JP2003316401A - Watching control system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a watching control system which can restrict rights of control of a plant machinery when a plurality of radio terminals can be operated at field-side. <P>SOLUTION: In this system, at the case that a central watching control panel 10 has the rights of control of a plant machinery 80, when an operation that the rights of control are switched from the central watching control panel side to radio terminals 20, 30 by the radio terminal 20, for example, is performed; the terminal 20 is made to notify to another radio terminal 30 and the central watching control panel 10 that the operation is performed. The rights of control are restricted so that only the radio terminal 20 which switched over the rights of control of the plant machinery 80 to the field-side can perform the control and operation of the plant machinery 80, until it abandons the rights of control. Furthermore, when the switching operation is performed by the other radio terminal 30 at the time that the ratio terminal 20 holds the rights of control, the information that the switching operation is performed by the other radio terminal 30 is notified to the radio terminal 20 with the management number of the radio terminal 30. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a supervisory control system for monitoring and controlling plant equipment, and more particularly to a supervisory control system capable of controlling plant equipment at a place where the plant equipment is installed by using a wireless terminal.

[0002]

2. Description of the Related Art In a water treatment system, a traffic control system, etc., in order to monitor and control the water volume and traffic volume at a plurality of places,
The plant equipment to be used is distributed and arranged. The control device (field control panel) for each plant device is installed near the plant device for maintenance and restoration after an accident. Further, since it is more efficient to centrally monitor and control a plurality of plant equipment, a central monitoring room is provided and a monitoring / control device for each plant equipment is installed therein.

FIG. 4 is a block diagram schematically showing the structure of a conventional supervisory control system. Plant equipment 140
As shown in FIG. 4, the monitoring control system 101 that monitors and controls the central monitoring control panel 110 and the site control panel 12
0 and the auxiliary relay board 130.

The central monitoring and control panel 110 is a plant device 1
An operation switch 111 for controlling the 40 is provided.

The field control panel 120 is a plant device 140.
The operation switch 121 for controlling the plant and the control of the plant equipment 140 are controlled by the central monitoring control panel 110 and the field operation panel 1.
The control right changeover switch 122 is provided for switching which of 20 and 20 performs.

The auxiliary relay board 130 is the central monitoring and control board 1
A relay contact or a position (hereinafter, referred to as POS) 131 of a sequencer for transmitting an ON / OFF signal from the operation switch 111 of 10 to the plant equipment 140, and an ON / OFF signal from the operation switch 121 of the field operation panel 120 to the plant equipment. POS 132 transmitted to 140, and central monitoring control panel 110 (center side) / operation panel 120 (site side) from operation switch 122 of site operation panel 120.
A POS 133 that switches between a signal from the POS 131 and a signal from the POS 132 and transmits the signal to the plant equipment 140 according to the control right switching signal of.

In the supervisory control system 101, which one of the central supervisory control panel 110 and the site operation panel 120 retains the control right of the plant equipment 100 in order to prevent accidents during maintenance, etc. Control panel 1
Only 20 can be set. Further, in the supervisory control system 101, the number of operation switches is set to the minimum number in order to simplify the description, but the actual supervisory control system includes a plurality of operation switches.

Next, the operation of the supervisory control system 101 will be described for the case where maintenance is performed on site.

(1) Central → Site Control Right Switching Before the maintenance is performed, the supervisor controls the plant equipment 140 by the central supervisory control panel 110 in the central supervisory room. At this time, the control right of the plant device 140 is controlled by the central monitoring control panel 110 (hereinafter, also referred to as the central side).
In this state, the operation from the site operation panel 120 (hereinafter, also referred to as the site side) is locked.

First, the maintenance staff uses a communication device (for example, a telephone) to inform the supervisor in the central monitoring room that maintenance is to be started, and then the control right changeover switch 122 of the site control panel 120 is centrally operated. Side to the site side.
Along with this, the POS 133 of the auxiliary relay panel 130 installed in the control center is switched to the site side, the operation from the site operation panel 120 to the plant equipment 140 becomes effective, and the operation from the central monitoring control panel 110 is locked. It That is, the control right of the plant equipment 140 is held by the site side.

(2) The plant equipment control maintenance worker turns on the operation switch 121 of the site operation panel 120.
Switch from N to OFF. Along with this, the POS 132 of the auxiliary relay board 130 is switched to OFF, and the control of the plant equipment 140 is executed. That is, the plant device 140 is switched from the operating state to the stopped state by the above operation of the operation switch 121. The maintenance staff performs maintenance when the plant device 140 is stopped.

Next, when the maintenance is completed, the maintenance staff switches the operation switch 121 of the site operation panel 120 from OFF to ON in order to confirm the operation of the plant equipment 140. Along with this, the POS of the auxiliary relay panel 130
132 is switched to ON, and the plant device 140 is controlled. That is, by switching the operation switch 121, the plant device 140 is switched from the stopped state to the operating state. When the plant device 140 is in the operating state, the maintenance staff executes an operation check.

