JPH10198405A - Sequence control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To sharply shorten manhour required for a simulation test for checking the operation of a control program and to surely check the operation of the control program at the time of executing the simulation test. SOLUTION: In the sequence control device 302 having a controller 3 for automatically controlling the sequential operation of a plant to be controlled and one or more modules 5 for protecting and driving one or more plant auxiliary machines(PAMs) 309, a controller testing program is built in each module 5, a testing simulation mode for checking validity in the contents of control and the contents of protection and drive in a state connecting no PAM is set up in each PAM 309, a testing response signal is fed back to an operation command outputted to the PAM 309, the simulation mode is sent to the controller 3 to execute batch management of the simulation mode, and the existence of a PAM 309 in simulation is displayed on a monitor 204.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sequence control device used for a simulation test for confirming the operation of a control program before a sequence control device is connected to a plant auxiliary machine.

[0002]

2. Description of the Related Art In order to confirm the operation of a control program before connecting a sequence control device to an auxiliary plant, conventionally, a test simulation signal generating device is connected to an input / output device of the sequence control device. That is being done. For this reason, a circuit that returns a feedback signal in response to an operation command (hard output) of the sequence control device by laying a cable has been formed by hardware. This type of technique is described in Japanese Patent Application Laid-Open No. Hei 7-13612.

[0003]

As described above, since a circuit for returning a feedback signal to a control program of a sequence control device is conventionally constructed by hardware, an enormous number of man-hours (for example, for a power generation plant). Boiler, turbine sequence controller 15 people * 20
Days). Further, there is a need to check all points of the cable wiring and a possibility of erroneously recognizing the operation of the control program due to erroneous wiring. In addition, for example, even in the case of a plant auxiliary machine that takes several seconds to several minutes from when an operation command is output to when the operation is completed, such as an ON / OFF type electric valve, a feedback signal is returned at the same time as the operation command is output. There was a phenomenon that did not fit the reality.

An object of the present invention is to significantly reduce the man-hour required for a simulation test when a simulation test for confirming the operation of a control program is performed before a sequence control device is connected to a plant auxiliary machine. It is another object of the present invention to provide a sequence control device suitable for surely confirming the operation of a control program.

[0005]

An object of the present invention is to provide a sequence control apparatus having a control device for automatically performing a sequential operation of a plant to be controlled and a processing device for protecting and driving one or more plant auxiliary machines. In addition, a control device test program is incorporated in the processing device, and a test simulation mode for confirming the validity of the control contents, protection and drive contents in a state where the plant auxiliary device is not connected is set for each plant auxiliary device, The problem is solved by feeding back a test response signal to an operation command output to the plant auxiliary. Further, the problem is solved by transmitting a test simulation mode set for each plant auxiliary machine to the control device, collectively managing the test simulation mode, and displaying the presence or absence of the plant auxiliary machine being simulated on a monitor. Here, when the control device test program receives the operation command, if the test simulation mode is being set, the control device test program stores the operation command to the plant auxiliary equipment, and responds after receiving the operation command during normal operation. In the case of a plant auxiliary machine that requires a certain period of time until the signal is fed back, after a few seconds to a few minutes elapse, feedback as a test simulated response signal of the operation command,
In the case of a plant auxiliary machine which receives an operation command during normal operation and instantaneously feeds back a response signal, the feedback is instantaneously fed back as a test simulation response signal of the operation command.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 shows a configuration of a power plant control device including the sequence control device of the present invention. The power plant control device includes a sequence control device 302, an automatic control device 303 that adjusts the amount of fuel and water used in accordance with the amount of power generation, and various devices that make up the power plant, such as valve opening, temperature, and pressure. A common input / output panel 304 having a circuit for collectively inputting state quantities and creating conditions to be used in peripheral control devices, and a central operation room 305 are installed, and an operator visually judges the state of the power plant. Operating device 306 for operating the various devices by operating the touch panel, and also installed in the central operation room 305 to record the operating state of the power plant and the operating time of the various devices, and to provide details of alarms. Unit calculator 3 to display
07 and various devices including these are connected via a transmission network 301. When connecting the power generation plant control device to the power generation plant 308, the sequence control device 302 connects with a plant auxiliary device 309 such as a pump / fan, an electric valve, or a solenoid valve by a cable 310, and issues a command to open or close the valve. It mainly deals with operation commands and status signals such as start and stop as digital signals. In addition, the automatic control device 303 and the common input / output panel 304 mainly exchange state quantities such as valve opening, temperature, and pressure as analog signals through a cable 310 with an instrumentation panel 311 in the power plant.

