JP2016149035A - Input PIO module and output PIO module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow a microcomputer in a PIO module to automatically detect and automatically handle a failure of a part of a transmission channel in such a case.SOLUTION: An input PIO module comprises a path changeover switch, an input/output circuit, and a microcomputer. The microcomputer sends a path change command to the path change switch on recognizing that an external signal s (s: an integer equal to or smaller than n) received through a second path s is illegal, and the path change switch once receiving the path change command that the microcomputer sends changes a connection opposite side of a primary-side contact n from a secondary-side contact n to a secondary-side contact n+1 and also changes a connection opposite side of a primary-side contact p (p: a variable satisfying n>p≥s) from a secondary-side contact p to a secondary-side contact p+1 when the integer s is smaller than the integer n, but change the connection opposition side of the primary-side contact n from the secondary-side contact n to the secondary contact n+1 when the integer s is equal to the integer n.SELECTED DRAWING: Figure 3

Description

  The present invention relates to automatic recovery of a failed transmission channel in an input PIO module and an output PIO module.

  PIO modules (Process Input Output modules: signal input / output devices) are widely used in control devices for thermal power plants and nuclear power plants (for example, Patent Document 1). The PIO module has a distinction between an output PIO module corresponding to digital output or analog output and an input PIO module corresponding to digital input or analog input. The input PIO module receives external data from the external device, and the output PIO module transmits command data to the external device.

  The plant monitoring and control system includes external devices such as a turbine, a boiler, and a servo valve. A command signal is issued from the operation room when these external devices are controlled. The command signal is input to the CPU master in the CPU panel via the plant network. The signal calculated by the CPU master is input to the PIO module attached to the PIO board via the communication line. A single current PIO module can control a plurality of points (multiple channels). For example, a 32-point digital input PIO module and an 8-point analog output PIO module have been developed.

  The PIO module includes a plurality of transmission channels, and if one of the channels fails, a component needs to be replaced with a new one. In order to cope with such a module failure, a spare channel is provided for each PIO module (for example, Patent Document 2). The operator always checks the soundness of each PIO module, and if a failure of the module is detected, the investigator switches to a normal module. In a PIO module that requires higher reliability, it is necessary to install the PIO module in a duplex configuration, which has been a factor in increasing costs.

JP 08-286703 A JP 59-077506

  The present invention has been made to solve the above-described problems, and is intended for a case where a part of a transmission channel fails. An object is to automatically detect the failure of the microcomputer in the PIO module, automatically switch the path of the corresponding channel to a backup path, and eliminate the need for new module replacement. Another object is to improve the reliability of a single PIO module.

  In the input PIO module according to the present invention, external data 1 to n are inputted to primary side contacts 1 to n (n: an integer of 2 or more), and first paths 1 to n + 1 are inputted to secondary side contacts 1 to n + 1. An input / output circuit that receives and converts external data 1 to n output from the connected path selector switch and secondary contacts 1 to n + 1 of the path selector switch; And a microcomputer that receives external signals 1 to n output from the output circuit via second paths 1 to n + 1, and the microcomputer passes through a second path s (s: integer less than or equal to n). When the received external signal s is recognized as illegal, it sends a path switching command to the path switching switch. When the path switching switch receives the path switching command transmitted by the microcomputer, if the integer s is smaller than the integer n, The connection partner of the secondary contact n is changed from the secondary contact n to the secondary contact n + 1, and the connection partner of the primary contact p (a variable satisfying p: n> p ≧ s) is changed from the secondary contact p. If it is changed to the secondary side contact p + 1 and the integer s is equal to the integer n, the connection partner of the primary side contact n is changed from the secondary side contact n to the secondary side contact n + 1.

  According to the input PIO module and the output PIO module of the present invention, even if a part of the transmission channel fails, the microcomputer in the module automatically detects the failure. Since the path of the corresponding channel is automatically switched to the backup path and no new module replacement is required, the reliability of the PIO module alone is improved.

