JP2002189516A - Process control electronic computer system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a process control electronic computer system capable of monitoring maintenance information on time in a maintenance console, and performing the start and stop operations of the electronic computer by switches equipped in the maintenance console. SOLUTION: An electronic computer 1 for controlling a process by a preliminarily stored program is connected through one cable 3 so that the start, maintenance, and stop operation of the electronic computer 1 can be performed directly by a console 2. The cable 3 is connected by connectors 4 and 5 so as to be freely attachable and detachable. A relay circuit is housed in the console 2, and the operating state of the relay is made displayable so that the normal state and abnormality generating place of the electronic computer 1 can be displayed on time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a process control computer system.

[0002]

2. Description of the Related Art Conventionally, a computer system for process control, such as a nuclear power plant, a hydroelectric power plant, a thermal power plant, and a manufacturing apparatus, is constituted by a client (terminal) / server (computer) type computer. In order to prevent the user from operating the computer without permission, such a computer is calibrated once with an external relay unit without connecting a keyboard, and operations such as starting and stopping are performed by the maintenance console. I am trying to do it.

In order to start a process control computer, it is necessary to start the computer after confirming that a minimum pre-operation such as an operation system (OS) or application software (AS) has started. The circuit is configured to judge (calibrate) these confirmations based on the operation state of the relay. That is, the interface between the process control computer and the console is connected to the console via a dedicated relay terminal block having the above-mentioned relay unit.

[0004] For this reason, it is necessary to secure an installation space for the relay terminal block on the mounting board of the computer, and it is necessary to think and error to mount it in the limited installation space. Such a configuration in which a relay terminal block containing a large relay unit is externally attached makes processes such as adjustment and testing for shipping from a factory complicated and complicated.

Further, an interlock circuit is required for starting and stopping the computer so as not to operate unnecessarily. This interlock circuit is configured by a relay unit on the external relay terminal block. Therefore, a space for mounting cables required for connecting the relay unit to the computer and the console is required. Furthermore, the above-mentioned electronic computer systems all need to display the operation state via the above-mentioned relay unit and via the contact input / output device (PIO), so that a variety of devices are required.

[0006]

As described above, the relay unit is housed in a relay terminal block separate from the console, and the relay terminal block forms a layout as an accessory of the computer. Therefore, the console could not monitor the status of the computer. For example, when such a process control computer system is started, for example, the computer is not started up, or the computer is stopped, but a failure such as being unable to stop occurs, it is not known where the abnormality is. It is required that a computer system controlling such a process be started up immediately. When a normal failure occurs, it takes a long time for the process control computer to find the location and the cause of the failure.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide a process control computer system capable of monitoring the state of a computer on a console. Another object of the present invention is to provide a process control computer system in which a relay unit is provided in a console and the operation status of each relay unit is displayed so that maintenance information can be known to the maintenance console on-time. .

[0008]

To achieve the above object, a process control computer system according to the present invention comprises a computer section for controlling a process by a program stored in advance, and a computer section connected to the computer section. A console provided with a switch for controlling opening / closing of start, maintenance, and stop of the computer unit, and a display unit provided on the console and displaying an abnormal state of the computer unit. .

A process control electronic computer system according to the present invention comprises an electronic computer unit for controlling a process by a program stored in advance, and a switch connected to the electronic computer unit for controlling opening / closing of start, maintenance, and stop of the electronic computer unit. Provided, a console connected to the start, maintenance, stop circuit of the console, and a normal state of the computer unit connected to each relay circuit,
A display element for displaying an abnormal state, and the console can perform self-diagnosis.

The power supply of the console is connected to a connector separately from the console.

The display unit has an LED light emitting element, and displays an abnormal state by causing the LED light emitting element to emit light in accordance with a state of a relay corresponding to activation, maintenance, and stop of the console.

The contents of the display are a normal display and an abnormal display, respectively, such as start-up, maintenance, stop, power supply, temperature, CPU, etc., respectively.

The console is configured to be directly connectable with a connector, and the configuration of the interlock conditions necessary for starting and stopping the computer is configured in a maintenance console by using a micro relay to reduce the size. . As a result, if the associated devices are not available, the computer will start up,
If the stop operation could not be performed, the computer can be easily started and stopped with a maintenance console, and a stand-alone configuration can be realized.

