JP2002041104A - Plant monitor controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a plant monitor controller for allowing even an operator who is not familiar with plant equipment to easily continue control by a simple controller in a simple constitution when the abnormality of a control controller is generated. SOLUTION: An input and output device 3 is provided with the reception area of a simple controller 2 separately from a control controller 1, and output signals from the both controllers 1 and 2 are processed based on existence information from each controller, and when the abnormality of the control controller 1 is generated the simple controller 2 is connected.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plant monitoring and control device that performs a substitute operation with a simple controller when a control controller that monitors and controls a plurality of plant devices constituting a plant is abnormal.

[0002]

2. Description of the Related Art In recent years, a control controller of a plant monitoring and control apparatus has performed processing of plant equipment constituting a plant in detail. For this reason, the abnormality of the controller often becomes fatal in plant control.

[0003] Usually, the controller has a high-performance system in which the controller is duplicated in order to increase redundancy as a countermeasure against abnormalities, or a manual operation in which a monitoring console is provided separately from the controller is performed.

[0004]

As a conventional means for increasing the redundancy, there is a dual controller. However, as the control becomes more complicated, the duplicated signal processing, the common memory processing between a plurality of controllers, and the switching conditions are also required. There is a drawback that in a small-scale plant, the system construction cost is more expensive than the plant control itself due to the complexity and the high cost of the duplexer. In addition, the manual operation requires advanced know-how to manually operate plant equipment that has become complicated in recent years. Therefore, it is necessary to have a prerequisite that operators fully understand the entire target plant and plant equipment. . SUMMARY OF THE INVENTION An object of the present invention is to provide a plant monitoring and control apparatus which can easily continue control by a simple controller with a simple configuration even when a controller controller is abnormal, and even a worker who is not familiar with plant equipment with a simple controller.

[0005]

According to the present invention, a receiving area of a simple controller is provided in an input / output device in addition to a controller, and output signals from both controllers are processed based on survival information from each controller. It is characterized in that a simple controller is connected when the controller controller is abnormal.

According to the present invention, control can be continued with a simple controller in the event of an abnormality in the controller, and it is possible to easily cope with a small-scale plant without using expensive equipment such as a redundant controller and the like. Even workers who are not familiar with the system can easily take temporary recovery measures.

[0007]

FIG. 1 shows an embodiment of the present invention.
In FIG. 1, a controller 1 performs monitoring control on plant equipment based on state information of the plant equipment (not shown). The input / output device 3 outputs an output signal (operation signal) of the controller 1 to the plant equipment, and transmits state information from the plant equipment to the controller 1. The controller 1 and the input / output device 3 are connected by a communication line 4. The simple controller 2 has the same function as the control controller 1 or performs somewhat simple control of the control controller 1, and is provided on a field console or a portable personal computer. Survival information, which will be described later, is added to the transmission data from both the controller 1 and the simple controller 2.

The input / output device 3 includes a receiving circuit 32a for the controller 1 and the simplified controller 2, and a computer (CPU) 31 for processing output signals based on the survival information of each controller obtained by the receiving circuit 32a. I have. The controller 1 is a transmission circuit 32c of the input / output device 3.
Receiving circuit 12b (receiving C) for receiving an input signal from
Received input signal and control program 13 stored in advance
It comprises a CPU 11 for generating an output signal as an operation command for plant equipment, and a transmission circuit 12a (transmission A) for outputting the operation signal generated by the CPU 11 to the input / output device 3. Like the controller 1, the simple controller 2 includes a receiving circuit 22b (receiving C) for receiving an input signal,
Received input signal and control program 23 stored in advance
It comprises a CPU 21 for generating an output signal as an operation command for plant equipment, and a transmission circuit 22a (transmission B) for outputting a signal generated by the CPU 21 to the input / output device 3. Although the simple controller 2 has substantially the same configuration as the control controller 1 in FIG. 1, the configuration is actually simpler.

