JPS60120409A - Graphic control board - Google Patents

Abstract

PURPOSE:To grasp and cope with an abnormal state quickly by flickering a lamp indicating a pump or the like on a graphic board when abnormality occurs. CONSTITUTION:A lamp display circuit of a graphic board 10 is connected to a sequencer board 9 of automatic control; and when a contact 27 is turned on through a contact 14 and a relay 20 by an operation start command to open a valve 21, a limit switch 22 is turned on the sequence board 9, and an operation confirming relay 15 is turned on to detect the operation of said valve 21. When the limit switch is turned on, a lamp 24 on the graphic board 10 is lit to confirm the operation similarly. If the valve 21 is not operated by said command, a contact 13 is turned on, and a lamp 12 is lit to raise an alarm from a means 11. In this case, a contact 25 is added, and said lamp is flickered until the limit switch 22 is turned on during the time when said contact 14 is turned on.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a lamp display circuit for a control panel used for sequential control, particularly a graphic panel.

(Background of the Invention) In a conventional sequential control panel, an operator operates a master switch or the like on the operation panel that is directly controlled by an operator to issue a control start command signal, and this signal is used to automatically control the sequencer. It is imported into the sequencer of the panel, the sequential logic determined by the sequencer is progressed, and finally the pump related to control is sent from the sequencer panel.
Operate valves, etc. In addition, the on/off signals of limit switches for pumps, valves, etc. are imported into the sequencer board and used for sequential control, and are also imported into the graphic board. The switch is off. If it is open, it is on (2), and depending on the fidget, a green lamp will be lit if it is closed, and a red lamp if it is open, so that the operation of pumps, valves, etc. can be visually confirmed. By visual confirmation in this way, the operator can press the next master switch and proceed to the next process. In the event of an abnormality, an alarm is issued, but it is common to prevent the process from proceeding to the next process even if the master switch is pressed at that time. Abnormalities in sequential control can be broadly divided into three types. It is an abnormality that can be determined based on whether or not conditions such as startup conditions and operating conditions are met.For example, before moving on to the next process, the startup or stoppage, open or closed state of pumps, valves, etc. is monitored, and it is possible to move on to the next process. Used to determine whether The other is an abnormality due to startup congestion, which occurs when pumps, valves, etc. do not operate even after a certain period of time has passed after the operation command signal was issued. In addition to the above two abnormalities, there are also abnormalities due to abnormal liquid level in the tank, abnormal pressure in the pump, etc. Of the above three, the two mentioned above
The two abnormalities together are considered process abnormalities.

The problem lies in the way abnormalities are reported. Normally, in case of abnormal liquid level in the tank, abnormal pressure in the pump, etc., an alarm display lamp called an alarm window is installed in an easy-to-see place above the graphic panel, and in the event of an abnormality, the lamp lights up to indicate what is abnormal. I'll make sure you know what it is. However, the above two abnormalities,
One is due to conditions not being met, and the other is due to startup congestion, but these abnormalities only serve as warning windows for process abnormalities, and cannot indicate which pump or valve is abnormal. This was a drawback of the conventional board. Therefore, in controlled objects such as nuclear power plants that require emergency response in the event of an abnormality, the drawbacks of conventional panels can actually be said to have the potential for large losses.

[Purpose of the invention]

The present invention aims to prevent the drawbacks of the above-mentioned abnormality warning system, and basically aims to enable an operator to know which pump, valve, etc. is abnormal by looking at the panel when a process abnormality occurs. This is an attempt to provide a graphic record.

[Summary of the invention]

(4).

Specifically, operation command signals are issued for all operations such as pump valves, etc., except for manual settings, and by focusing on this and the on/off operation of limit switches that indicate the operating status of pumps, valves, etc., the command signals are When it is out, the display lamp on the graphic panel of the related pump, valve, etc. will flicker, and the limit switch signal will be ORed with that to the display lamp, so that the limit switch will actually operate after the command signal. However, since the signal from this limit switch is a continuous signal, the flickering of the display lamp can be stopped by the OR circuit, and a continuous lamp lighting display can be obtained.

Conversely, if the limit switch does not operate due to an abnormality in the pump, valve, etc., the flickering will continue until the abnormality occurs. With the above, when a process abnormality occurs, it is possible to visually check which pump, valve, etc. is abnormal.

[Embodiments of the invention]

Figure 1 shows the display method of a conventional graphic board. 1st
Figure 1 shows a graphical overview of the control system. This system is made up of four types of components 2 to 5: 2 is piping, 3 is valve, 4 is tank (5), and 5 is pump. 6 is a changeover switch for manual setting.

Figure 2 shows how the bulb is inserted into the graphic. 7 is a green lamp, and 8 is a red lamp. When the bulb is open, the red lamp 8 is lit, and when it is closed, the green lamp 7 is lit, so that the status of the bulb can be monitored by color.