FIG. 1 shows details of a sequence control device 302 according to an embodiment of the present invention. The sequence control device 302 includes the control device 3, the bus 4, and the module 5, and is connected to the maintenance / monitoring device 6 through the bus 4. First, the control device 3 will be described. For example, when water is to be filled to wash the inside of the boiler main body (not shown) with water, the valve of the drainage system of the boiler is closed, and the water supply pump is operated after opening the outlet valve of the water supply pump. Water in the boiler body. When the state of the power plant is changed in this manner, various auxiliary devices (valves, pumps) organically connected to the main body (boiler body) are operated in a predetermined order toward a predetermined state. Let it. The control device 3 includes a memory 7 for storing the content of such control,
It comprises a CPU 8 that reads out the contents of the memory 7 and performs calculations. Next, the module 5 structurally includes a memory 9 for storing a program, an MPU 10 for reading and operating the contents of the memory 9, an input device 11, and an output device 1.
It consists of two. The auxiliary equipment drive signal 13 to the plant auxiliary equipment 309 such as a pump / fan, an electric valve, a solenoid valve, etc., is calculated by the CPU 8 in the control device 3, via the bus 4, the MPU 10 in the module 5, or in the module 5. The result of the operation of the MPU 10 is output from the output device 12 of the module 5. The response signal 14 of the accessory drive signal 13 is input to the input device 11 of the module 5.
Note that the meaning of “drive” used in the present embodiment includes not only opening or starting the plant auxiliary equipment but also closing or stopping it. The maintenance / monitoring device 6 has a function for performing maintenance / monitoring of the control device 3 and the module 5. The maintenance / monitoring device 6 is a CPU
It comprises a memory 201, a memory 202, a bus 203 and a monitor 204, and is connected to the control device 3 and / or the module 5. The CUP 201 implements a function for maintenance and monitoring by executing a program stored in the memory 202. For example, the maintenance / monitoring device 6 has a function of accessing the control device 3 or the module 5 through the bus 4 and rewriting the content stored in the memory 7 or the memory 9. In addition, the control device 3
And a function of acquiring information on the operation state of the module 5 and displaying the information on the monitor 204.

FIG. 3 shows blocks for explaining the function of the module 5. The module 5 is provided for each of one or two or more plant auxiliaries, and functionally includes a normal drive condition processing function 15.
, Protection drive condition processing function 16, and auxiliary drive function 12
And a control device test program 17. The normal drive condition processing function 15 generates a drive permission condition for the auxiliary machine necessary for performing a normal operation of the plant, and determines whether the drive permission condition is satisfied. The protection drive condition processing function 16 drives auxiliary equipment to protect main equipment of the plant when any abnormality occurs. When an abnormality occurs, the protection drive condition processing function 16 ignores the drive permission condition and forcibly instructs the accessory drive function 12 to drive. The accessory drive function 12 outputs a drive signal to the accessory. Normally, a drive signal is output when the drive condition is satisfied as a result of the determination by the normal drive condition processing function 15. However,
In the event of any abnormality, a drive signal is output according to a drive instruction from the protection drive condition processing function 16. The control device test program 17 converts the control device 302 into a plant auxiliary machine 309.
This is used to confirm the validity of the operation of the control device 302 at a stage before the connection with the control device 302. Control device test program 17
Is implemented by software to realize a flowchart described later, is stored in a part of the memory 9, and is operated by the MPU 10. The normal driving condition processing function 15, the protection driving condition processing function 16, the auxiliary device driving function 12, and the control device test program 17 which are the functions of the module 5 will be described in relation to the structure of the module 5.
5, a protection drive condition processing function 16, and a control device test program 17 are stored in the memory 9 (see FIG. 1).
And the auxiliary device driving function 12 is the output device 12.

