JPH0813157B2 - Remote device operation confirmation device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Industrial field of application) The present invention is a remote control suitable for confirming normality and abnormality of a field device located remotely from a central control room in a plant operation system. The present invention relates to a device operation confirmation device.

(Prior Art) In a plant operation system such as a power plant, for example, in the case of continuously operating on-site equipment constituting various system of a plant that uses a motor such as a pump as a drive source, installation is performed prior to the continuous operation. In order to confirm that there is no problem with the condition or direction of rotation, in-situ operation of the field equipment is performed from the main control room. This inching operation starts the operation switch, and immediately confirms that the start command has been transmitted to the site by answerback, immediately stops the operation switch, or operates the field device instantaneously by the opposite operation. Alternatively, the operation is to stop. By performing this inching operation from the main control room, the confirmer placed on site confirms that the equipment is normal.

In this way, in the plant operation system, in order to avoid continuous operation of the field equipment under abnormal conditions, be sure to perform the above inching operation at the stage of plant construction and at startup after periodic inspection. There is. Further, the operation time of the inching operation is set to be extremely short so that the device does not actually start or stop.

(Problems to be solved by the invention) However, recent plant operation systems have become large-scale, highly accurate, and highly functional, and the number of information lines exchanged between the central control room and each site is very large. It has become to. It would be a huge number if all these information lines were to be realized by a single signal line. Therefore, in recent plant operation systems, the central control room and each site are connected in a loop with optical cables to perform multiplex transmission of information, but in the central control room, information for each site is created in order. On the other hand, while sending out, each site waits for the information to be fetched in order, and necessary information is returned to the main control room after waiting for the turn, which causes a delay in information transmission. Therefore, even if a command to start the field device is issued from the central control room for the inching operation to confirm the operation of the field device, the fact that the start command is input to the field device is answered by the field entry / exit device by answerback. It takes time to confirm. Furthermore, even if a stop command is issued immediately after confirming the operation of the equipment, it takes time for the stop command to reach the field equipment and stop the equipment. It starts to move. On the other hand, in order to avoid this, there was a problem that the temporary test switch had to be transported to the site.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to solve the above-mentioned problems and provide a remote device operation confirmation apparatus that enables a reliable inching operation without being affected by a delay in information transmission.

[Structure of the Invention] (Means for Solving Problems) The present invention relates to a field device whose state is to be confirmed by an inching operation, and a stop operation or a stop operation following a start operation without an answerback input. Accept the startup operation following
A start command is followed by a stop command or a stop command followed by a start command is output from the field input / output device to the field device.

(Operation) From the central control room, the operator performs the start operation and then the stop operation or the start operation following the stop operation for the field equipment that the operator wants to confirm the operation, so that the field equipment can be reliably dimensioned even if there is a delay in information transmission. You will be able to operate it.

(Embodiment) FIG. 1 shows a block diagram of a remote device operation confirmation apparatus according to an embodiment of the present invention, which is an example in the case of inching operation of a pump from a central control room through a multiplex transmission cable. .
In the figure, the CRT 1 has a touch screen, and when the operator touches the screen, the position is output as coordinate data. This CRT1 with touch screen has
A system diagram showing the configuration of the plant is displayed, and the operator selects the symbol of the device to be operated by touch operation. The touched coordinate data is output from the CRT 1 to the monitor control device 2. The monitor control device 2 selects an operator based on the currently displayed screen data and touch coordinate data, determines the device, and displays an operation switch display (hereinafter referred to as a touch switch) corresponding to the device on the CRT 1. Do it. If the selected device is a pump, this touch switch will display "ON", "OFF", "automatic", etc. with the same selection position as the switch by the conventional hardware. The operation is selected by touching the display. The operator touches the display of the operation he / she wants to perform (for example, “ON” when he / she wants to start the pump) with this touch switch.

The monitoring control device 2 creates operation data for operating the device at the timing when the touch switch is selected, and sets the operation data in the own station 3 in the multiplex transmission system. The data set in the station 3 is transmitted to the on-site station 5 via the multiplex transmission cable 4. However, a plurality of stations are also connected to the multiplex transmission system, and one station transmits the data. In the case of transmission, since the processing is performed in order as described above, there is always a waiting time. This point is the difference between the operation switch and the one-to-one connection configuration of the device in the conventional system. Therefore, after this waiting time, the operation data set in the station 3 is returned to the field station 5 via the multiplex transmission cable 4. The operation data sent to the on-site station 5 is processed by the on-site input / output device 6 and outputs the specified signal (contact output, analog output, etc.) to the device specified by the operation data.

For example, if the operation data is a pump start request, the second
As shown in the figure, the field input / output device 6 outputs the circuit breaker “ON” contact output a to the power circuit breaker (hereinafter, circuit breaker) 7 of the corresponding pump, and the closing coil 71 of the circuit breaker 7 is Since it is excited, the breaker contact 72 is closed and the pump 8 is started. At the same time, the closing coil 71 is excited to turn on the closing and hitting contact 73, so that the pump start signal c is input to the field input / output device 6 and set from the field input / output device 6 to the field station 5.