(3) Site-to-central control right switching When the operation confirmation of the plant equipment 140 is completed, the maintenance staff switches the control right to the central supervisory control panel from the site side by operating the operation switch 122 of the site control panel 120. Switch to the center side. As a result, the POS 133 is switched to the center side, and the plant equipment 14 is switched by the central monitoring and control panel 110.
The control from 0 becomes possible, and the operation from the site operation panel 120 is locked. After that, the supervisor in the central monitoring room can monitor and control the plant equipment 140 as usual using the central monitoring and control panel 110.

In the above-mentioned supervisory control system 101, the site operation panel 120 is installed near the plant equipment 140, but it is installed at a slightly distant position. for that reason,
On-site control panel 1 when one maintenance person performs maintenance
The work had to be done back and forth between the 20 and the plant equipment 140. Further, when the maintenance personnel perform maintenance by two persons, the maintenance personnel who operates the site operation panel 120 and the maintenance personnel who confirms the plant equipment 140 must perform the work while communicating with each other through communication equipment. As described above, in any case, inconvenient work is often required.

Therefore, instead of the site operation panel 120, there has been proposed a monitoring control system capable of operating plant equipment by using a wireless terminal. FIG. 5 is a block diagram schematically showing the configuration of a conventional supervisory control system different from that of FIG. As shown in FIG. 5, the plant equipment 21
The monitoring control system 102 for monitoring and controlling 0 includes a central monitoring control panel 150, a wireless terminal 160, and a standby wireless terminal 1.
70, a wireless base station 180, a server 190, and an auxiliary relay board 200.

The central supervisory control board 150 has the same structure as the central supervisory control board 110 of the supervisory control system 101,
Operation switch 15 for controlling the plant equipment 210
1 is provided.

The wireless terminal 160 includes an operation switch 161 for controlling the plant equipment 210, and a central monitoring control panel 150 for controlling the plant equipment 210 and the wireless terminal 1.
60 and the wireless terminal 170, and a control right switching switch 162 for switching between the wireless communication terminal 60 and the wireless terminal 170. The wireless terminal 160 also includes a communication unit 163 for wirelessly transmitting a signal to the auxiliary relay board 200.

The wireless terminal 170 has the same structure as the wireless terminal 160, and includes an operation switch 171 for controlling the plant equipment 210 and a changeover switch 172 for switching the control right of the plant equipment 210. The wireless terminal 170 also includes a communication unit 173 for wirelessly transmitting a signal to the auxiliary relay board 200.

The radio base station 180 is a relay device for transmitting the signals transmitted from the radio terminals 160 and 170 to the server 190. The wireless base station 180 also includes a wireless communication unit 181 for wirelessly communicating with the wireless terminals 160 and 170.

The server 190 includes wireless terminals 160 and 170.
It is a device for converting the control signal from the control signal of the auxiliary relay board 200.

The auxiliary relay board 200 is a central monitoring control board 1
POS 201 that transmits an ON / OFF signal from operation switch 151 of 50 to plant equipment 210, wireless terminal 1
ON from operation switches 161 and 171 of 60 and 170
POS2 that transmits the ON / OFF signal to the plant equipment 210
02 and the operation switches 16 of the wireless terminals 160 and 170
2, 172 switches the signal from the POS 201 and the signal from the POS 202 according to the central / site control right switching signal, and transmits the signal to the plant equipment 210.
The OS 203 is provided.

In the supervisory control system 102, the wireless terminals 160 and 170 can monitor and control the plant equipment included in the on-site operation panel 120 of the supervisory control system 101. In addition to this, it is easily portable. Therefore, it is possible to control the operation and stop of the plant equipment 210 from any place within the range where the radio wave transmitted to the radio base station 180 can reach. Also,
The control right can be easily switched between the central side and the site side.

Therefore, it becomes possible for one maintenance person to perform maintenance or the like at the installation location of the plant equipment 210 while operating the wireless terminal 160, and it has been possible to improve work efficiency such as maintenance.

[0024]

The supervisory control system 10
2 mainly uses the wireless terminal 160 to operate the plant equipment 2
10 was controlled, and the wireless terminal 170 was designed to be used as a spare when the wireless terminal 160 fails. Therefore, the monitoring control system 102 does not have a configuration for preventing duplication of the operations of the wireless terminals 160 and 170, and the plant device 2 is
If both the wireless terminal 160 and the wireless terminal 170 are used during the control of 10, there is a high risk of an accident.

For example, it is assumed that the maintenance person A carries the wireless terminal 160 and the maintenance person B carries the wireless terminal 170.
When the maintenance worker A switches the operation switch 162 of the wireless terminal 160 from the center side to the site side, the control right of the plant equipment 210 is switched to the site side. As a result, the control of the plant equipment 210 and the switching of the control right between the site side and the center side can be operated by the wireless terminal 160 or the wireless terminal 170. Therefore, when the maintenance staff A operates the wireless terminal 160 to perform maintenance on the plant equipment 210, and the maintenance staff B mistakenly operates the wireless terminal 170, the plant equipment 210 becomes Accidents may occur due to unintended operation, which is extremely dangerous.