BRIEF DESCRIPTION OF THE DRAWINGS It is a whole block diagram which shows the plant monitoring control system in this invention. It is a figure which shows the whole structure of the input PIO module by Embodiment 1 of this invention. It is a figure which shows the state of a path | route switch at the time of the failure of an input PIO module. It is a figure which shows the whole structure of the output PIO module by Embodiment 1 of this invention. It is a figure which shows the state of a path | route switch at the time of failure of an output PIO module. It is a figure which shows the whole structure of the input PIO module by Embodiment 2 of this invention. It is a figure which shows the whole structure of the output PIO module by Embodiment 2 of this invention. It is a figure which shows operation | movement of the path | route selector switch by Embodiment 2 of this invention. It is a figure which shows the whole structure of the PIO module by Embodiment 3 of this invention. It is a figure which shows operation | movement of the PIO module by Embodiment 4 of this invention. It is a figure which shows operation | movement of the PIO module by Embodiment 5 of this invention.

  A plant monitoring control system, an input PIO module, and an output PIO module according to an embodiment of the present invention will be described below with reference to the drawings. In each figure, the same or similar components are denoted by the same reference numerals, and the sizes and scales of the corresponding components are independent. For example, when the same components that are not changed are illustrated in cross-sectional views in which a part of the configuration is changed, the sizes and scales of the same components may be different. In addition, the configuration of the plant monitoring control system, the input PIO module, and the output PIO module actually includes a plurality of members. The part is omitted.

Embodiment 1 FIG.
Embodiment 1 of the present invention will be described below with reference to the drawings. FIG. 1 shows the positioning of a PIO module (signal input / output device: Process Input Output module) in the plant monitoring control system 100. A command signal is output from the operation room 201 when the external device 6 is controlled. The command signal is input to the CPU master 1 installed in the CPU panel 202 via the plant network 214. Signals calculated by the CPU master 1 are input to various PIO modules attached to the PIO board 203 via the communication line 215. External devices 6 such as a turbine 204, a boiler 205, a servo valve 206, and other devices 207 are connected to the PIO board 203.

  The DO (Digital Output) PIO module 210 and the AO (Analog Output) PIO module 212 convert the command signal received from the CPU master 1 into command data and output the command data to the external device 6. A DI (Digital Input) PIO module 209 and an AI (Analog Input) PIO module 211 attached to the PIO board 203 receive external data such as plant data from the external device 6, convert it into an external signal, and transfer it to the CPU master 1. send. Each PIO module can control multiple points (multiple channels). For example, a 32-point digital input PIO module, an 8-point analog output PIO module, or the like is used.

  FIG. 2 shows an internal circuit configuration of the input PIO module 2 corresponding to automatic failure recovery. The input PIO module 2 includes a reserved channel RSV (Reserved) as a transmission channel in addition to the channels CH1 to CH8. The CPU master 1 transmits a master command 14 to the microcomputer (microcomputer) 3 and receives a master notification 13 transmitted from the microcomputer 3. First paths L1a to L9a are formed between the path switch 5 and the input / output circuit 4. Second paths L1b to L9b are formed between the microcomputer 3 and the input / output circuit 4. External data D1a to D8a for eight channels is output from the external device 6 to the input PIO module 2. The external data D1a to D8a are taken into the microcomputer 3 via the channels CH1 to CH8 and the spare channel RSV.

  When any one of the channels CH1 to CH8 fails, the input PIO module 2 continues transmission using the spare channel RSV. External data D1a to D8a transmitted from the external device 6 is read into the input / output circuit 4 via the path switch 5. The input / output circuit 4 includes an operational amplifier, an ADC (Analog to Digital Converter), a DAC (Digital to Analog Converter), a relay, a photocoupler, and the like, and converts external data D1a to D8a into external signals D1b to D8b. The microcomputer 3 creates the master notification 13 based on the read external signals D1b to D8b. The master notification 13 is transmitted to the CPU master 1 via the communication line 215. The path switching command 11 is transmitted from the microcomputer 3 to the path switching switch 5, and the state notification 12 is transmitted from the path switching switch 5 to the microcomputer 3.