On the other hand, if the operation data is a pump stop request, the circuit breaker 7 outputs the circuit breaker “OFF” contact output b to the circuit breaker 7, and the self-holding of the closing coil 71 is released. As a result, the breaker contact 72 is heard and the pump 8 is stopped. At the same time, the contact for breaking back 74 is turned on by the non-excitation of the closing coil 71, so that the pump stop signal d is input to the on-site input / output device 6 and is set on the on-site station 5.

The data set in the field station 5 is input to the monitoring controller 2 via the multiplex transmission system, and the display symbol of the corresponding pump is switched to the operation display or the stop display.
Displayed on CRT1.

A delay occurs in the transmission of the pump start signal c or the pump stop signal d for exactly the same reason as in the case of the operation data a or b.

In order to reliably perform the inching operation even if there is such a delay in transmission, the monitor control device 2 performs the following processing according to the operator's request input from the CRT 1. That is, as shown in FIG. 3 (a), when an operator's operation request is issued via the CRT 1 (31), the monitoring control device 2 determines that the operation target device is a device requiring inching operation, for example, a rotating machine. It is judged whether there is any (32). As a result, if it is a rotating machine, it is then determined whether the operation request is a start operation (33). In the determination processes (32) and (33), if the determination result is NO, the normal operation process 34 is performed.

This normal operation process 34 is performed as shown in FIG.
After creating operation data according to the operator's request and outputting it to the site input / output device 6 (process 34A), this operation 6
Check the answer back of the operation data from (34B), and enter the answer back to complete the operation (34B).
C). In this normal operation process, the next operation cannot be accepted until the operation is completed (34C).

If YES in the judgment processes (32) and (33), start data for the corresponding device is created and output to the field input / output device 6 (35). In this way, the monitoring controller 2
After the start data output processing (35), until the answer back signal from the field input / output device 6 is input,
Subsequently, a judgment (36) is made as to whether or not there is a stop request from the operator. As a result, when the stop request is input, the stop operation process of the corresponding device is performed in the normal operation process 34. That is, without waiting for the answer back signal of the start data, the monitor control device 2 creates the stop signal data and outputs the stop data to the field input / output device 6 via the own station 3, the multiplex transmission cable 4 and the field station 5. (34
A), waiting for the answerback signal input (34B), and the operation is completed (34C).

On the other hand, in the determination process 36, if there is no stop request,
The input of the answer back signal is judged (37) as in the normal start request processing, and the operation is completed.

As described above, the monitoring control device 2 performs the starting process if the operator makes a request for starting the rotating machine, and if there is a stop request from the operator before inputting an answerback to the start output, the monitor control device 2 stops the process. The operation is received only upon request, and the stop operation is performed based on the normal processing. Therefore, when the operator performs the inching operation of the rotating machine, the stopping operation is accepted only for the stopping operation after the starting operation, so that the inching operation similar to the conventional system can be performed by the continuous operation of start → stop. It will be possible.

FIG. 4 shows the monitoring control device 2 during the above inching operation,
It shows a signal flow between the circuit breakers 7. However, in the figure, the multiplex transmission cable 4 and other field station 5
Is omitted. In this figure, when the operator makes a start request a ₀ for the rotating machine via the CRT 1 provided in the central control room, a command is input to the monitoring control device 2, and this is input from the site input / output device 6 to the power breaker 7. On the other hand, it is output as a breaker closing signal a. The time delay of this route is T ₁ .

In this start-up process, when the on-site input / output device 6 receives the start-up data, it sends the start-up data return signal c ₀ as an answerback to the monitoring controller 2. The droplet-back signal c ₀ is required monitoring controller time T ₁ in until returned to 2, total by the time the operator enters the signal c ₀ Uchikaeshi after performing the activation request a ₀ 2T You need ₁ hour. Therefore, in the conventional system, the next operation by the operator was not accepted during this 2T ₁ , but in the case of the present embodiment, the operation is accepted only for the operation request of start-up / stop of the rotating machine as described above. Therefore, as shown in the figure, after the start request a ₀ , the stop request b ₀ can be successively issued. This stop request b ₀ is output to the site input / output device 6 through the same route as the start request a _0, and the circuit breaker disconnection signal b is output to the power source circuit breaker 7 to open the circuit breaker and the corresponding device Stop.

Since the on-site input / output device 6 always returns the input data, the return data d is also transmitted to the monitor control device 2 even for the stop data. The actual device is T ₁ + when the operation delay time of the device is α ₁ with respect to the start signal a ₀ .
Start with alpha ₁ delay, also, T ₁ against stop request b ₀
Stop after a delay of + α ₁ . Monitoring in the central operation will be performed with a delay of T ₁ with respect to the movement of the equipment.

The operating time T ₂ ′ of the field equipment in this inching operation is set to the 5th
This will be described with reference to the time chart in the figure. When the operator makes a start request a _{0 at} timing t ₁ , data a ₁ is input to the on-site input / output device 6 at timing t ₂ and timing t ₄
Then, the circuit breaker ON command a is output to the circuit breaker 7.
Then, after the operation delay time α ₁ , the device starts at timing t ₅ and enters the device operating state. During this time, the operator makes a stop request b ₀ at timing t ₃ after a time interval T ₃ after the start operation.
Perform the operation. This stop request signal b _{1 is} also input to the site input / output device 6 at the timing t ₆ with the same time delay as at the time of the start request, and the breaker cutoff command b is output at the timing t ₇ . Then, after the operation delay time α ₁ , the device first enters the stopped state at timing t ₈ .

Therefore, in FIG. 5, timing t ₁ (start request)
When each timing is expressed with reference to, the equipment start timing is T ₁ + α ₁ (1) equation, and the equipment stop timing is T ₃ + T ₁ + α ₁ (2) equation. Motion time) T ₂ ′
Is T ₂ ′ = (T ₃ + T ₁ + α ₁ ) − (T ₁ + α ₁ ) = T _{3 according to} equation (2)-(1), and the inching time can be determined by the operator's operation interval. Become.

As described above, according to this embodiment, it is possible to perform the inching operation of the on-site rotating machine from the central control room without being affected by the time delay of the transmission system. In addition, even if the supervisory control device cannot receive the answerback signal due to an abnormality in the transmission system,
According to the present embodiment, since the stop operation can be performed, the device can be stopped safely.

By the way, in the above embodiment, the operation of the field input / output device 6 was the same as the conventional one, but the reliability of the inching operation can be improved by providing the field input / output device 6 with the following functions. . This will be described with reference to FIG.

FIG. 6 shows another embodiment of the present invention. In the figure, the same symbols as in FIG. 4 indicate the same parts, and the difference is that the stop request signal b ₁ given to the on-site input / output device 6 is different from that of FIG. AND6 with pump start signal c generated when the circuit breaker 7 operates reliably
The point is that 1 is taken and the pump stop signal b is output. This is because the field I / O device 6 has the confirmation operation that the operator performed based on the lamp or CRT display in the prior art, and after confirming that the circuit breaker is installed, By permitting the above, it is possible to prevent an adverse effect on the circuit breaker and devices (pump, etc.) due to an extremely short breaker on / off operation.

In the above embodiment, the operator's operation input is CR.
Although an example of performing the operation via the T touch screen has been shown, the present invention is not limited to this, and a conventional hard switch may be used, and it does not depend on the type of the switch at all.

Further, in the above-mentioned embodiment, the inching operation of the rotating machine is taken as an example, but the invention can be applied to the case of checking the disconnection of the breaker or the heater.

Further, in the above-mentioned embodiment, the inching operation at the time of instantaneous activation has been described, but it is needless to say that the same can be applied to the case of instantaneous stop on the contrary.

Furthermore, it should be clear that the present invention can be implemented in either soft logic or hardwired relay sequences exactly as well.

[Effects of the Invention] As described above, according to the present invention, it is possible to reliably perform the inching operation of the field equipment that is remotely arranged without being affected by the transmission delay that occurs in the multiplex transmission system in the digital instrumentation control system. Therefore, the burden on the driver can be greatly reduced.

[Brief description of drawings]

FIG. 1 is a block diagram of a remote device operation confirmation apparatus showing an embodiment of the present invention, FIG. 2 is a circuit diagram showing a concrete example of the circuit breaker of FIG. 1, and FIG. 3 is a supervisory control apparatus of FIG. 4 is a flow chart for explaining the processing of FIG. 4, FIG. 4 is an explanatory view of the signal flow of FIG. 1, FIG. 5 is a time chart of FIG. 4, and FIG. 6 is a remote device operation confirmation showing another embodiment of the present invention. It is explanatory drawing of the flow of the signal of an apparatus. 2 ... Supervisory control device, 4 ... Multiplex transmission cable, 6 ... Field input / output device.

Claims (1)

[Claims] 1. A remote control switch for starting / stopping a field device remote from a central control room in a plant, and operation data created in accordance with an operation input of the remote control switch to perform multiplex transmission. It is equipped with a supervisory control device that outputs to the system and a site input / output device that inputs the operation data via the multiplex transmission system and outputs a start / stop signal to the corresponding field equipment. In a remote device operation confirmation device for confirming an operation state of a device, a means for determining a type of a site device to be operated according to an operation input of the remote operation switch, and a field device to be operated from the determination result are predetermined. In the case of a device that is to be operated by inching, the operation input of one of the start / stop operations and the operation input of the other is accepted without an answerback from the field input / output device. And a means based on the one operation input when a signal based on the other operation input is input from the monitor control apparatus to the field input / output device via the multiplex transmission system. The remote device operation confirmation device, wherein the input / output device is provided with means for outputting a signal based on the other operation input to the field device after confirming the operation of the field device with the input / output device.