Next, the operation of the plant control using the control device 3 and the module 5 will be described. When the sequence control device 302 is connected to the plant accessory 309, the module 5 includes a status signal 18 indicating the state of the plant accessory 309 and a response signal 14 of the accessory drive signal 13 described later.
Are input from the plant auxiliary machine 309. Module 5
The control device 3 outputs the state signal 18 and the response signal 14 as they are.
As a condition signal 19. This condition signal 19 is
This is a signal that is used as a judgment material for the control device 3 to analyze the state of the plant. In addition to this, the accessory drive permission signal 20 and the protection drive lock signal 21 are input to the module 5 from the plant accessory 309. This accessory drive permission signal 20
Are criteria and conditions for determining whether or not the accessory control signal 22 described later can normally operate the accessory. The actual accessory drive permission signal 20 includes, for example, an operation state of another related accessory, a plant state signal, and the like. The control device 3 analyzes the state of the plant based on the content of the condition signal 19 and the like. As a result of the analysis, for a plant accessory that needs to perform some operation, the accessory control signal 2 is transmitted to the module 5 associated with the plant accessory.
2 is output. In the module 5, the normal drive condition processing function 15 determines that the content of the input accessory control signal 22 is
It is determined whether or not the criterion and condition indicated by the accessory drive permission signal 20 are satisfied. As a result of the determination, if the criterion is satisfied, the signal is output to the control device test program 17 as an operation command 23. The operation command 23 is generally of two types, a start command and a stop command or an open command and a close command, but may be three or more as long as they are mutually exclusive. Further, in the protection driving condition processing function 16 of the module 5, even when the protection driving lock signal 21 is input from the plant auxiliary machine 309, the processing content of the normal driving condition processing function 15 is ignored and the operation command 23 is forcibly performed. Is output to the control device test program 17. In the control device test program 17,
The test simulation mode 24 is set or released by the maintenance / monitoring device 6. In the test simulation mode 24, before the sequence control device 302 is connected to the plant auxiliary machine 309, the control content stored in the memory 7 (see FIG. This is set at the time of a simulation test for confirming the validity of the normal drive condition processing function 15 and the protection drive condition processing function 16 stored in (see FIG. 1). When the sequence control device 302 is connected to the plant auxiliary machine 309 to perform the normal operation, the test simulation mode 24 is released, and the control device test program 17 directly transmits the operation command 23 to the auxiliary machine drive function. 12 is output. At this time, the accessory drive function 12 outputs an accessory drive signal 13 to the plant accessory 309 to drive the accessory based on the operation command 23. The result of the operation of the plant accessory 309 having received the accessory drive signal 13 is input to the control device test program 17 as a response signal 14 of the accessory drive signal 13. The control device test program 17 converts the response signal 14 as it is into the condition signal 19
Is output to the control device 3.

FIGS. 4 and 5 show a flowchart of the control device test program 17. FIG. FIG. 4 is a flowchart in the case where the type of the plant auxiliary equipment 309 targeted for the operation instruction is the motor-operated valve, and FIG. 5 is the flowchart in the case where the type of the plant auxiliary equipment 309 targeted for the operation instruction is the pump / fan or the solenoid valve. It is a flowchart. First, the operation command 23
In response to (see FIG. 3), it is determined whether or not the test simulation mode 24 (see FIG. 3) is being set (101). When the test simulation mode 24 is being set, the plant auxiliary machine 309
It is determined whether or not the operation command (see FIG. 3) is the first time (1).
02). When the operation command to the plant auxiliary machine 309 is the first time, the current operation command is stored (103). If the operation command to the plant auxiliary machine 309 is not the first time, the current operation command is stored, and if the operation command of the discharge is stored, it is deleted (104). When the plant auxiliary machine 309 targeted for the operation command is a motor-operated valve, the process proceeds to step 107 after several seconds to several minutes (106) as shown in FIG. When the plant accessory 309 targeted for the operation command is a pump / fan or a solenoid valve, as shown in FIG.
Proceed to 07. In Step 107, Step 10
3 or the operation command stored in step 104 is output from the program 17 as a test simulation response signal, and the control device 3 receives this signal as the condition signal 19. As a result, in response to the operation command 23, the response signal 1 of the operation command 23
4 can be returned in a simulated manner. In addition, by using the control device test program properly according to the type of the auxiliary equipment, a test simulation response signal close to the actual operation can be obtained. Next, when the test simulation mode 24 is not being set, an operation command is output to the accessory drive function (output device) 12 (see FIG. 3) (108). As a result, the accessory drive signal 1
3 (see FIG. 3) is output to the plant auxiliary machine 309. Further, the response operation (11
0) is input to the program 17 through the input device 11 (see FIG. 1) (10).
9). When the test simulation mode 24 is not being set, the program 17 transmits the feedback signal 14 as it is to the control device 3 as the condition signal 19.