Therefore, in order to solve the above-mentioned problems, the present invention is directed to a case where a plurality of wireless terminals can be operated on the site side.
An object of the present invention is to provide a supervisory control system capable of limiting the control right of plant equipment.

[0027]

The present invention has the following structure as means for solving the above problems.

(1) A plurality of wireless control means capable of controlling the plant equipment at the installation location, a central monitoring control means for monitoring and controlling the plant equipment, and which of the wireless control means and the central monitoring control means is used. Control right switching means for controlling the plant equipment or switching the control right, and management means for managing so that only one wireless control means controls the plant equipment when there is an operation request from the plurality of wireless control means. And wireless relay means for relaying communication between the wireless control means and the management means.

In this configuration, the supervisory control system manages by the management means such that only one wireless control means controls the plant equipment even if there is an operation request from the plurality of wireless control means. Therefore, it is possible to prevent the occurrence of an accident even when the wireless device is erroneously operated on the plant equipment.

(2) The wireless control means includes control right switching means for switching the control right from the central supervisory control means to the wireless control means, and the management means controls the control right of the plant equipment to the plurality of wireless devices. When none of the control means is held, the control right is given only to the wireless control means that has operated the control right switching means, and the operation of the other wireless control means is invalidated after the control right is given. Is characterized by.

In this configuration, when the control right of the plant equipment is not held by any of the plurality of wireless control means, the control right is given only to the wireless control means that has been operated by the control right switching means, and the control is performed. After the right is granted, the operation of other wireless control means is invalidated. Therefore, since only the wireless control means that has operated the control right switching means retains the control right of the plant equipment, the operator of the wireless control means does not operate the plant equipment even if an operation is performed from another wireless terminal. It is possible to work without worrying about the occurrence of an accident.

(3) The management means is provided with an emergency operation means capable of releasing the control right given to the wireless control means.

In this structure, the control right given to the wireless control means can be released by the emergency operation means. Therefore, if the wireless control means holding the control right of the plant equipment fails, the emergency operation means can be operated to release the control right of the plant equipment, without resetting the entire supervisory control system. It becomes possible to operate the plant equipment by other wireless control means.

(4) The management means issues an operation request for starting an operation with one wireless control means when the control right of the plant equipment is not held by any of the plurality of wireless control means. Then, the fact that there is an operation request from the wireless control means is notified to another wireless control means.

In this configuration, when none of the plurality of wireless control means has the control right of the plant equipment and there is an operation request for starting the operation by one wireless control means, the management means Notifies other wireless control means to that effect. Therefore, it becomes possible for the operator of the other wireless control means to know that the wireless control means that has made an operation request will retain the control right for the plant equipment.

(5) The management unit holds the control right when one of the wireless control units holds the control right of the plant equipment and when there is an operation request from another wireless control unit. The wireless control means is informed that there is an operation request from another wireless control means.

In this configuration, when one wireless control means holds the control right of the plant equipment, the management means receives the control right from another wireless control means, and the wireless holding the control right. The control means is notified that there is an operation request from another wireless control means. Therefore, the operator of the wireless terminal holding the control right of the plant equipment can confirm with the operator of the wireless terminal that has made the operation request whether or not the control right of the plant equipment needs to be released. Becomes

(6) The management means includes a clock means for clocking a predetermined fixed time, and when one of the wireless control means holds the control right of the plant equipment, the wireless control means controls the plant. When there is a device operation request, other wireless control means and the central monitoring control means are notified of that fact, and the time counting means starts time counting, and after the time counting means completes the time counting, the plant equipment It is characterized by performing an operation.

In this configuration, when one wireless control means holds the control right of the plant equipment and the wireless control means makes an operation request for the plant equipment, the other wireless control means and the central supervisory control are performed. Notifying the means to that effect, the timekeeping means starts the timekeeping, and after the timekeeping means completes the timekeeping, the plant equipment is operated. Therefore, it can be understood that the operation of the plant equipment is started by the wireless control means. If it is better not to operate the plant equipment, it is possible to request the operator of the wireless control means to stop the operation.

(7) The management means notifies the accident detection means for detecting the occurrence of an accident in the plant equipment, and to the all wireless control means and the central monitoring control means when the accident detection means detects an accident. And a notification means for notifying.

In this configuration, when the accident detection means detects that an accident has occurred in the plant equipment, the notification means notifies all wireless control means and the central monitoring control means of the occurrence of the accident. Therefore, a person involved such as a plant equipment monitor or a maintenance person can immediately grasp the occurrence of the accident, and can quickly act on the accident.