The input / output device 3 includes a receiving circuit 32a (receiving A) for receiving an output signal from the control controller 1, a receiving circuit 32b (receiving B) for receiving an output signal from the simple controller 2, and receiving circuits 32a and 32b. That processes an output signal based on the survival information of each of the controllers 1 and 2 received
U31, an output circuit 34 for performing operation output of the output signal processed by the CPU 31 to the plant equipment, an input circuit 33 for acquiring the state of the plant equipment, and transmission for transmitting the input circuit 33 to the controller 1 and the simple controller 2. It is composed of a circuit 32c. The controller 1, the simple controller 2, and the input / output device 3 are connected by a bus-type communication line 4, and input / output signals transmitted from the transmission circuits 12a, 22a, 32c are received by the respective reception circuits 12b, 22b, 32.
By adopting a communication mode using broadcast communication received at a and 32b, each device can detect a communication abnormality. The operation of this configuration will be described with reference to FIG.

In this configuration, usually a simple controller
If controller 2 is normal and controller 2 is not connected,
The state information of the plant equipment obtained by the input circuit 33 of the input / output device 3 is transmitted from the transmission circuit 3. Since the input signal is not received by the receiving circuit 22b of the simple controller 2 that is not connected and cannot be transmitted from the transmitting circuit 22a of the simple controller 2, nothing is input to the receiving circuit 32b for the simple controller 2 in the input / output device 3. No data is written. On the other hand, since the input signal is received by the receiving circuit 12b of the control controller 1, the CPU 11 outputs a predetermined output signal from the transmitting circuit 12a according to the input signal and the control program 13. Data is written to the receiving circuit 32a for the controller 1. As a result, the CPU 31 of the input / output device 3 outputs the output signal 32aa of the controller 1 from the output circuit 34 of the input / output device 3. In the case of the simple controller 2 connection state when the controller 1 is abnormal, the plant equipment information obtained by the input circuit 33 of the input / output device 3
The input signal is received by the receiving circuit 12b of the controller 1 and the receiving circuit 22b of the simple controller 2. However, since the controller 1 cannot output the survival signal, which is a normal signal, due to some kind of failure, erroneous data is received by the receiving circuit 32a for the controller 1 of the input / output device 3.

The simple controller 2 outputs a predetermined output signal from the transmission circuit 22a of the simple controller 2 according to the input signal and the control program 23, so that the reception circuit 32b for the simple controller 2 of the input / output device 3 operates normally. Data will be written. Therefore, the CPU 31 of the input / output device 3 determines that the survival information 32ab of the controller 1 has an abnormality, and outputs the output signal 32ba of the simple controller 2 from the output circuit 34 of the input / output device 3. When both the controller 1 and the simple controller 2 are normally connected, the plant equipment information obtained by the input circuit 33 of the input / output device 3 is transmitted by the transmission circuit 32c of the input / output device 3. The plant equipment information from the transmission circuit 32c is transmitted to the reception circuit 12
b and the receiving circuit 22b of the simple controller 2.
In each of the controllers 1 and 2, an output signal determined in advance by an input signal and a control program is output to each of the controllers 1 and 2.
2 are output from the transmission circuits 12a and 22a. Therefore, normal data is written to the receiving circuits 32a and 32b corresponding to the controllers 1 and 2 of the input / output device 3. As a result, the CPU 31 of the input / output device 3 determines that the survival information from each of the controllers 1 and 2 is normal, and outputs the result of processing the output signal of each controller by the OR circuit 35 to the output circuit 34. At this time, there is no erroneous output as long as the control program 13 of the controller 1 and the control program 23 of the simple controller 2 are the same program, but assuming a case, the CPU 3 of the input / output device 3
At step 1, when the controller 1 is normal, it is determined that the output signal 32ba of the simple controller 2 is ignored.
FIG. 2 is a processing diagram of the input / output device 3 and the transmission / reception data. Transmission data from control controller 1 and simple controller 2
5 is the transmission data start signal 5a and the transmission data station number 5 of the controller 1 or the simple controller 2 as the transmission source.
b, a transmission data output signal 5c, transmission data survival information 5d indicating a normal state of each of the controllers 1 and 2, a transmission data end signal 5e, and a transmission data cyclic code 5f indicating the reliability of the transmission signal.