Further, the status of the electronic computer can be monitored by an LED on the front of the maintenance console, so that the state of the electronic computer can be immediately determined. Also, in the event that the micro relay of the internal configuration should fail, the operation status of the relay is attached to the side of the maintenance console housing and can be checked on the relay operation status display section. In the event that an abnormality such as the status does not change occurs, it is possible to check whether there is a problem on the maintenance console side.

The maintenance console is configured to supply power from the outside, so that maintenance such as power supply replacement can be easily performed. Also, as a monitoring means in the event that external power is lost, a power loss signal can be output and displayed via an internal relay. The external power supply corresponds to DC 24 V and DC 48 V, and can be switched by an internal SW.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of a process control computer system according to the present invention will be described with reference to FIG.
FIG. 1 is a circuit configuration diagram for explaining the configuration of the process control computer system. The process control computer 1 reads out a program stored in advance and executes a process by a central control unit (CPU). The process control computer 1 and the console 2 are directly connected by one cable 3 without connecting a circuit in the middle. The cable 3 is a multi-core cable and is detachably connected to the computer 1 at both ends by connectors 4 and 5.
The console also has a function as a maintenance console, and is referred to as a maintenance console 2 in this embodiment.

The maintenance console 2 includes a start switch circuit for starting the computer 1, a stop switch circuit for stopping the started computer 1, and the computer 1.
A maintenance switch circuit that is selected when monitoring the state of the device is provided. A relay circuit that controls the operation of these circuits is provided. Further, a circuit for monitoring the state of the computer is provided. This circuit has a function of displaying a normal part of the computer 1 and a function of displaying an abnormal part of the computer 1.

The display of the normal part is, for example, normal operation of the computer, application software starts up, software online normal, operation system starts up, hardware online normal, power supply normal. The display of the abnormal part includes, for example, CPU operation abnormality, temperature abnormality,
The power supply is abnormal. By providing such a function to the maintenance console 2, the maintenance console 2 can monitor the start and stop of the computer 1 and the contents of maintenance. In particular, if a failure occurs, the details of the failure,
The location of the failure can also be known from the maintenance console 2.

Next, an embodiment of the process control computer system of the present invention will be specifically described with reference to FIGS. FIG. 2 is a circuit configuration diagram for explaining the configuration of the process control computer system. The same circuits as those in FIG. 1 are denoted by the same reference numerals, and detailed description thereof will be omitted. The configuration of a single process control computer system will be described.
A process control computer (host computer) 1 and a maintenance console 2 for starting, stopping, and performing maintenance operations are directly connected by a single cable, for example, a connector cable 3. This one connector cable 3 is, for example,
It is composed of a multi-core wire, and connectors 4 and 5 are connected to both ends.

One of the connectors 4 and 5 is connected to a connector 6 attached to the housing of the process control computer 1, and the other is connected to a connector 7 attached to the housing of the maintenance console 2. . The housing of the maintenance console 2 is provided with a start switch 8, a stop switch 9, and a maintenance switch 10 for the computer 1.
13, 14, and 15 are provided. The terminal block 12 forms a connector connection with an external power supply 16. The power supply 16 has a capability of outputting a voltage of 48 V at the terminal of the computer 1 and a voltage of 24 V to the maintenance console 2 and its peripheral devices. The power supply 16 is connected to the maintenance console 2
It has a capacity such as power for driving a relay built in the IC and power for LED display.

Further, the other terminal block 1 of the maintenance console 2
4 is connected to an input / output device 18 via a signal cable 17 to form a process control computer system 19. The process control computer system 19 controls the start, stop, and maintenance of the computer 1 directly from the maintenance console 2. By incorporating a relay unit in the maintenance console 2, the operation state of each relay can be displayed. The relay enables the maintenance console 2 to be made compact, small, and lightweight by using a micro relay.