[0042]

1 is a block diagram schematically showing the configuration of a supervisory control system according to an embodiment of the present invention. In the present invention, in order to limit the wireless terminals that can control and operate the plant equipment when a plurality of wireless terminals can be controlled and operated on the site side where the plant equipment is installed, in particular, the server 190 of the monitoring control system 102 is used. It is an improved version. The details will be described below.

As shown in FIG. 1, the supervisory control system 1 for supervising and controlling the plant equipment 80 includes a central supervisory control board 10 which is a central supervisory control means, a radio terminal 20 and a radio terminal 30 which are radio control means, A wireless base station 40 that is a wireless relay unit, a server 50 that is a management unit, a liquid crystal touch panel 60 that is an emergency operation unit, and an auxiliary relay panel 70.
It is composed by. Note that the number of wireless terminals is not limited to two, and a configuration using a plurality of wireless terminals may be used.

The central supervisory control board 10 is a plant equipment 80.
An operation switch 11 for controlling the display and a display unit 12 for displaying information to be transmitted to an observer are provided.

The wireless terminal 20 includes an operation switch 21 for controlling the plant equipment 80 and a control right changeover switch 22 for switching the control right of the plant equipment 80. The wireless terminal 20 also includes a communication unit 23 for communicating with the wireless base station 40, a display unit 24 for displaying information transmitted to maintenance personnel, and a storage unit 25 for storing the assigned management number.

The wireless terminal 30 has the same configuration as the wireless terminal 20, and includes an operation switch 31 for controlling the plant equipment 80 and a changeover switch 32 for switching the control right of the plant equipment 80. The wireless terminal 30 also includes a communication unit 3 for communicating with the wireless base station 40.
3, a display unit 34 for displaying information transmitted to maintenance personnel, and a storage unit 35 for storing the assigned management number.

The wireless terminals 20 and 30 are portable in size. In addition, a management number for managing each wireless terminal is given to the wireless terminals 20 and 30 in advance.

The radio base station 40 is a relay device for transmitting the signals transmitted from the radio terminals 20 and 30 to the server 50. In addition, the wireless base station 40 is connected to the wireless terminal 20.
And a wireless communication unit 41 for wirelessly communicating with the wireless terminal 30.
Is equipped with.

The server 50 is a device for converting control signals from the wireless terminals 20 and 30 into control signals for the auxiliary relay board 70. Further, the server 50 limits the wireless terminals that can control the plant equipment 80. Further, the server 50
It is possible to release the control lock of the wireless terminal and maintain the monitoring control system. Server 50
Is a control priority table 51, a priority table management unit 52,
A control lock check unit 53, a maintenance unit 54, a monitoring unit 55 that is an accident detection unit, a notification unit 56 that is a notification unit, and a timer 57 that is a time counting unit are provided.

The control priority table 51 is used for the plant equipment 8
It is a table which records information such as a management number of a wireless terminal whose control right of 0 is switched to the site side. The priority table management unit 52 manages the control priority table 51 to prevent control right switching from a wireless terminal that has switched control right.
Also, it outputs a signal to the notification unit 56. The control lock check unit 53 uses the plant equipment 80 transmitted from the wireless terminal.
It is confirmed whether or not the operation can be executed, and if it is possible, a signal is output to the auxiliary relay panel 70, and if it is not possible, the fact is returned to the wireless terminal. The maintenance unit 54 causes the liquid crystal touch panel 60 to display predetermined contents. Further, the maintenance unit 54 forcibly releases the control lock when there is an operation for releasing the control lock from the liquid crystal touch panel 60.
The monitoring unit 55 monitors the operation of the plant equipment 80, and when an abnormality such as an accident occurs in the plant equipment 80, the notification unit 5
The signal is output to 6. The notification unit 56 makes a predetermined notification to the wireless terminals 20, 30 and the central monitoring control panel 10 in response to signals from the priority table management unit 52, the control lock check unit 53, and the monitoring unit 55. The timer 57 is for measuring a predetermined fixed time.

The liquid crystal touch panel 60 is provided with a display section 61 and an operation section 62, and the operation section 62 can be operated according to the contents displayed on the display section 61 to make an input. In addition, the liquid crystal touch panel 60 displays the server 50 on the display unit 61.
The data transmitted from the maintenance unit 54 is displayed. Further, the operation content from the operation unit 62 is transmitted to the maintenance unit 54.

The auxiliary relay board 70 is the central monitoring and control board 10.
POS 71 transmitting the ON / OFF signal from the operation switch 11 of the wireless communication terminal 20 to the plant equipment 80, the POS 72 transmitting the ON / OFF signal from the operation switches 21 and 31 of the wireless terminals 20 and 30 to the plant equipment 80, and the wireless terminal 2
Control right switching means for switching the signal from the POS 71 and the signal from the POS 72 according to the central / site control right switching signal from the operation switches 22 and 32 of 0 and 30 and transmitting the signal to the plant equipment 80. POS73
Is equipped with.