The reception data 5 is stored in a reception circuit corresponding to the transmission data station number 5b. From the stored data, the CPU 31 of the input / output device 3 extracts survival information from the reception data obtained by the reception circuit, and if there is an abnormality in the survival information, the received data is initialized (data is cleared). If the survival information is normal, it is extracted as it is as an output signal, and each controller 1, 2
And outputs the result of the OR circuit 35 of the input / output device 3 to the output circuit 34. The plant information outputs data obtained from the input circuit 33 of the input / output device 3 to the transmission circuit 32c, and the transmission circuit 32c transmits the transmission data start signal 6a, the transmission data station number 6b of the input / output device 3 which is the transmission source, and the transmission data. The input signal 6c, the transmission data end signal 6d, and the transmission data 6 composed of the transmission data cyclic code 6e indicating the reliability of the transmission signal are processed and output. By additionally connecting the simple controller when the control controller is abnormal in this way, the simple controller can output transmission data based on the plant information from the input / output device. The control can be continued by outputting an output signal to the output circuit based on the transmission data of. As a plant monitoring and control device, a complicated system such as a duplex system, which is a conventional high-performance system, is assembled in order to continue control by connecting a simple controller for dealing with abnormalities in addition to a normal controller each time. Eliminates the need. Also, if the present invention is applied to system upgrades such as extension / remodeling, the controller for the extension / remodeling confirmation test and the backup controller before the extension / remodeling can be easily switched, and the program at the time of extension / remodeling can be changed. There is an effect that instantaneous switching at the time of abnormality can be performed.

[0013]

According to the present invention, the control can be continued by the simple controller when the controller controller is abnormal, and it can easily cope with a small-scale plant without using expensive equipment such as a duplicated controller controller. Even workers who are not familiar with plant equipment can easily take temporary recovery measures.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing one embodiment of the present invention.

FIG. 2 is a processing diagram of the input / output device in FIG. 1;

[Description of Signs] 1 ... Controller, 11 ... Controller CP
U, 12a: Control controller receiving circuit, 12b: Control controller transmitting circuit, 13: Control controller control program, 2: Simple controller, 21: Simple controller CPU, 22a: Simple controller Receiving circuit, 22b: simple controller transmitting circuit, 23: simple controller control program, 3: input / output device, 31: input / output device CPU, 3
2a ・ ・ ・ I / O device receiving circuit A, 32aa ・ ・ ・ Control controller output signal, 32ab ・ ・ ・ Control controller normal signal, 32b ・ ・ ・
Input / output device receiving circuit B, 32ba: simple controller output signal, 32bb: simple controller normal signal, 32c: input / output device transmission circuit, 33: input / output device output circuit, 34: input Output device input circuit, 35: I / O device OR circuit, 4: Communication line, 5: Received data, 5a: Received data start signal, 5
b ... received data station number, 5c ... received data output signal, 5d ...
Received data survival signal, 5e ... Received data end signal, 5f ...
Received data cyclic code, 6 ... Transmission data, 6a ... Transmission data start signal, 6b ... Transmission data station number, 6c ... Transmission data output signal, 6d ... Transmission data survival signal, 6e ...・ Transmission data end signal, 6f ・ ・ ・ Transmission data cyclic code

Claims (2)

[Claims] 1. A control controller for monitoring and controlling a plurality of plant equipment constituting a plant, outputting an operation signal from the control controller to the plant equipment, and providing a state signal of the plant equipment to the control controller. An input / output device and a simple controller for controlling the plant equipment when the control controller is abnormal, wherein the input / output device has a reception area for each of the controllers for receiving output signals from the control controller and the simple controller. And an alternative operation of the two controllers is performed in accordance with the survival information included in the transmission data of the two controllers. 2. A control controller for monitoring and controlling a plurality of plant equipment constituting a plant, outputting an operation signal from the control controller to the plant equipment and providing a state signal of the plant equipment to the control controller. An input / output device, and a simple controller installed at a site for controlling the plant equipment when the control controller is abnormal, wherein the input / output device receives both the control controller and an output signal from the simple controller. A plant monitoring and control device, having a reception area for each controller, wherein an alternative operation of both controllers is performed in response to a state change signal included in transmission data of both controllers.