threshold setting means 74, the third threshold setting means 75, and the fourth threshold setting means 76 can be changed by downloading from the control unit 1 side. It has become.

As shown in FIG. 7, the life detection means 50 includes an ISTo extraction means 51, an IDXo extraction means 52, a slave station address designation detection means 53, a logic determination means 55, an encoding means 56, and a gate means 62. .

The ISTo extraction means 51 extracts the first management control data ISTo from the management control signal data delivered from the management control data extraction means 42, and delivers it to the slave station address designation detection means 53. Further, the IDXo extraction unit 52 extracts the second management control data IDXo from the management control signal data delivered from the management control data extraction unit 42, and delivers it to the slave station address designation detection unit 53. The own station address data is delivered from the own station address setting means 44 to the slave station address designation detecting means 53.

The slave station address designation detection unit 53 compares the second management control data IDXo with the data value of the local station address, and when they match, delivers predetermined data to the encoding unit 56 in accordance with the first management control data ISTo. . That is, when the first management control data ISTo is data instructing the life detection, the life detection signal D is delivered to the encoding means 56. When the first management control data ISTo is data for instructing monitoring of the current lifetime value data, the lifetime current value data signal L is delivered to the gate means 62. Similarly, when the first management control data ISTo is data for instructing monitoring of input data, the monitoring data signal M is delivered to the gate means 62.

The logic determination unit 55 sends the reference data input from the reference station operation state detection unit 49 and a signal indicating the life detection result based on the own station data input from the own station operation state detection unit 47 to the encoding unit 56. Output. Specifically, the logic determination unit 55 counts the cumulative number of times that the local station output unit or the local station input unit is in an operation-on state based on the local station data input from the local station operation state detection unit 47. The count result is recorded in a nonvolatile memory (not shown) as the cumulative number of times of the own station. Further, the logic determination unit 55 uses a timer (not shown) to calculate the accumulated time when the local station output unit or the local station input unit is in an operation-on state based on the local station data input from the local station operation state detection unit 47. The measured time is recorded in a nonvolatile memory (not shown) as the accumulated time of the own station. Further, the logic determination unit 55 counts the cumulative number of times that the reference station output unit or the reference station input unit has been turned on based on the reference data input from the reference station operation state detection unit 49, and the count result Is stored in a non-volatile memory (not shown) as the reference cumulative number of times. The logic determination means 55 uses a timer (not shown) to calculate the accumulated time when the reference station output section or the reference station input section is in the operation-on state based on the reference data input from the reference station operation state detection section 49. The measured time is recorded in a non-volatile memory (not shown) as a reference accumulated time.

The logic determination means 55 reads the accumulated number of times of the own station from the nonvolatile memory, compares it with the first threshold value input from the first threshold value setting means 73, reads the accumulated time of the own station from the nonvolatile memory, Comparison with the second threshold value input from the threshold value setting means 74 is performed. In addition, the logic determination unit 55 reads the reference cumulative number from the nonvolatile memory, compares it with the third threshold value input from the third threshold setting unit 75, reads the reference cumulative time from the nonvolatile memory, and Comparison with the fourth threshold value input from the threshold value setting means 76 is performed. If any of these comparison results results in a result equal to or greater than the threshold value, the logic determination means 55 determines that the life of the output unit and input unit of the own station or reference station is abnormal. Detect that it is in a state. On the other hand, when all the comparison results are less than the threshold, it is detected that the lifetimes of the output unit and the input unit of the own station or the reference station are in a normal state. The logic determination unit 55 detects the normal signal N indicating the normal state when detecting the normal state, and detects the first threshold value, the second threshold value, the third threshold value, the fourth threshold value when detecting the abnormal state of the life. Corresponding to the threshold value, abnormal signals A1, A2, A3, A4 indicating an abnormal state are output to the encoding means 56. Further, the current life value data LD is output to the gate means 62. Note that here, as a logical judgment, the life is detected to be abnormal if any one of the comparison results of the own station accumulated number, own station accumulated time, reference accumulated number of times, or reference accumulated time satisfies the condition. Although the example to do was demonstrated, the method of logic judgment is not limited to this.

When the life detection signal D is input from the slave station address designation detection unit 53, the encoding unit 56, depending on the normal signal N or the abnormal signal A1, A2, A3, A4 output from the logic determination unit 55, Information indicating normality and life abnormality is converted into predetermined code data, and is transferred to the management monitoring data transmission means 45 as the second management monitoring data IDXi.