The operation state of this relay is that the computer is normal,
Soft online normal, hard online normal, CPU
It indicates whether there is an operation abnormality, temperature abnormality, power supply abnormality, power supply interruption, or the like. When the application software starts up, the software on-line sends a signal indicating a normal operating state to the maintenance console 2.
Output to The hard online outputs a signal indicating a normal operation state to the maintenance console 2 when the operation system starts up. In the input / output device 18, the computer 1
And a signal indicating whether the power supply or the like is normal or abnormal.

Next, referring to FIG. 3, a circuit configuration for starting, stopping, and maintaining in the maintenance console 2 will be specifically described. FIG. 3 is a circuit configuration diagram for specifically explaining a connection state with each housing centering on the maintenance console of FIG. The same circuits as those in FIG. 2 are denoted by the same reference numerals, and detailed description thereof will be omitted. The contents of the junction of the connector 6 of the computer 1 for process control include an output system 21 and an input system 22 in the self-diagnosis function (RAS) of the computer 1. The output system is a signal output by the computer 1, and is provided with, for example, terminals such as a soft online signal and a hard online signal.

The input system 22 is a signal to be input to the computer 1, and includes various terminals such as a stop signal of the computer 1, a maintenance mode signal, a time adjustment signal, an external INZ (initialize) signal, and the like. These wires are bundled together and connected to the connector 7 of the maintenance console 2. The terminal arrangement of the connector 7 is the same as the terminal arrangement of the connector 6.

The circuit of the start / stop unit in the maintenance console 2 will be described. The terminal of the soft online signal and the terminal of the hard online signal output from the computer 1 are connected to the input terminal of the first AND gate 25, respectively, and the output terminal is connected to the output terminal 26 of the maintenance console 2. That is, when a soft online signal output when the application software starts up and a hard online signal output when the operation system starts up are output from the computer 1, they are input to the input terminal of the maintenance console 2.

From the circuit of the start switch 8 and the hard online terminal via the NOT circuit 27, the second AND gate 2
The output terminal is connected to an external INZ (initialize) terminal of the connector 7. That is, when there is no output of a hard online signal from the computer 1 and the start switch 9 is input, the start input signal is sent from the maintenance console 2 to the computer 1. That is, when the computer 1 is stopped, the start switch 8
Is configured to be input. The electronic computer 1
It outputs a hard online signal indicating that an OS (operating system) has been started, and subsequently outputs a soft online signal indicating that application software has been started. The state in which the computer 1 is activated as described above is a state where the computer 1 is operating normally when both the hard online signal and the soft online signal are turned on.

The AND gate 25 is turned on when a soft online signal and a hard online signal are input. This output signal is supplied to the input terminal of the third AND gate 31 of the input / output device 18, and if this gate 31 outputs "1", a signal indicating that the computer is normal is output.
When the gate 31 outputs "0", the computer 1 outputs a failure signal. The fourth AND gate 32 of the input / output device 18 is a circuit for confirming the normality of the auxiliary computer (slave) in the case of a dual computer system. The normality of the slave computer 1 can be determined by inputting the maintenance console output of the slave to the NOT circuit 34.

In this embodiment, since the system is a single system, the signal from the master terminal and the third AN
When the normal signal from the output of the D gate 31 is input to the fourth AND gate 32, the fourth AND gate 32 becomes "1".
Is output, the computer that is currently controlling the process outputs that it is the computer. Second A
The ND gate 28 is in the OFF state when the hard online signal is in the OFF state, and is turned ON when the start switch 8 is input, and starts the computer 1 through the external initialization terminal. That is, the computer 1 is initialized.

The circuit of the stop switch 9 is connected to the stop terminal of the connector 7 so as to be inputted to the computer 1. That is, when the stop switch 9 of the electronic computer 1 is input, it is input to the electronic computer 1. Furthermore, the maintenance switch 10 is connected to the maintenance mode terminal of the connector 7, and is configured to input to the computer 1. That is, when the maintenance switch 10 of the computer 1 is input, this input is input to the computer 1 via the maintenance mode terminal. The maintenance console 2 has a power status display circuit 11 for displaying a power status, for example, a normal output.
5 are provided.