In the supervisory control system 1, the wireless terminal 2
0 and 30 can be easily carried. Therefore,
It is possible to control the operation and stop of the plant equipment 80 from any place within the range where radio waves can reach. Further, the control right between the central side and the site side can be easily switched.

In the supervisory control system 1, the plant equipment 8 is used to prevent accidents during maintenance.
The wireless terminal 2 determines which of the central supervisory control panel 10 and the wireless terminals 20 and 30 can have the control right.
Only 0 and 30 can be set. Further, in the supervisory control system 1, the number of operation switches is set to the minimum number in order to simplify the description, but the actual supervisory control system includes a plurality of operation switches.

The monitoring control system 1 has the following functions in addition to the functions of the conventional monitoring control system 102. That is, 1. When the control right of the plant equipment 80 is on the central monitoring control panel 10 side (hereinafter, also referred to as the central side), for example, the control right is given from the wireless terminal 20 from the central side to the wireless terminals 20, 30 side (hereinafter, both on-site side). When the operation to switch to () is performed, the fact that the operation has been performed is notified to the other wireless terminals 30 and the central monitoring and control panel 10. As a result, the maintenance personnel holding another wireless terminal can understand that the site side has the control right for the plant equipment 80.

2. The control right is limited so that only the wireless terminal 20 that has switched the control right of the plant equipment 80 to the site side can control and operate the plant equipment 80 until the control right is abandoned. Thus, even if the wireless device is accidentally operated on the plant equipment 80, an accident can be prevented.

3. When the wireless terminal 20 holds the control right and another wireless terminal 30 operates a switch,
The operation from another wireless terminal 30 is notified to the wireless terminal 20 together with the management number of the wireless terminal 30 (control right release request). As a result, the operator of the wireless terminal 20 sends the operator of the wireless terminal 30 the plant equipment 8
It is possible to confirm whether the control right of 0 needs to be released.

4. When another wireless terminal 30 operates a switch while the wireless terminal 20 holds the control right, the wireless terminal 20 indicates that the wireless terminal 20 holds the control right.
The wireless terminal 30 is notified of the management number. As a result, the operator of the wireless terminal 30 can confirm that the operator of the wireless terminal 20 has the control right.

5. When the operation switch is operated on the wireless terminal 20 that holds the control right, another wireless terminal 30,
Also, the central monitoring and control panel 10 is notified of an alarm for a certain period of time. As a result, the plant equipment 80
It can be understood that the control operation of is performed. If it is better not to control the plant equipment 80, the operator of the wireless terminal 20 can be requested to cancel the operation.

6. When an accident occurs in the plant equipment 80, an accident occurrence notification is given to each wireless terminal and the central monitoring and control panel 10 until it is canceled by the server 50.
As a result, a person concerned such as a monitoring person and a maintenance person of the plant equipment 80 can immediately grasp the occurrence of the accident and can quickly act on the accident.

Further, by the above function, when the maintenance staff uses the wireless terminal to perform maintenance on site,
Since an operation from another wireless terminal is locked, it is possible to prevent an accident from occurring due to an erroneous operation on the other wireless terminal. further,
The various notification functions described above enable the maintenance staff to know that there is an operation request from another wireless terminal or that an accident has occurred, so that the maintenance staff can quickly respond to the notification.

Next, a specific operation of the monitor control system 1 will be described with reference to FIGS. 2 and 3 by taking an example of a case where an accident occurs at the site and the recovery is performed. 2 and 3
3 is a flowchart for explaining the operation of the monitoring control system 1.

(1) Notification of Accident Occurrence Prior to the occurrence of an accident, the observer carried out supervisory control of the plant equipment 80 by means of the central supervisory control board 10 in the central supervisory room. Further, the maintenance personnel A and the maintenance personnel B carry the wireless terminal 20 and the wireless terminal 30, respectively, and stand by at the site to carry out maintenance of the plant equipment 80. At this time, the control right of the plant equipment 80 is on the center side, and in this state, the operation from the site side is locked.

As shown in FIG. 2, when an accident occurs in the plant equipment 80 and the operation is stopped (s1), the monitoring unit 55 of the plant equipment 80 detects an abnormality and sends an abnormality detection signal to the notification unit 56. (S2). Upon receiving this signal, the notification unit 56 notifies all wireless terminals via the wireless base station 40 that an accident has occurred. Further, the central monitoring and control panel 10 is notified that an accident has occurred (s3). The display unit 24 of the wireless terminal 20, the display unit 34 of the wireless terminal 30, and the display unit 12 of the central monitoring and control panel 10 display that an accident has occurred in the plant equipment 80 by this notification (s4). This display is performed until the accident occurrence display on the display unit is canceled (s5).