FIG. 6 shows the control device test program 17 by hardware for easy understanding. FIG.
, 27-1 and 27-2 are changeover switches, and 25-
1, 25-2 are flip-flops, 26-1, 26-2
Represents an on-delay timer. In this case, the operation command 23
-1 and 23-2 are mutually exclusive. Also, three or more operation commands 23 may be provided as long as they are mutually exclusive.
When the signal of the operation command 23-1 is established, the flip-flop 25-1 is set 405 and its output 407 is established. At the same time, the input 408 of the on-delay timer 26-1
Is established, and the output 409 is established after a predetermined time. When the test simulation mode 24 is set, the input 404 of the changeover switch 27-1 is established, and the input signal on the 401 side is output to 403. As a result, it is possible to simulate the response signal 14-1 of the operation command 23-1 in response to the operation command 23-1. When the signal of the operation command 23-2 is established,
Similarly, when the test simulation mode 24 is set, the response of the operation command 23-2 to the operation command 23-2 via the flip-flop 25-2, the on-delay timer 26-2, and the changeover switch 27-2. The signal 14-2 can be returned in a simulated manner. Here, the on-delay timer 26
In the case of a plant auxiliary machine (for example, a motor-operated valve in a power generation plant) that requires a certain period of time from receiving the operation command 23 to returning the response signal 14, -1, 26-2 are necessary as a simulated response signal generation circuit. This is not necessary in the case of a plant auxiliary machine (for example, a pump / fan or a solenoid valve in a power plant) which receives the operation command 23 and immediately returns the response signal 14. In other words, a simulated response signal close to the actual operation can be obtained by using two types of simulated circuits properly according to the type of the plant auxiliary equipment. Actually, when the plant auxiliary machine 309 is connected to the output device 12 and the input device 11 of the module 5, if the test simulation mode 24 is released, the changeover switches 27-1 and 27-
2 output only the signal on the 402 side to 403, even if the flip-flop 25-1 or 25-2 is set, the operation command 13 is sent to the plant auxiliary machine 309.
-1 or 13-2, the response signals 14-1a and 14-2a of the plant auxiliary machine 309 are established and the changeover switch 2
Response signal 1 via input 402 of 7-1 or 27-2
4-1 or 14-2 is established. After the test simulation mode 24 is set, the response signal 1 is set by the operation command 23-1.
When 4-1 is simulated, and when the operation command 23-2 for exhaustion is established, the flip-flop 25-
1 is reset when the input 406 is established, and the response signal 14-1 is not established when the input on the 401 side of the changeover switch 27-1 is not established. At the same time, the flip-flop 25-2 is set when the input 405 is established. As a result, the changeover switch 27-
2, the input signal on the 401 side is established, and the response signal 14-2 of the operation command 23-2 is simulated. After the test simulation mode 24 is set, the same applies when the response signal 14-2 is simulated by the operation command 23-2 and when the discharge operation command 23-1 is established. is there.