The maintenance console 2 and the input / output device 18 for monitoring the state of the computer 1 are connected as follows. The output terminal 26 is connected to the input terminal of the third AND gate 31 of the input / output device 18. I / O device 18
Is further provided with a fourth AND gate 32.
The input terminal of the AND gate 32 is connected to the output terminal of the third AND gate 31, and the other input terminal of the fourth AND gate 32 is connected to the master terminal of the maintenance console 2. A signal indicating that the computer 1 has started up is output to the master terminal. To set the time,
An external standard clock 33 is provided, time information is output from the clock 33, and input to the maintenance console 2 via the input / output device 18.

Further, a digital input / output module (D
(IOM) terminal block 41 is provided. This terminal block 41
Is composed of an output 42 from the computer 1 and an input 43 to the computer 1. The output terminal is the master, the terminal whose state is changing. Input terminal is normal for own system, master for own system,
Terminal rows are provided for other system normal, other system master, other system state changing, and the like. The own system represents the maintenance console 2 on the master side. The other system represents a maintenance console on the slave computer system side in a dual system in which the slave computer systems are connected.

Further, a connection terminal block 51 is connected between the maintenance console 2 and a digital input / output module (DIOM) terminal block 41. The operation of the electronic computer 1 follows by selecting the switch circuits 95 to 97 of the maintenance console 2 and requesting the start, stop, and maintenance of the electronic computer 1 and sending them to the electronic computer 1 via the cable 3. By inputting the status to an input / output device (PIO device) 18 via a signal cable 17, a configuration capable of monitoring the status is obtained.

Next, a display circuit system of each maintenance item of the maintenance console 2 will be specifically described with reference to FIG. FIG.
FIG. 4 is a circuit connection diagram for explaining a display circuit system for maintenance items of the maintenance console in FIG. 3. The same circuits as those in FIGS. 2 and 3 are denoted by the same reference numerals, and detailed description thereof will be omitted. With respect to the terminal row of the maintenance console 7, the input system 22 to the computer 1 and the output system 21 from the computer 1 in FIGS.
Is displayed. The input system is a terminal 61 for stop, maintenance mode, automatic time adjustment, latch relay reset, external initialization, remote power OFF input, remote power ON input, and the like. The stop is input to the computer 1 when the stop switch 9 is input.

The automatic time adjustment 107 always receives time information from the clock 33. In the latch relay reset, when an abnormality occurs, for example, a power supply abnormality occurs, even if an attempt is made to start after repairing, there is a case where it cannot be started. In such a case, the reset operation is performed.

The external initialization (initialization) is an operation for executing an initialization procedure by inputting a start signal to the computer 1. The remote power OFF input 108 is for turning off the power of the computer 1. The remote power ON input 109 is for turning on the power of the computer 1. An input / output terminal 62 of a relay is connected between terminals 61 of each information sent to the computer 1 so as not to operate unnecessarily.

Next, the output system will be described. This output system is soft online, hard online, CPU operation abnormal,
Terminals 70 to 81 for temperature abnormality, power supply abnormality, power supply cutoff, and the like, and these pieces of information are output from the computer 1. One end 70, 72, 74, 76, 78, 8 of each of these information
0 is a series connection circuit 84 of a resistor 82 and a display element such as an LED element 83, a relay 85 and a backflow prevention diode 8
6 parallel circuits 87 are connected in parallel. The free ends of the parallel connection circuits are connected in common 88 to form each display circuit. The connection end 88 is connected to a parallel connection circuit 87-1 of a relay and a backflow prevention diode.

One end of a series connection circuit 91 of relays 89 and 90 is connected to the free end of the parallel connection circuit 87-1. The other end of the series connection circuit 91 and the terminals 71 and 7
3, 75, 77, 79 and 81 are connected to a common connection 92
Have been. The common connection end 92 and the connection end 88 are LE
The parallel connection circuit of the series connection circuit 84-1 of the D element and the resistor and the parallel connection circuit 87-2 of the relay and the diode are connected to form the power supply state display circuit 106. Further, the series connection circuit 8 is connected to the common connection end 92 and the connection end 88.
The parallel connection circuit of 4-2 and the parallel connection circuit 87-3 is connected, and a series connection circuit of the relays 93 and 94 is connected to the free end of this circuit.