  The path changeover switch 5 includes primary side contacts P1 to P8 to which external data from an external device is input, and secondary side contacts S1 to S9 connected to the first paths L1a to L9a. The primary side contacts P <b> 1 to P <b> 8 of the path changeover switch 5 can be switched between two contact points. For example, the primary side contact P1 can be connected to the secondary side contact S1 or the secondary side contact S2. Similarly, the primary side contact P2 can be connected to the secondary side contact S2 or the secondary side contact S3. The primary side contact P3 can be connected to the secondary side contact S3 or the secondary side contact S4. The primary side contact P4 can be connected to the secondary side contact S4 or the secondary side contact S5. The primary side contact P5 can be connected to the secondary side contact S5 or the secondary side contact S6. The primary side contact P6 can be connected to the secondary side contact S6 or the secondary side contact S7. The primary side contact P7 can be connected to the secondary side contact S7 or the secondary side contact S8. The primary side contact P8 can be connected to the secondary side contact S8 or the secondary side contact S9.

  Here, it is assumed that a failure 9 occurs in the input / output circuit 4 in the data line of the channel CH1 as shown in FIG. Since the external signal D1b received through the channel CH1 is interrupted by the microcomputer 3, the microcomputer 3 transmits a path switching command 11 to the path switch 5 in order to recognize the data of the channel CH1 as illegal. Then, the path changeover switch 5 first switches the primary side contact P8 farthest from the failure data line to the secondary side contact S9 of the RSV line. Thereafter, the primary side contact P7 transitions to the secondary side contact S8, the primary side contact P6 transitions to the secondary side contact S7,..., And the primary side contact P1 transitions sequentially to the secondary side contact S2. That is, when a failure occurs in the input / output circuit 4 in the data line of the channel CHs, the connection partner of the primary side contact Ps is changed from the secondary side contact Ss to the secondary side contact Ss + 1 for a channel larger than the integer s. . The secondary side contact S1 in the failure data line is disconnected from the outside.

  However, when a failure occurs in the input / output circuit 4 in the data line of the channel CH8, it is only necessary to change the connection partner of the primary side contact P8 from the secondary side contact S8 to the secondary side contact S9. At the same time, the state of the path changeover switch 5 is transmitted to the microcomputer 3 as the state notification 12, and the reading table stored in the microcomputer 3 is changed. As a result, in the microcomputer 3, the channel CH1 is invalid, the channel CH2 is the data line of the channel CH1, the channel CH3 is the data line of the channel CH2, the channel CH4 is the data line of the channel CH3, the channel CH5 is the data line of the channel CH4, and the channel CH6. Is a data line of channel CH5, channel CH7 is a data line of channel CH6, channel CH8 is a data line of channel CH7, and spare channel RSV is a data line of channel CH8. This series of changes is transmitted to the CPU master 1 as a master notification 13.

  FIG. 4 shows the internal circuit configuration of the output PIO module 7 corresponding to automatic failure recovery. The output PIO module 7 includes a reserved channel RSV (Reserved) in addition to the channels CH1 to CH8. The CPU master 1 transmits a master command 14 to the microcomputer (microcomputer) 3 and receives a master notification 13 transmitted from the microcomputer 3. First paths L1c to L9c are formed between the microcomputer 3 and the input / output circuit 4. Between the path switch 5 and the input / output circuit 4, second paths L1d to L9d are formed. The command signals D1c to D8c are output from the microcomputer 3 to the input / output circuit 4 via the channels CH1 to CH8 and the spare channel RSV. The path switch 5 includes primary side contacts P1 to P8 and secondary side contacts S1 to S9.