FIG. 3 shows a conventional inter-panel connection in which a sequencer panel 9 for automatic control and a graphic panel 10 are connected. When an operator issues a control start command, for example, valve 2
1 will be explained using this figure. When a command signal is issued, contact 14 turns on and contact expansion relay 2
0 is turned on, the contact 27 of 20 is turned on, and the valve 21 is opened. Conversely, when there is no command signal, the valve 21 is closed. now,
When the valve 21 is opened, the limit switch 22 of the valve is turned on on the sequencer panel, and the operation confirmation relay 15 of the limit switch 22 is turned on, so that it is known that the valve 21 has operated. Here, 16.17° (6) and 18.19 respectively indicate the power supply. limit switch 2
2 is turned on, at the same time, the lamp 24 of the graphic board turns on.
lights up, and the operator can check the operation of the valve 21 by lighting this lamp. 23 is a voltage dividing resistor for providing a lamp voltage.

When the valve 21 does not operate for a certain period of time despite the command signal being output, or when it returns to its previous state after operating, contrary to the command signal, it is determined in the sequencer board that it is abnormal. The contact point 13 is turned on, the lamp 12 in the alarm window is displayed, and the alarm horn 11 emits an alarm sound.

Figure 1 shows the circuit according to the present invention. The difference from FIG. 3 is that a contact point 25 is added.

Contact 25 operates in the same way as contact 14 when a command signal is issued, but the difference is that it flickers and turns on and off repeatedly while contact 14 is on, that is, as long as the command signal is issued. be. As a result, the lamp 24 flickers until the command signal is issued and the limit switch is turned on, and when the limit switch is turned on, the lamp 24 stops flickering (7). Further, when the valve 21 becomes abnormal and the limit switch is not turned on, the flicker continues even after the abnormality alarm is issued.

FIG. 5 shows the logic inside the sequencer board that controls the flicker contact 25. In FIG. 5, signal A corresponds to the command signal for valve 21 in FIG. 4, and signal B corresponds to the ON signal of limit switch 22. C is a stop signal, which is turned on when the operator presses the stop master switch. 33.3
4 is an OR circuit, 32 is a NOT circuit, and 31 is an A N D
Shows the circuit.

Now, in the initial state where the command signal A is on and the limit switch signal and stop signal C are off, 31 A N IJ
The circuit is established and the signal is established. When the signal 1 is established, the next flicker circuit starts flickering, and its output signal E flickers, and this signal E turns the contact 25 in FIG. 4 on and off. Furthermore, when limit switch signal B is turned on,
31 A N l) The circuit is turned off and the output signal B of the reflicker circuit, in which the signal is not established, stops flickering. If an abnormality occurs due to the limit switch signal B turning off (8) even though the command signal is being output, generally the command signal A
The valve becomes finil-safe by eliminating it, but the AN of 31
Since the D circuit returns its output signal to the 34 OR circuits, the AND continues to be established and the output signal does not disappear. Therefore, the flicker can be generated even when the command signal is lost in the event of an abnormality. In this case, the flicker is stopped when the operator's stop command signal C is turned on.

〔Effect of the invention〕

As described above, by implementing the circuit explained in FIGS. 4 and 5, it is possible to not only issue a process abnormality alarm due to an abnormality in a pump, valve, etc., but also to determine which pump, valve, etc. is abnormal. It becomes possible to grasp abnormal conditions at an early stage and quickly respond to abnormalities, thereby reducing losses due to abnormalities.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram of the graphic board, Figure 2 is a state diagram of lamp insertion of bulbs used in graphics, Figures 3 and 4 are diagrams of the connection between the sequencer board, graphic board, and bulbs, and Figure 5 is FIG. 9 is a diagram showing the control logic of the flicker circuit used in the present invention (9). ■...Graphic, 2...Piping, 3...Valve,
4... Tank, 5... Pump, 6... Selector switch, 7... Green lamp, 8... Red lamp, 9... Sequencer board, 10... Graphic board, 11... Warning Sound device, 12... Alarm window display lamp, 13.14...
Contact, 15/Operation confirmation relay, 16.17, 18.19
...Power supply, 20...Contact amplification relay, 21...Valve, 22...Limit switch, 23...Resistance for voltage division, 24...Lamp, 25...Flicker contact, 26...
・Voltage dividing resistor, 27... Contact, 31... AND circuit, 32... NOT circuit, 33', 34... OR circuit, A... Command signal, B... Limit switch ON Signal, C... Stop signal, D... Output signal of 31 AND circuit, E... Flicker times (10)

Claims (1)

[Claims] 1. A graphic panel, which is a type of control panel used for the operation of the JL Kofang Power Plant, in which the operation of sequentially controlled objects such as pumps and valves can be confirmed by graphics and lamps in the graphics. You can check whether the pumps, valves, etc. inside are operating by using a light-emitting device such as a red, green, etc.-colored lamp, and you can also check for abnormalities in the pumps, valves, etc. shown in the graphic above. This system is characterized by the ability to issue an alarm for abnormal operation and at the same time flicker the lamp representing the abnormal pump, valve, etc. on the graphic, making it easy to confirm which pump or valve has become abnormal. Graphic control panel. 2. In claim 1, when an operation command for a pump, valve, etc. is issued regardless of the occurrence of an abnormality, a light emitting body such as a lamp indicating the pump, valve, etc. in the above graphic is activated. A graphic control panel characterized by flickering until the operation is completed (1).