Further, switch circuits 95, 96, 97 for stop 9, maintenance 10, and start 8 are connected to the common connection terminal 92. The respective switch circuits 95, 96, 97 are connected as follows. A parallel connection circuit 87-4 of a diode and a relay is connected, and a switch 98 is connected to this circuit 87-4. This switch 98 and switch 9
Reference numeral 9 designates a double switch for simultaneously switching two circuits and switching them simultaneously. One end of the switch 99 is connected to the common connection end 92, and the other end is connected to the LED element 100, forming a stop switch circuit 95. This switch circuit 9
5, a maintenance switch circuit 96 and a start switch circuit 97 are connected.

The common connection end 92 is connected to a power supply 102 via a DC / DC converter 101 to be used as a power supply line. This power supply 102 is externally attached to the maintenance console 2. In other words, the maintenance console 2 is a large heat source, and is externally connected to a power supply to be maintained. 48V DC and DC2 from power supply 102
Supply 4V. Four switches 1 that simultaneously switch four circuits so as to be able to selectively switch between the two power supply circuits
03 and 104 are connected. At all times, 48V is selected and driven, and when the stop switch 95, maintenance switch 96, start switch 97, etc. are input, 24V is selected to turn on the LED elements 100a, 100b, and 100c.

Further, the terminal block 105 of the maintenance console 2
Is a latch relay reset 10 output to the computer 1
6, time setting 107, remote power OFF input 10
8. Each terminal such as a remote power ON input 109 is provided. The latch reset 106 is a reset signal when restarting after a failure (maintenance) such as the presence of a soft online abnormality, the presence of a hard online abnormality, a CPU operation abnormality, a temperature abnormality, a power supply abnormality, and a power supply interruption. Is a terminal for sending out. Each of these circuits has a parallel connection circuit 87-
7 to 10 are connected to form a circuit so as not to conduct unnecessarily. The terminal block 105 is connected to the input / output device 18, the connection terminal block 51, and the clock 33. The maintenance console 2 is configured as described above.

Next, the operation will be described. When the start switch 8 is input, the relay 85 of the parallel connection circuit 87-6 becomes conductive, and the LED element 100c is turned on to display the start. Then, the computer 1 is connected to the external initialization terminal.
, The computer 1 starts an initialization procedure for activation. That is, when the process control computer 1 is started, the switch 98 of the start switch circuit 97,
By inputting 99, the LED (lamp) element 100c
Lights up, and the user can recognize that the request has been accepted. An activation request has been made. In response to this request, the relay 85 connected to the activation switches 98 and 99 operates.

When the hard online signal is in an OFF state, that is, when the computer 1 is in a stopped state, the relay 85
The relay 85 of the series connection circuit 91 operates, and a start (external initialization) request is notified to the process control computer 1 via the connector cable 3. The start-up operation of the notified computer 1 for process control is started. That is, the operating system (OS) starts up, the hard online signal is turned on, and the relay 93 and the relay 90 of the series connection circuit 91 operate.

Next, in the process control computer 1, the application software is started and the soft online signal is turned on. As a result, the relays 85 and 94 connected to the soft online terminal, and the parallel connection circuits 87-9 to 87-1 connected to the remote power OFF input terminal and the remote power ON input terminal of the terminal block 105.
Each of the 0 relays 85 is turned on. That is, the data is output from the maintenance console 2 to the input / output device 18. The input / output device 18 can grasp the state of the computer 1.

When it is desired to stop the running computer 1, the stop switch 9 is input and the parallel connection circuit 87-
The relay of No. 4 is turned on, the LED element 100a is turned on, and a display indicating that the stop is instructed is displayed. Then, by inputting to the computer 1 from the stop terminal 61, the computer 1 starts a stop operation. That is, in the case of a stop request, by inputting the stop switches 98 and 99 of the stop switch circuit 95, the LED element 100a is turned on, and the relay 85 of the parallel connection circuit 87-4 connected to the stop switch 98 also operates. The computer 1 is notified of the stop request.

As a result, the stop operation is started by the application software (AS), the soft online signal is turned off, and the normal signal of the computer 1 is also turned off. When the soft online signal shifts to the OFF state, the operation system (OS) also enters a stop process, the hard online signal also turns OFF, and a series of stop operations is completed.