  The input / output circuit 4 includes an operational amplifier, an ADC (Analog to Digital Converter), a DAC (Digital to Analog Converter), a relay, a photocoupler, and the like, and converts the command signals D1c to D8c into command data D1d to D8d. In the output PIO module 7, since the microcomputer 3 cannot directly recognize that the output signal has become illegal due to the failure of the input / output circuit 4, the feedback circuit 8 transmits a command transmitted via the channels CH1 to CH8. Data D1d to D8d (feedback signal 15) is transmitted to microcomputer 3 as output recognition notification 16. The command data D1d to D8d are output to the external device 6. The external device 6 adjusts its own state based on the transmitted command data D1d to D8d for eight channels.

  Here, it is assumed that a failure 9 occurs in the input / output circuit 4 in the data line of the channel CH1 as shown in FIG. Since the microcomputer 3 cannot directly recognize that the output signal of the input / output circuit 4 has become illegal in the output PIO module 7, the command data D1d to D8d corresponding to the channels CH1 to CH8 of the external device 6 are simultaneously fed back to the feedback signal 15 Is transmitted to the microcomputer 3 via the feedback circuit 8. When the input / output circuit 4 in the data line of the channel CH1 fails, the microcomputer 3 recognizes it through the output recognition notification 16, and the path is sequentially switched. In the present invention, the spare path is installed in the same PIO module in units of channels. Detection and switching of the failure location is automatically performed by the input PIO module and the output PIO module.

  That is, the input PIO module according to the present embodiment has an input circuit failure detection function that detects from the input signal which path has failed when a circuit on the input / output signal path fails, and a path when the circuit fails. It has a path switching control function for sequentially switching and a path status notification function for transmitting path information to a higher level when a path is switched. The output PIO module according to the present embodiment includes a feedback function that feeds back an output signal to a microcomputer when a circuit on the input / output signal path fails, and an output circuit that detects which path has failed from the feedback signal. It has a failure detection function, a path switching control function for sequentially switching paths when a failure occurs, and a path status notification function for transmitting path information to a higher level when a path is switched.

Embodiment 2. FIG.
In the first embodiment, a case has been described in which a spare channel RSV is provided in a transmission channel, so that when a circuit for one channel fails, a data path can be automatically switched and recovered. In the second embodiment, a path changeover switch that can switch between contact and disconnection of the other party is used, and a spare channel RSV is provided under each channel. Since half of the secondary side contacts S1 to S8 are allocated to the backup path (or backup channel RSV), the switching pattern can be varied. If it is connected to an external device through a route for four channels, eight secondary contacts are required for four primary contacts.

  FIG. 6 shows the internal configuration of the input PIO module. The path switch 5 includes primary side contacts P1 to P4 and secondary side contacts S1 to S8. The primary side contact P1 of the path switch 5 can be connected to the secondary side contact S1, the secondary side contact S2, and the secondary side contact S3. The primary side contact P2 of the path switch 5 can be connected to the secondary side contact S3, the secondary side contact S4, and the secondary side contact S5. The primary contact P3 of the path switch 5 can be connected to the secondary contact S5, the secondary contact S6, and the secondary contact S6. The primary side contact P4 of the path switch 5 can be connected to the secondary side contact S6, the secondary side contact S7, and the secondary side contact S8. The secondary side contact S2, the first path L2a, and the second path L2b constitute a backup channel RSV1. The secondary side contact S4, the first path L4a, and the second path L4b constitute a backup channel RSV1. The secondary side contact S6, the first path L6a, and the second path L6b constitute a backup channel RSV3. The secondary side contact S8, the first path L8a, and the second path L8b constitute a backup channel RSV4.