FIG. 7 shows a display method on a monitor of the maintenance / monitoring device in the test simulation mode. As shown in FIG. 7, the test simulation mode 24 (1 to
Whether n) is established or not is transmitted to the CPU 8 via the bus 4, and is collectively managed by the CPU 8. That is, the test simulation mode 24 (1 to 1) of each module 5 received by the CPU 8
The logical sum of n) is calculated, and the simulated signal 28 of the sequence control device 302 is created. CPU 8 to obtain visibility
Is displayed on the monitor 204 of the maintenance / monitoring device 6 connected to. Thus, when the test simulation mode 24 set for each plant accessory is forgotten to be canceled and actually connected to the plant accessory, the accessory drive signal 13
Can be eliminated.

[0013]

As described above, according to the present invention,
Conventionally required for simulation tests of sequence control devices by building a circuit on the sequence control device software that feeds back a response signal to all operation commands to plant auxiliary equipment output from the control program of the sequence control device. The simulated signal generator for test and the cable for connection thereof can be eliminated, the possibility of erroneous wiring can be eliminated, and the operation of the control program can be surely confirmed. In addition, by collectively managing the test simulation mode, it is possible to recognize the presence or absence of the plant auxiliary equipment being simulated, and to forget to cancel the test simulation mode set for each plant auxiliary equipment and to actually connect to the plant auxiliary equipment. Thus, the danger that the operation command is not output to the plant auxiliary equipment can be eliminated. Moreover,
By properly using two types of simulations according to the type of plant auxiliary equipment such as a pump / fan, a motor-operated valve, a solenoid valve, etc., it is possible to feed back a test simulation response signal that is closer to the actual operation.

[Brief description of the drawings]

FIG. 1 is a sequence control apparatus according to an embodiment of the present invention.

FIG. 2 is an overall configuration diagram of a power plant control device.

FIG. 3 is a block diagram illustrating functions of a module according to the present invention.

FIG. 4 is a flowchart of a control device test program according to the present invention.

FIG. 5 is a flowchart of a control device test program according to the present invention.

FIG. 6 shows hardware for facilitating the understanding of the control device test program of the present invention.

FIG. 7 is a view for explaining a display method in a test simulation mode according to the present invention.

[Explanation of symbols]

3: Control device 5: Module 6: Maintenance / monitoring device 7: Memory 8: CPU 9: Memory 10: MPU 11: Input device 12: Output device (auxiliary device driving function) 15: Normal driving condition processing function 16: Protection driving Condition processing function 17: Control device test program 24: Test simulation mode 201: CPU 202: Memory 204: Monitor 301: Transmission network 302: Sequence control device 303: Automatic control device 304: Common input / output panel 305: Central operation room 306: Operation device 307: Unit computer 308: Power generation plant 309: Plant auxiliary 310: Cable 311: Instrument panel

Claims (4)

[Claims] A control device for automatically storing and calculating control contents for automatically performing a sequential operation of a plant to be controlled; and a control device for storing and calculating protection and drive contents of one or more plant auxiliary machines. A sequence control apparatus having one or two or more processing units for instructing the plant on the result of the operation of the protection and drive contents and inputting the state information of the plant, wherein the control unit test program is incorporated in the processing unit; In the state where the plant auxiliary equipment is not connected, the control content, a test simulation mode for confirming the validity of the protection and drive content is set for each plant auxiliary equipment, and an operation command output to the plant auxiliary equipment is set. A sequence controller for feeding back a test simulation response signal to the sequence controller. 2. The test simulation mode according to claim 1, wherein the test simulation mode set for each plant auxiliary machine is transmitted to a control device, and the test simulation mode is collectively managed, and the presence or absence of the plant auxiliary machine being simulated is displayed. A sequence control device characterized by the above-mentioned. 3. The control device test program according to claim 1, wherein the control device test program stores an operation command to a plant auxiliary machine when the test simulation mode is being set when the operation command is received. In the case of a plant auxiliary machine that requires a certain period of time from receiving an operation command during normal operation to feeding back a response signal, after a few seconds to several minutes, feed back as a test simulation response signal of the operation command, In the case of a plant auxiliary machine which immediately feeds back a response signal in response to an operation command at the time of normal operation, a sequence control device which instantaneously feeds back as a test simulation response signal of the operation command. 4. A sequence control device according to claim 3, wherein when an operation command is received, a current operation command is stored, and when an exhaust operation command is stored, the sequence control device is deleted. .