The operation of the relay 85 of the parallel connection circuit 87-4 is based on the LED element 100a for confirming the operation of the relay 85.
Thus, the operating state of the relay 85 can be grasped. That is, when the relay 85 operates, the LED element 100a is turned on. When the maintenance switch 10 is input, the relay of the parallel connection circuit 87-5 becomes conductive and the LED element 100
b is lit to indicate that it is in the maintenance state. Then, each LED element 83 is turned on to display the presence or absence of information such as a soft online abnormality, a hard online abnormality, a CPU operation abnormality, a temperature abnormality, a power supply abnormality, and a power supply cutoff output from the computer 1 to the terminals 70 to 81. .

These are failure location (maintenance) information. When an abnormality occurs in the electronic computer 1, the operation system notifies the computer 1. Further, the status of the power supply circuit externally attached to the maintenance console 2 is lit on the LED element connected to the series connection circuit 84-1 of the power supply status display circuit 115. Lights to indicate that power is being output normally. In this way, the maintenance console 2 displays the self-diagnosis contents such as the operating state of the computer 1, the presence or absence of an abnormality, and the cause of the abnormality. That is, as the status monitoring of the computer 1 for process control, an abnormality of the computer 1 can be monitored, including the status of the hard online, the soft online, and the status of the computer normal signal.

This monitoring is, for example, state monitoring such as an abnormal operation of the CPU, an abnormal temperature, an abnormal power supply, and a power cut. The display of the information desired by the user can be grasped in a list form by attaching a display element array, for example, a panel having an LED array, to the front (front) surface of the housing of the maintenance console 2. The abnormality monitoring output of the process control computer 1 is output as a signal by a self-diagnosis function mounted inside the computer, and is notified to the computer 1 via the connector cable 2. FIG. 5 is a flowchart showing an outline of the flow of the above series of operations.
become that way. 2 to 4 are denoted by the same reference numerals.

Embodiment-2 Next, an embodiment of a dual process control computer system will be described with reference to FIG. FIG. 6 is a circuit diagram for explaining an embodiment of the dual process control computer system 110. The same reference numerals are given to the same circuits as those in FIGS. The computer 110 is a system in which two single process control computer systems 19 are prepared, one process control computer computer 19 is used as a master, and the other process control computer system 19 is used as a slave (backup computer). is there.

Therefore, the master computer system 19 and the slave computer system 19 simultaneously execute the same contents. In order to realize this simultaneous operation, they are connected as shown in FIG. Terminal block 1 of maintenance console 2 on master side
3 is connected to the DIOM terminal block 6 of the maintenance console on the slave side. Furthermore, the maintenance console 2 on the slave side
Is connected to the DIOM terminal block 6 of the master-side maintenance console. Master and slave DIOM
Terminal blocks are directly connected. Thus, the process control computer system 110 in which the single system is replaced with the dual system is configured.

FIG. 7 shows a more specific configuration of the dual process control computer system 110.
FIG. 7 is a configuration diagram for explaining the configuration of the dual process control computer system 110 of FIG. Figures 1-4
The same circuits as those described above are denoted by the same reference numerals, and detailed description thereof will be omitted. It is connected so as to output from the connection terminal block 51 on the slave side to the connection terminal block 51 on the master side. Further, the input / output devices 17 on the master side and the slave side are mutually connected.

That is, from the master terminal of the maintenance console 2 on the slave side to the fourth AND of the input / output device 18 on the master side.
The input terminal of the gate 32 is connected via a NOT circuit 34. Similarly, the master terminal of the maintenance console 2 on the master side is connected via a NOT circuit 34 to the input terminal of the fourth AND gate 32 of the input / output device 17 on the slave side. The clock 33 is shared by one terminal and one computer 1 in the dual system.

Accordingly, an input is made to the computer 1 from the external clock 33 via the master and slave maintenance consoles 2. With such a circuit configuration, a dual process control computer system can be configured. Third and fourth AND gates 31 and 32 are connected between the computer 1 on the master side and the slave side in the input / output circuit 17 so that the operation states can be mutually confirmed. That is, when the computer 1 on the master side performs the process control, the AND gate 31 of the input / output device 17 on the master side outputs “1”.