  FIG. 7 shows the internal configuration of the output PIO module. The path changeover switch 5 is connected to an external device through a path for 4 channels for transmitting and receiving data. The primary side contact P1 of the path switch 5 can be connected to the secondary side contact S1, the secondary side contact S2, and the secondary side contact S3. The primary side contact P2 of the path switch 5 can be connected to the secondary side contact S3, the secondary side contact S4, and the secondary side contact S5. The primary contact P3 of the path switch 5 can be connected to the secondary contact S5, the secondary contact S6, and the secondary contact S7. The primary side contact P4 of the path switch 5 can be connected to the secondary side contact S6, the secondary side contact S7, and the secondary side contact S8. The first path L2c, the second path L2d, and the secondary side contact S2 constitute a backup channel RSV1. The first path L4c, the second path L4d, and the secondary side contact S4 constitute a backup channel RSV2. The first path L6c, the second path L6d, and the secondary side contact S6 constitute a spare channel RSV3. The first path L8c, the second path L8d, and the secondary side contact S8 constitute a spare channel RSV4.

  Next, the operation of the path changeover switch 5 in this embodiment will be described with reference to FIGS. 8A, 8B, and 8C. When normal, the primary side contact P1 and the secondary side contact S1 are connected to form a channel CH1. Similarly, the primary side contact P2 and the secondary side contact S3 are connected to form a channel CH2. Similarly, the primary side contact P3 and the secondary side contact S5 are connected to form a channel CH3. Similarly, the primary side contact P4 and the secondary side contact S7 are connected to form a channel CH4 (see FIG. 8A). First, when the circuit (data line) of the channel CH1 fails and then the circuit of the spare channel RSV1 fails (at the time of failure A), the primary side contact P2 goes to the secondary side contact S4, and the primary side contact P1 goes to the second side. Transition to the next contact S3 (see FIG. 8B). Further, when the circuit of the secondary side contact S4 of the channel CH2 fails, the channel CH3 transits to the secondary side contact S6, and the channel CH2 transits to the secondary side contact S5. Furthermore, when the circuit of the secondary side contact S6 of the channel CH3 fails (at the time of failure B), the channel CH3 transitions to the secondary side contact S7, and the channel CH4 transitions to the secondary side contact S8 (see FIG. 8C).

  That is, the (input / output) PIO module according to the present embodiment has a multi-contact path switching control function for switching and controlling the multi-contact path switching switch in various patterns. Thus, according to the present embodiment, by providing a switch that can be switched to a plurality of contacts and a plurality of spare paths, the switching pattern at the time of failure can be diversified and the reliability can be greatly improved.

Embodiment 3 FIG.
In the first embodiment, the path switching by a single PIO module has been described. In the third embodiment, an I system (input / output) PIO module and an II system (input / output) PIO module are provided, and the input PIO module and the output PIO module are multiplexed. As a result, when the number of failed channels in one control PIO module increases, control can be automatically transferred to the other standby PIO module. PIO modules with frequent failures can be replaced.

  FIG. 9 shows an internal circuit configuration of the (input / output) PIO module corresponding to the present embodiment. In order to perform multiplexing, an enable circuit 19a is provided at a subsequent stage of the path switch 5a of the I-system (input / output) PIO module 17. Similarly, the enable circuit 19b is provided in the subsequent stage of the path switch 5b of the II system (input / output) PIO module 18. Currently, the I-system PIO module 17 is in the control state and the II-system PIO module 18 is in the standby state. In the I-system input PIO module and the I-system output PIO module, the microcomputer 3a refers to the first embodiment or the second embodiment to monitor a path failure. The microcomputer 3a transmits a microcomputer command 23 from the I system to the II system, and the microcomputer 3b transmits a microcomputer command 24 from the II system to the I system.

  In the I-system PIO module 17, it is assumed that a plurality of channel paths have failed and the remaining spare paths are reduced. The microcomputer 3a transmits a stop command 21 to the enable circuit 19a to stop the control of the I-system PIO module 17. At the same time, a control takeover command (microcomputer command 23) is transmitted from the microcomputer 3a of the I-system PIO module 17 to the microcomputer 3b of the II-system PIO module 18. An enable command 22 is transmitted from the microcomputer 3b to the II system enable circuit 19b, and control of the II system PIO module 18 is started. The microcomputer 3a transmits to the CPU master 1 information (master notification 13) indicating that the system has been switched simultaneously.