At this time, a value other than “0” is adopted for the second management monitoring data IDXi delivered to the management monitoring data transmitting means 45, that is, code data indicating normality or life abnormality. Therefore, data other than “0” is transmitted as management monitoring data. That is, when the management monitoring data is “0”, it can be said that the information output from the input slave station 7 is not transmitted to the master station via the common data signal lines DP and DN. Therefore, at that time, it can be determined that the common data signal line DP, DN is disconnected.

Although the first management monitoring data STi is not used in this embodiment, the first management monitoring data STi can be used when further determination of the second management monitoring data IDXi is necessary. .

As shown in FIG. 8, the MCU of the slave station output unit 60 uses the monitoring data transmission means 46 in the MCU of the slave station input unit 70 of FIG. 4 as the control data extraction means 81 and the input means 72 as the output means 82. It is. The control data extraction means 81 extracts a data value from the control data signal delivered from the address extraction means 43 and delivers it to the output means 82 as serial data. However, the control data extraction means 81 does not output a base current to the transistor TR as shown in FIG. The data value extracted from the control data signal is also delivered to the local station operation state detection means 47 as local station data. The output unit 82 converts the serial data delivered from the control data extraction unit 81 into parallel data, outputs the parallel data to the output unit 8, and causes the output unit 8 to perform a predetermined operation. The other configuration of the MCU of the slave station output unit 60 is the same as that of the MCU of the slave station input unit 70, and thus the description thereof is omitted.

Next, the procedure of the life detection method in the control / monitoring signal transmission system configured as described above will be described.
The control unit 1 outputs management control parallel data 14 for instructing life abnormality detection to the master station 2 at an appropriately set timing or by an arbitrary input instruction by the user. Receiving this, the master station 2 outputs the first management control data ISTo requesting the life abnormality detection and the second management control data IDXo designating one of the data groups stored in the IDX address table. . Note that the IDX address table shown in FIG. 10 has already been created in the management data section 22 of the master station 2, and a transmission cycle composed of the start signal ST, the control / monitor data area, and the management data area that follows the start signal ST. Each time, the start address assigned to all of the input slave stations 7 is sequentially designated by the second management control data IDXo.

The designation of data in the IDX address table by the second management control data IDXo is in accordance with the table number. That is, first, the index address data (# ad0) of the table number 1 is selected and output as the second management control data IDXo. Then, every transmission cycle, the slave station classification data is sequentially changed to head address data corresponding to each table number having “1”. However, the order in which the data of the IDX address table is designated by the second management control data IDXo is not limited, and may be in accordance with the priority order by function, for example.

When the second management control data IDXo coincides with its own address, the output slave station 6 and the input slave station 7 are based on the output from the lifetime detection means 50, and a management monitoring signal composed of data indicating a lifetime abnormality or normality Is superimposed on the management monitoring data area. In response to this, the master station 2 extracts management monitoring data from the management monitoring signal and delivers it to the control unit 1.

The control unit 1 executes a predetermined process according to the contents of the second management monitoring parallel data 16. Specifically, if the second management monitoring parallel data 16 indicates an abnormality, an abnormality display is performed. If the management monitoring data is “0”, it is determined that the common data signal lines DP and DN are disconnected, and a message to that effect is displayed.

Through the above procedure, the control unit 1 can grasp the presence or absence of a disconnection or a life failure in the interface constituted by the output unit 8 and the input unit 9 corresponding to the output slave station 6 and the input slave station 7.

The reference station address can be changed as appropriate from the control unit side. In this case, the data indicating that the reference station address is changed and the data of the changed reference station address are superimposed on the management control data area, and these can be extracted on the output slave station 6 and the input slave station 7 side. That's fine.

This control / monitoring signal transmission system can monitor desired data in addition to life detection. In this case, as shown in FIG. 7, it is assumed that monitoring data 63 to be monitored is input to the gate unit 62 and a monitoring signal M is input from the slave station address designation detection unit 53. It is also assumed that the current life value data LD to be monitored for the current life value data is input to the gate means 62 and the current life value data signal L is input from the slave station address designation detection means 53. The master station 2 transmits the input monitor command data as the first management control data ISTo to the corresponding output slave station 6 or the input slave station 7, thereby specifying the designated output slave station 6 or the input slave station 7. Then, since the monitoring data 63 is output as management monitoring data from the gate means 62 via the management monitoring data transmission means 45, it becomes possible to grasp this on the control unit 1 side. Further, the master station 2 sends the current life value monitor command data as the first management control data ISTo to the corresponding output slave station 6 or the input slave station 7, thereby specifying the specified output slave station 6 or input slave. In the station 7, since the life present value data LD is output as management monitoring data from the gate means 62 via the management monitoring data transmission means 45, it becomes possible to grasp this on the control unit 1 side. .