Conversely, when the computer 1 on the slave side controls the process, the AND gate 31 of the input / output device 17 on the slave side outputs "1". When the computer 1 on the master side fails, the third AND gate 31 of the input / output device 17 on the master side outputs "0". Conversely, the third AND gate 31 of the input / output device 17 on the master side outputs “0”. When both the master side and the slave side fail, the fourth AND gate 32 of the input / output device 17 on the master side and the slave side outputs “0”. This is a so-called serious failure.

When inputting a stop switch,
When the stop switch 9 is input from the maintenance console 2 on the master side, all of them are stopped. Therefore, the stop switch 9 is input from the maintenance console 2 on the slave side first to stop the computer 1 on the slave side, and then the master side. Input the stop switch 9 from the maintenance console 2.

Although the above embodiment has been described with reference to the example of the maintenance console 2 for starting and stopping the control computer 1, the invention can be applied to any maintenance console applicable to a distributed computer system. it can.

[0057]

According to the present invention, since the relay unit is provided in the maintenance console and the operation state of each relay unit is displayed, the maintenance information can be monitored on the maintenance console on time. Further, the start and stop operations of the computer can be performed by operating switches provided on the maintenance console.

[Brief description of the drawings]

FIG. 1 is a circuit configuration diagram for explaining an embodiment of a process control computer system of the present invention.

FIG. 2 is a circuit configuration diagram specifically illustrating the configuration of FIG. 1;

FIG. 3 is a circuit configuration diagram for explaining operations of starting, stopping, and maintaining a process control computer system using the maintenance console of FIG. 2;

FIG. 4 is a circuit configuration diagram for explaining monitoring of an operation state of the process control computer system of FIG. 2;

FIG. 5 is a flowchart for explaining an operation state of the process control computer system of FIG. 2;

FIG. 6 is a circuit diagram illustrating another embodiment of FIG. 2;

FIG. 7 is a circuit configuration diagram for explaining a specific configuration of FIG. 5;

[Explanation of symbols]

1. Computer for process control, 2. Console, 3,
17 ... cable, 4, 5, 6, 7 ... connector, 8 ... start switch, 9, 98, 99 ... stop switch, 10 ... maintenance switch, 12, 13, 14, 15 ... terminal block, 16, 1
02 power supply, 18 input / output device, 19 process control computer system, 21 output system, 22 input system, 2
5, 31, 32 ... AND gate, 33 ... clock, 41 ... D
IOM terminal block, 42 output, 43 input, 51 connection terminal block, 62, 85, 93, 94 relay, 71-81
Terminal, 82: resistor, 83, 100a, b, c: LED element, 84, 91: series connection circuit, 86: backflow prevention diode, 87: parallel connection circuit, 88: connection portion, 92: common connection terminal, 95 ~ 97 ... Switch circuit, 98, 99, 1
03, 104: switch, 105: terminal block, 106: latch relay reset, 107: time adjustment, 108: reset current OFF input, 109: remote current ON input, 110: double process control computer system 115: power supply Status display circuit.

Claims (5)

[Claims] 1. An electronic computer unit for controlling a process by a program stored in advance, connected to the electronic computer unit, starting the electronic computer unit,
A process control computer system, comprising: a console provided with a switch for controlling opening and closing of maintenance and stop; and a display unit provided on the console for displaying an abnormal state of the computer unit. 2. An electronic computer unit for controlling a process by a program stored in advance, and starting of the electronic computer unit connected to the electronic computer unit.
A console provided with a switch for controlling opening and closing of maintenance and stop; a relay connected to each of the start, maintenance, and stop circuits of the console; and a normal state of the computer unit connected to each of the relay circuits , A display element for displaying an abnormal state, and a self-diagnosis process at the console. 3. The process control computer system according to claim 1, wherein a power source of the console is externally connected to the console separately from the console by a connector. 4. The display section has an LED light emitting element, and displays an abnormal state by causing the LED light emitting element to emit light in accordance with a state of a relay corresponding to start, maintenance, and stop of the console. The process control computer system according to claim 2. 5. The contents of the display include start, maintenance, stop,
5. The process control computer system according to claim 1, wherein a normal display and an abnormal display are individually provided for a power supply, a temperature, a CPU, and the like.