  That is, the PIO module according to the present embodiment has a multiplexed PIO module control function that multiplexes using a plurality of PIO modules in addition to the functions of the first and second embodiments, and one PIO has a fault on the module. A failure detection function that detects that the number of paths has increased, a failure detection output stop function that disables the enable circuit when detected, a control takeover notification function that takes over control to the other microcomputer when detected, In response to the notification, it has a function to start control of another system to enable the enable circuit.

Embodiment 4 FIG.
In the second embodiment, a failure is allowed for the number of spare paths provided. In the fourth embodiment, a multiplexer (MPX) is provided after the path switch 5 of the input PIO module. Further, a multiplexer (MPX) with a hold function is provided at the subsequent stage of the path changeover switch 5 of the output PIO module. The multiplexer is a mechanism for outputting two or more inputs as one signal. In contrast to the multiplexer, the demultiplexer is a mechanism that switches a signal divided by the transmitted time and sends it to a plurality of transmission lines. As a result, normal operation can be continued in all channels even when a failure more than the number of backup paths occurs and the backup path is blocked.

  10A and 10B show the internal circuit configuration of the (input / output) PIO module corresponding to automatic failure recovery. The multiplexer 25 has a function of holding an arbitrary contact, and executes multiplexing in the input PIO module and demultiplexing in the output PIO module. Currently, data transmission for three channels is performed in the input PIO module and the output PIO module. When a circuit in the channel CH1 fails and a circuit in the channel CH2 below it also fails, the number of failed data lines is larger than the number of backup paths. The path changeover switch 5 switches the primary side contact P1 and the primary side contact P2 to the same secondary side contact, and the channel CH1 and the channel CH2 use the same data line together. Channel CH3 transitions to spare channel RSV, and external data and command data pass through channel CH3.

  When the same data line is used together, the status notification 12 is transmitted to the microcomputer 3, and the microcomputer 3 instructs the multiplexer 25 to switch between enabling and disabling alternately for the channels CH1 and CH2. 26 is transmitted. At the same time, the microcomputer 3 alternately performs reading as the channel CH1 and reading as the channel CH2 in accordance with this timing. In the case of an output PIO module, since it is necessary to hold data when controlling other channels, a multiplexer with a hold function is used. The microcomputer 3 multiplexes the command signals transmitted to the channels CH1 and CH2 and sends them to the input / output circuit 4. The path changeover switch 5 and the multiplexer 25 demultiplex the transmitted command data and output it to different data lines.

  In other words, in addition to the functions of the first and second embodiments, the PIO module according to the present embodiment includes the same contact switching function that uses the same data line when a failure more than the backup path occurs, and a plurality of the same data lines. A multi-channel signal selection function that multiplexes these signals, and a channel selection synchronization recognition function that the microcomputer reads and writes in accordance with the timing selected by the multiplex.

Embodiment 5 FIG.
In the first to fourth embodiments, automatic recovery at the time of failure has been described. These functions can also be used as a method for checking the soundness of the channels in the input PIO module and the output PIO module during normal operation. In FIG. 11, a channel CH1, a channel CH2, and a spare channel RSV are formed between the microcomputer 3 and the input / output circuit 4. The primary side contact P1 can select any one of the secondary side contact S1, the secondary side contact S2, and the secondary side contact S3 to select the channel CH1. First, the soundness of the channel CH1 during normal operation is checked. Similarly, the soundness during normal operation is checked for the channel CH2 related to the secondary contact S2, and the soundness during normal operation is checked for the standby channel RSV related to the secondary contact S3.