(2) Central-to-Site Control Right Switching The supervisor in the central monitoring room contacts the maintenance personnel A on the site by means of communication equipment, and instructs the maintenance personnel A on the site to restore the plant equipment 80. Upon receiving this instruction, the maintenance worker A first, as shown in FIG. 3, controls the control right changeover switch 2 of the wireless terminal 20.
2 is operated to switch the control right of the plant equipment 80 to the site side (s11). At this time, this information is transmitted to the wireless base station 4
It is transmitted to the server 50 via 0. In the server 50,
The priority table management unit 52 confirms the control priority table 51 (s12). Then, the priority table management unit 52
It is confirmed that there is no wireless terminal to which the control right of the plant device 80 is given and that another wireless terminal has not already operated the control right changeover switch.

Since the control right changeover switch 22 was operated (s14), the priority table management unit 52 gives the wireless terminal 20 a priority and records it in the control priority table 51 (s15). . As a result, the wireless terminal 20 retains control of the plant equipment 80.

Then, the timer 57 is activated to start counting a predetermined time (s16). Moreover, the operation valid signal including the information of the management number of the operated wireless terminal 20 is output to the notification unit 56 (s17). When the notification unit 56 receives this signal, the control right changeover switch of the wireless terminal 20 is operated by the wireless base station 40 to the wireless terminal 30, which is another wireless terminal, and to the central monitoring and control panel 10, so that a predetermined operation is performed. The transfer of control right to the wireless terminal 20 is transmitted after a lapse of time. Upon receiving this notification, the wireless terminal 30 displays the above information on the display unit 34. The information transmitted from the notification unit 56 is also displayed on the display unit 12 of the central monitoring and control panel 10 (s18).

When the timer 57 finishes counting the predetermined time (s19), the priority table management unit 52 outputs a signal to the POS 73 of the auxiliary relay board 70. With this signal,
The POS 73 is switched and the control right is switched to the site side (s20).

(3) The plant equipment control maintenance personnel A and B perform the restoration work of the plant equipment 80,
The work is completed. At this time, the maintenance worker B makes the plant equipment 80
When the operation switch 31 of the wireless terminal 30 is operated by mistakenly assuming that the wireless terminal 30 can be operated (s11), the wireless terminal 30
An operation signal including information on the management number stored in the storage unit 35 is output from the communication unit 33, and is transmitted to the control lock check unit 53 via the wireless base station 40. The control lock check unit 53 confirms the information in the control priority table 51, and confirms the management number of the wireless terminal holding the control right of the plant equipment 80 (s12). As a result of confirmation,
Since the wireless terminal 20 has the control right and the operation from other wireless terminals is locked, the operation is invalid (s13). Therefore, the control lock check unit 53
An operation invalidation signal including information of the management number of the operated wireless terminal 30 is output to the notification unit 56 (s21). Notification unit 5
Upon receiving this signal, the 6 transmits a signal for displaying that the operation is invalid on the display unit 24 of the wireless terminal 30 via the wireless base station 40 (s22). Further, a signal is transmitted so that the display unit 34 of the wireless terminal 20 displays that there is an operation request from the wireless terminal 30 (s2).
3). When the wireless terminal 20 and the wireless terminal 30 receive the signal from the notification unit 56, the display unit 24 displays the above contents.
And are displayed on the display unit 34, respectively. Further, the maintenance person A notifies the maintenance person B that the control operation of the plant equipment 80 cannot be performed from the wireless terminal 30.

Subsequently, the maintenance worker A operates the operation switch 2 of the wireless terminal 20 in order to confirm the operation of the plant equipment 80.
Switch 1 from OFF to ON. The wireless terminal 20 outputs an operation signal including the information of the management number stored in the storage unit 25 from the communication unit 23 (s11). This operation signal is sent to the control lock check unit 53 via the wireless base station 40.
Be transmitted to. The control lock check unit 53 confirms the information in the control priority table 51, and confirms the management number of the wireless terminal holding the control right of the plant equipment 80 (s).
12). As a result of the confirmation, the wireless terminal 20 is the plant equipment 80.
The operation is valid because it holds the control right of (s1
3). Further, since the control lock check unit 53 was not operated by the priority changeover switch 22 of the wireless terminal 20 (s14), the timer 57 is activated to start counting a predetermined time (s16). An operation valid signal including information on the management number of the operated wireless terminal 20 is output to the notification unit 56 (s17). Upon receiving this signal, the notification unit 56 receives the wireless terminal 30 via the wireless base station 40.
And other wireless terminals not shown in the figure, and the central monitoring and control panel 10
Is notified that the plant device 80 will change from the stopped state to the operating state after a predetermined time. Upon receiving this notification, the wireless terminal 30 displays the above information on the display unit 34. The information transmitted from the notification unit 56 is also displayed on the display unit 12 of the central monitoring and control panel 10 (s18).

The control lock check unit 53 has a timer 57.
When the measurement of the predetermined time is completed (s19), a signal is output to the POS 72 of the auxiliary relay board 70. With this signal, the POS 72 is switched and a signal for putting the plant equipment 80 into an operating state is transmitted via the POS 73. The plant equipment 80 is switched from the stopped state to the operating state by this signal (s20). When the plant device 140 is in the operating state, the maintenance worker A executes an operation check of the plant device 80 together with the maintenance worker B.