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 13 Control Parallel Data 14 Management Control Parallel Data 15 Monitoring Parallel Data 16 One management monitoring parallel data 17 Second management monitoring parallel data 18 Management judging means 21 Output data section 22 Management data section 23 Timing generating section 24 Master station output section 25 Master station input section 26 Input data section 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 37 Input data 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 Own station address setting means 45 Management monitoring data sending means 46 Monitoring data sending means 47 Own station operating state detecting means 48 Reference station address setting means 49 Reference station operating state detecting means 50 Life detecting means 51 ISTo extracting means 52 IDXo extracting means 53 Child Station address designation detection means 55 Logic determination means 56 Encoding means 60 Slave station output section 62 Gate means 63 Monitoring data 70 Slave station input section 72 Input means 73 First threshold setting means 74 Second threshold setting means 75 Third threshold setting means 76 Fourth threshold setting means 80 Output unit 1 Type slave station 81 Control data extraction means 82 Output means 90 Input unit integrated slave station 91 Interface A1, A2, A3, A4 Abnormal signal D Life detection signal N Normal signal L Life current value data signal LD Life current value data M Monitoring signal TR transistor

Claims

In a control / monitor signal transmission system in which a master station and a plurality of slave stations are connected by a common data signal line and data is transmitted by a transmission synchronization method.
The transmission signal transmitted to the common data signal line is provided with a management data area different from the control / monitor data area composed of control signal data and monitoring signal data,
The slave station uses a predetermined other station as a reference station, takes control data for the reference station or monitoring data transmitted from the reference station from the transmission signal as reference data,
The self-station output unit using the reference data and the self-station data as output data to the self-station output unit to which the own station corresponds or input data from the own-station input unit to which the own station corresponds, Based on the lifetime detection result of the local station input unit, the reference station output unit to which the reference station corresponds, or the reference station input unit to which the reference station corresponds, data indicating a normal state or a lifetime alarm is indicated in the management data area A life detection method characterized by superimposing signals constituting data.
The reference data indicates a reference cumulative number of times that the reference station output unit or the reference station input unit is in an operation-on state or a reference cumulative time in which the reference station output unit or the reference station input unit is in an operation-on state. It is binary data, and the local station data is the cumulative number of times the local station output section or the local station input section is in an operation on state, or the local station output section or the local station input section is in an operation on state. It is binary data indicating the accumulated time of the own station,
The slave station includes output signal switching means,
The output signal switching means includes the reference cumulative number, the reference cumulative time, the local station cumulative number, or data corresponding to the local station cumulative time, and data indicating the normal state or data indicating the life warning. The life detection method according to claim 1, wherein the life detection method is switched and superimposed on the management data area.
The slave station superimposes a signal constituting data indicating the life warning when the reference accumulated number, the reference accumulated time, the own station accumulated number, and the own station accumulated time satisfy a predetermined logical condition. Item 3. The life detection method according to item 2.
The management data area includes a management control data area in which data from the master station is superimposed and a management monitoring data area in which data from the slave station is superimposed, and the management monitoring data area from the slave station The data superimposed on the data is determined as data other than “0”, and when the data extracted from the management monitoring data area in the master station is “0”, it is determined that the common data signal line is disconnected. Or the life detection method described in 3.
5. The life detection according to claim 1, 2, 3 or 4, wherein the reference data is control data or monitoring data for the local station output unit, or control data or monitoring data for the local station input unit. method.
Connected to the common data signal line to which the master station is connected,
The transmission signal transmitted to the common data signal line is provided with a management data area different from the control / monitor data area composed of control signal data and monitoring signal data,
The control data for the reference station or the monitoring data transmitted from the reference station is taken as reference data with a predetermined other station as a reference station, and the output data for the own station output section corresponding to the own station or the own station corresponding to the own station. Input data from a station input unit as own station data, using the reference data and the own station data, the own station output unit, the own station input unit, a reference station output unit corresponding to the reference station, or the reference Life detection means for detecting the life of the reference station input section to which the station corresponds;
A slave station terminal comprising: management monitoring data transmitting means for superimposing a signal constituting data indicating a normal state or data indicating a life warning on the transmission signal based on a detection result by the life detecting means .