  When checking, the microcomputer 3 sends an all-path switching command 11a to the path switching switch 5 in order to perform path switching for all possible combinations of primary side contacts and secondary side contacts. In the pattern 1, the channel CH1 is formed via the secondary side contact S1. In the pattern 2, the channel CH1 is formed via the secondary side contact S2. In the pattern 3, the channel CH1 is formed via the secondary side contact S3. In this way, the signal path of each channel including the channel CH1 is periodically switched from pattern 1 to pattern 3. As a result, it is possible to check the soundness of each path such as the accuracy confirmation of the digital / analog conversion in the input / output circuit 4. When there is a problem with soundness, the CPU master 1 is notified and transmitted to the operation room 201.

  That is, the PIO module according to the present embodiment has a periodic path switching soundness check function for checking the soundness of all the paths by switching each channel path even in a normal state in addition to the functions of the first to fourth embodiments. , Has a soundness notification function that tells the host when soundness problems occur.

  It should be noted that the present invention can be freely combined with each other within the scope of the invention, and each embodiment can be appropriately modified or omitted.

  1 CPU master, 2 input PIO module, 3 microcomputer, 4 input / output circuit, 5 path switch, 6 external device, 7 output PIO module, 8 feedback circuit, 9 failure, 11 path switch command, 12 status notification, 13 master notification , 14 master command, 15 feedback signal, 16 output recognition notification, 17 I system PIO module, 18 II system PIO module, 19a enable circuit, 19b enable circuit, 23 microcomputer command, 24 microcomputer notification, 25 multiplexer, 26 combination command, 100 Plant monitoring and control system, 201 operation room, 202 CPU panel, 203 PIO panel, 204 turbine, 205 boiler, 206 servo valve, 207 other equipment, 214 plant network, 215 communication line

Claims (10)