(4) Switching from the site to the central control right When the maintenance worker A completes the operation confirmation of the plant equipment 80, in order to switch the control right to the central monitoring control panel 10,
The control right changeover switch 22 of the wireless terminal 20 is changed over from the site side to the center side (s11). At this time, this information is transmitted to the server 50 via the wireless base station 40. In the server 50, the priority table management unit 52 checks the control priority table 51 to check the information on the management number of the wireless terminal holding the control right of the plant equipment 80 (s1).
2). As a result of the confirmation, the priority table management unit 52 matches the management number of the wireless terminal holding the control right of the plant equipment 80 with the management number of the wireless terminal that operated the control right changeover switch (s13). ). Further, since the control right changeover switch 22 has been operated (s14), the priority table management unit 52 gives the control right of the plant equipment 80 to the central monitoring control panel 10 and records it in the control priority table 51. Yes (s15). As a result, the central supervisory control panel 10 holds the control right for the plant equipment 80.

Then, the timer 57 is activated to start measuring a predetermined time (s16). Moreover, the operation valid signal including the information of the management number of the operated wireless terminal 20 is output to the notification unit 56 (s17). When the notification unit 56 receives this signal, the control right of the plant equipment 80 is centralized after a predetermined time to the wireless terminal 30 and other wireless terminals (not shown) via the wireless base station 40 and to the central monitoring control panel 10. Notify that the monitoring control panel 10 will be transferred. Then, the notification unit 56
Output signal to. When the notification unit 56 receives this signal, it notifies the wireless base station 40 to the wireless terminal 30 which is another wireless terminal.
The fact that the control right changeover switch of the wireless terminal 20 has been operated is transmitted to the central monitoring and control panel 10 directly via (s18).

Upon receipt of this notification, the wireless terminal 30 displays the above information on the display unit 34. Further, the information transmitted from the notification unit 56 is also displayed on the display unit 12 of the central monitoring and control panel 10.

When the timer 57 finishes counting the predetermined time (s19), the priority table management section 52 outputs a signal to the POS 73 of the auxiliary relay board 70. With this signal,
The POS 73 is switched so that the central supervisory control panel 10 holds the control right of the plant equipment 80 (s2
0). As a result, the plant equipment 80 can be controlled by the central monitoring and control panel 10, and the operations from the wireless terminals 20 and 30 are locked. From this point onward, the supervisor in the central monitoring room will use the central monitoring and control panel 10 to operate the plant equipment 80 as usual.
Monitor and control

(5) In the wireless terminal failure monitoring and control system 1, if the wireless terminal 20 holds the control right for the plant equipment 80, the wireless terminal 2
If 0 fails, the problem that the control right of the plant equipment 80 cannot be switched occurs. Therefore, the monitoring control system 1 includes a maintenance unit 54 in the server 50 and a liquid crystal touch panel 60 for issuing an instruction to the maintenance unit 54. The maintenance unit 54 unlocks the control right of the plant equipment 80, switches the control right of the plant equipment 80 between the site side and the central side (control of the POS 73), the plant equipment 8
It is possible to monitor and control 0.

Therefore, when the wireless terminal 20 that holds the control right of the plant equipment 80 fails, the liquid crystal touch panel 60 is operated to unlock the control right of the plant equipment 80, forcibly. Control priority table 5
Since the information regarding the wireless terminal 20 recorded in No. 1 is deleted, the control right of the plant equipment 80 is controlled by operating the control right changeover switch 32 of the wireless terminal 30.
Since 0 is held, the plant device 80 can be operated using the wireless terminal 30.

When it is not necessary to operate the plant equipment 80 on the site side, the central supervisory control panel 10 is operated by switching the control right of the plant equipment 80 from the liquid crystal touch panel 60 to the central side. The control right of the plant equipment 80 can be transferred to.

Further, when the wireless terminal 20 has broken down but the plant equipment 80 needs to be operated on the site side,
Since the plant equipment 80 can be monitored and controlled using the liquid crystal touch panel 60, workability is reduced, but
Subsequently, restoration work and maintenance of the plant equipment 80 can be carried out on the site side.

The control priority table 51 of the server 50
Is a wireless terminal 2 capable of controlling the plant equipment 80.
The information of other wireless terminals such as 0, 30 and the management number may be registered, and the wireless terminals capable of holding the control right of the plant equipment 80 may be set only in the registered wireless terminals.

[0081]

According to the present invention, the following effects can be obtained.

(1) In the supervisory control system, even if there is an operation request from a plurality of wireless control means, only one wireless control means manages the plant equipment by the management means, so that the other erroneous operations are erroneously performed. Accidents can be prevented even when the plant equipment is operated from the wireless terminal.