External path 1 to n is input to primary side contacts 1 to n (n is an integer of 2 or more), and a path changeover switch in which first paths 1 to n + 1 are connected to secondary side contacts 1 to n + 1,
When receiving external data 1 to n output from the secondary contacts 1 to n + 1 of the path switch, an input / output circuit that converts the external data 1 to n and outputs the external data 1 to n;
A microcomputer for receiving the external signals 1 to n output from the input / output circuit via the second paths 1 to n + 1,
When the microcomputer recognizes that the external signal s received via the second path s (s: an integer less than or equal to n) is illegal, it sends a path switching command to the path switch,
When the path changeover switch receives a path changeover instruction transmitted by the microcomputer,
If the integer s is smaller than the integer n, the connection partner of the primary contact n is changed from the secondary contact n to the secondary contact n + 1, and the primary contact p (p: variable satisfying p>n> p ≧ s). The connection partner is changed from the secondary contact p to the secondary contact p + 1,
If the integer s is equal to the integer n, the connection partner of the primary side contact n is changed from the secondary side contact n to the secondary side contact n + 1. A microcomputer for transmitting command signals 1 to n (n: an integer of 2 or more) via the first paths 1 to n + 1;
An input / output circuit that receives the command signals 1 to n transmitted from the microcomputer and converts the command signals 1 to n into command data 1 to n and outputs the command data 1 to n + 1;
Primary side contacts 1 to n and secondary side contacts 1 to n + 1 are provided, and second paths 1 to n + 1 are connected to the secondary side contacts 1 to n + 1, and command data 1 is output from the primary side contacts 1 to n. A path selector switch for outputting ~ n;
A feedback circuit for inputting the command data 1 to n output from the primary side contacts 1 to n of the path switch and transmitting an output recognition notification to the microcomputer based on the command data 1 to n;
When the microcomputer recognizes the command data s (s: integer less than or equal to n) from the output recognition notification sent by the feedback circuit as being illegal, it sends a route switch command to the route switch,
When the path changeover switch receives a path changeover instruction transmitted by the microcomputer,
If the integer s is smaller than the integer n, the connection partner of the primary contact n is changed from the secondary contact n to the secondary contact n + 1, and the primary contact p (p: variable satisfying p>n> p ≧ s). The connection partner is changed from the secondary contact p to the secondary contact p + 1,
If the integer s is equal to the integer n, the connection partner of the primary side contact n is changed from the secondary side contact n to the secondary side contact n + 1. External path 1 to n is input to the primary side contacts 1 to n (n: an integer of 2 or more), and the path selector switch in which the first paths 1 to 2n are connected to the secondary side contacts 1 to 2n,
An input / output circuit that receives external data 1 to n output from the secondary contacts 1 to 2n of the path changeover switch, converts the external data 1 to n and outputs the external data 1 to n;
A microcomputer for receiving the external signals 1 to n output from the input / output circuit via the second paths 1 to 2n,
When the microcomputer recognizes that the external data s received via the second path 2s-1 (s: an integer smaller than n) is illegal, it sends a path switch command to the path switch,
When the path switching command is received by the microcomputer, the path switching switch changes the connection partner of the primary side contact s from the secondary side contact 2s-1 to the secondary side contact 2s or the secondary side contact 2s + 1. An input PIO module characterized by the following. A microcomputer for transmitting the command signals 1 to n via the first paths 1 to 2n (n: an integer of 2 or more);
An input / output circuit that receives command signals 1 to n transmitted from the microcomputer and converts the command signals 1 to n into command data 1 to n and outputs the command data 1 to 2n;
The primary side contacts 1 to n and the secondary side contacts 1 to 2n are provided. The secondary side contacts 1 to n are connected to the second paths 1 to 2n. A path selector switch for outputting ~ n;
A feedback circuit for inputting the command data 1 to n output from the primary side contacts 1 to n of the path switch and transmitting an output recognition notification to the microcomputer based on the command data 1 to n;
When the microcomputer recognizes that the command data s (s: an integer smaller than n) is illegal from the output recognition notification transmitted by the feedback circuit, the microcomputer transmits a path switching command to the path switching switch,
When the path switching command is received by the microcomputer, the path switching switch changes the connection partner of the primary side contact s from the secondary side contact 2s-1 to the secondary side contact 2s or the secondary side contact 2s + 1. An output PIO module characterized by the above. When external data 1-n is received from an external device, the external data 1-n is provided with an enable circuit for outputting to the primary contacts 1-n of the path switch,
The enable circuit includes:
When a stop command is received from the microcomputer, the output of the external data 1 to n to the path switch is stopped,
4. The input PIO module according to claim 1, wherein when an enable command is received from the microcomputer, output of external data 1 to n to the path switch is started. 5. When receiving command data 1 to n output from the primary side contacts 1 to n of the path switch, an enable circuit for transmitting the command data 1 to n to an external device is provided.
The enable circuit includes:
When receiving a stop command from the microcomputer, the transmission of the command data 1 to n output from the path switch to the external device is stopped,
5. The output PIO module according to claim 2, wherein when an enable command is received from the microcomputer, transmission of command data 1 to n output from the path switch to an external device is started. When external data 1 to n is received from an external device, the external data 1 to n are provided with a multiplexer that outputs the external data 1 to n to the primary contacts 1 to n of the path switch,
4. The input PIO module according to claim 1, wherein when the microcomputer recognizes the received external signal as illegal, the microcomputer issues a combination command to the multiplexer. 5. It has a hold function, and when receiving command data 1 to n output from the primary side contacts 1 to n of the path changeover switch, it includes a multiplexer that transmits the command data 1 to n to an external device,
5. The output PIO module according to claim 2, wherein when the microcomputer recognizes the received external signal as illegal, the microcomputer issues a combination command to the multiplexer.   The path switching switch, when receiving an all path switching command from the microcomputer, sequentially switches the connection partners of the primary side contacts 1 to n and checks the soundness of the channel. The input PIO module according to any one of 5 and 7.   The path switching switch, when receiving an all path switching command from the microcomputer, sequentially switches connection partners of the primary side contacts 1 to n to check the soundness of the channel. The output PIO module according to any one of 6 and 8.

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