(2) When the control right of the plant equipment is not held by any of the plurality of wireless control means, the control right is given only to the wireless control means that has operated the control right switching means, and the control right is given. After that, the operation of other wireless control means is invalidated. As a result, only the wireless control means that has operated the control right switching means retains the control right of the plant equipment, so that the operator of the wireless control means does not operate the plant equipment even if there is an operation from another wireless terminal. Therefore, it is possible to work without worrying about an accident.

(3) Since the control right given to the wireless control means can be released by the emergency operation means, when the wireless control means holding the control right of the plant equipment breaks down, the emergency operation means is operated. You can operate it to release the control right of the plant equipment, without resetting the entire supervisory control system,
Other wireless control means can operate the plant equipment.

(4) When none of the plurality of wireless control means has the control right of the plant equipment and there is an operation request for starting the operation by one of the wireless control means, the management means: This is notified to other wireless control means. As a result, the operator of the other wireless control means can understand that the wireless control means that has requested the operation holds the control right for the plant equipment.

(5) When one radio control means holds the control right of the plant equipment, the management means holds the control right when there is an operation request from another radio control means. Notify that there is an operation request from another wireless control means. As a result, the operator of the wireless terminal holding the control right of the plant equipment can confirm with the operator of the wireless terminal that has made the operation request whether or not the control right of the plant equipment needs to be released.

(6) When one wireless control means holds the control right of the plant equipment and this wireless control means issues an operation request for the plant equipment, the other wireless control means and the central supervisory control means are sent. Notifying that effect, the clocking means starts the clocking, and after the clocking means completes the clocking, the plant equipment is operated. Thereby, it can be understood that the operation of the plant equipment is started by the wireless control means. When it is better not to operate the plant equipment, the operator of the wireless control means can be requested to cancel the operation.

(7) When the accident detection means detects that an accident has occurred in the plant equipment, the notification means notifies all wireless control means and the central monitoring control means of the occurrence of the accident. As a result, a person involved such as a plant equipment monitor or a maintenance person can immediately grasp the occurrence of the accident and can quickly act on the accident.

[Brief description of drawings]

FIG. 1 is a block diagram schematically showing a configuration of a supervisory control system according to an embodiment of the present invention.

FIG. 2 is a flowchart for explaining the operation of the supervisory control system 1.

FIG. 3 is a flowchart for explaining the operation of the monitoring control system 1.

FIG. 4 is a block diagram schematically showing a configuration of a conventional supervisory control system.

FIG. 5 is a block diagram schematically showing a configuration of a conventional monitoring control system different from that of FIG.

[Explanation of symbols]

1, 101, 102: Supervisory control system 20, 30, 160, 170: Wireless terminals 50, 190: Server 51: Control priority table 52: Priority table management unit 53: Control lock check unit 54: Maintenance Department 55: Monitoring unit 56: Notification unit 57: Timer

Claims (7)

[Claims] 1. A plurality of wireless control means capable of controlling plant equipment at an installation site, a central monitoring control means for monitoring and controlling the plant equipment, and which of the wireless control means and the central monitoring control means is the plant. Control right switching means for controlling the device or switching the control right, and 1 when there is an operation request from the plurality of wireless control means.
A supervisory control system comprising: a management unit that manages only one wireless control unit to control the plant device; and a wireless relay unit that relays communication between the wireless control unit and the management unit. . 2. The wireless control means comprises control right switching means for switching control right from the central supervisory control means to the wireless control means, and the management means controls the control rights of the plant equipment to the plurality of wireless controls. When none of the means is held, it is possible to grant the control right only to the wireless control means that has operated the control right switching means, and invalidate the operation of the other wireless control means after the control right is given. The supervisory control system according to claim 1, wherein 3. The supervisory control system according to claim 1, wherein the management unit includes an emergency operation unit capable of canceling the control right given to the wireless control unit. 4. The management means issues an operation request for starting operation with one wireless control means when none of the plurality of wireless control means holds the control right of the plant equipment. The monitoring control system according to any one of claims 1 to 3, wherein the wireless control means notifies another wireless control means that an operation request has been made. 5. The management unit holds the control right when one of the wireless control units holds the control right of the plant equipment and receives an operation request from another wireless control unit. 5. The supervisory control system according to claim 1, wherein the wireless control means is informed that there is an operation request from another wireless control means. 6. The managing means includes a clocking means for clocking a predetermined fixed time, and when one of the wireless control means holds the control right of the plant equipment, the wireless control means causes the plant equipment to operate. When the operation request is issued, the wireless control means and the central supervisory control means are notified of that fact, and the time counting means starts time counting, and after the time counting means completes the time counting, the operation of the plant equipment is started. The supervisory control system according to any one of claims 1 to 5, wherein 7. The management means notifies an accident detection means for detecting the occurrence of an accident in the plant equipment, and notifies all wireless control means and central monitoring control means to that effect when the accident detection means detects an accident. The monitoring control system according to any one of claims 1 to 5, further comprising: