JP2001236120A - Masterless control system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make operation instructions transmissible from any of a central controller and a field operation panel to perform monitoring control of plural pieces of plant equipment. SOLUTION: This masterless control system is constituted of a control center 20 with a motor multi-controller 102 to perform monitoring control of the plant equipment 107, the central controller 101 and a field operation panel 105 and transmits the operation instructions from the central controller and the field operation panel to the motor multi-controller, the motor multi-controller is provided with a receiving buffer 102a to receive pieces of transmitted data from each of the central controller and the field operation panel and an operation mode register to set modes of the central controller or the field operation panel, discriminates each piece of the transmitted data based on the set modes, judges whether an abnormality is in the central controller or in the field operation panel by checking healthy signals allocated to the operation instructions and the operation instructions are automatically switched.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a masterless control system, and more particularly to a system for monitoring and controlling plant equipment using a motor such as a pump, a valve and a belt conveyor from a central controller and a field operation panel via a control center. The present invention relates to a technique to be performed based on an operation command.

[0002]

2. Description of the Related Art Conventionally, monitoring and control of plant equipment using a motor such as a pump, a valve, a belt conveyor, etc., are performed based on operation commands from a central controller and a local operation panel via a control center for performing each motor load unit. As a system to perform, a system based on a relay panel consolidation system and a system based on a master-slave system are known. FIG. 7 shows a system based on the relay panel integration system. This system includes a central controller 101 built in a central monitoring console 10 that centrally monitors and controls the control center 20, and a local operation panel 10 for performing manual operation for each device from the device side when the central controller 101 becomes abnormal.
5, control center 20 and central controller 1
01 and a relay panel 104 for collecting operation commands of the on-site operation panel 105 in an external cable. Control center 2
0 receives the operation command sent from the central controller 101 or the on-site operation panel 105 via the relay panel 104,
3 is opened and closed to drive the motor 106 to control the pump 107. Here, the central monitoring console 10 is located in the central monitoring room,
The control center 20 and the relay panel 104 are installed in an electric room, and the on-site operation panel 105 is installed on the site. FIG. 8 shows a processing flow based on the relay panel consolidation method. First,
Since the relay panel 104 integrates the central controller 101 and the local operation panel 105, the control of the pump 107 from the central controller 101 and the local operation panel 105 differs depending on whether the relay panel 104 is normal or abnormal. Relay panel 104, central controller 101 and on-site operation panel 1
When all the values are normal (S101 to S103), the pump 107 can be controlled from the central controller 101 or the on-site operation panel 105 (S105). When the operation panel 105 is abnormal (S103), the central controller 101 can control the pump 107 (S10).
6). The central controller 101 is abnormal (S10
2) When the operation panel 105 is normal (S107), the pump 107 can be controlled from the operation panel 105 (S108). On the other hand, when the relay panel 104 is abnormal (S
101), central controller 101 and on-site operation panel 10
5 cannot control the pump 107 (S109).

FIG. 9 shows a system based on the master-slave system. In this system, the relay panel 104 shown in the system configuration of FIG. 6 is eliminated, and the central controller 101 and the on-site operation panel 105 are directly connected. Therefore, the on-site operation panel 105
Is a system for transmitting the operation command to the control center 20 via the central controller 101. FIG. 10 shows a processing flow according to the master-slave method. The central controller 101 is a master on the transmission line, and the control center 20 and the on-site operation panel 105 are slaves on the transmission line to control the pump 107. Therefore, first, it is determined whether the central controller 101 is normal or abnormal (S2).
01). When the central controller 101 is normal (S201) and the operation panel 105 is normal (S202), the pump 107 can be controlled from the central controller 101 or the operation panel 105 (S204). When the central controller 101 is abnormal (S201), the pump 107 cannot be controlled from the central controller 101 and the on-site operation panel 105 (S203). The central controller 101 is normal (S201) and the local operation panel 105 is abnormal (S20).
In the case of 2), the pump 1 is sent from the central 101 controller only.
07 can be controlled (S205, S206).

[0004]

As a problem in the relay panel consolidation method, a transmission line to the control center 20 is connected to an external cable in order to consolidate operation commands by the relay panel 104. For this reason, an additional number of external cables and an additional relay panel 104 are required with the addition of the number of operation commands, resulting in a large construction cost. As a problem in the master-slave method, the central controller 101
Is used as a master, and the motor multi-controller 102 and the field operation panel 105 are used as slaves. A master-slave transmission system called a master-slave relationship is used.
Even if an operation command is transmitted to the pump 107 from the central control unit 101, the pump 107 cannot be controlled from the local operation panel 105.
Further, since the pump 107 cannot receive an operation command from the local operation panel 105, even if the local operation panel 105 is normal, it cannot fulfill its role.

[0005] It is an object of the present invention to provide a masterless control system capable of transmitting an operation command from any of a central controller and a field operation panel in order to monitor and control a plurality of plant equipment.

[0006]

In order to solve the above problems, a control center having a motor multi-controller for monitoring and controlling plant equipment for each load unit, a central controller for centrally monitoring and controlling the control center, A masterless control system consisting of a field operation panel that monitors and controls each device from the plant equipment side, and transmits an operation command from the central controller and the field operation panel to the motor multi-controller, assigning a healthy signal to the operation command, By checking the healthy signal, it is determined whether the central controller is abnormal or the local operation panel is abnormal.Based on this judgment, the operation command is automatically switched to the operation instruction from the local operation panel or the central controller.
Monitor and control plant equipment. Here, the motor multi-controller includes a reception buffer for receiving transmission data from the central controller, a reception buffer for receiving transmission data from the field operation panel, and an operation mode register for setting the mode of the central controller or the mode of the field operation panel. And determines whether the transmission data transmitted to each reception buffer is data from the central controller or data from the local operation panel based on the setting mode of the operation mode register.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a configuration of a masterless control system according to an embodiment of the present invention. The system includes a motor multi-controller 102 and a contactor 103.
, A central monitoring console 10 having a central controller 101 for centrally monitoring and controlling the control center 20, and a field operation panel for performing manual operation for each device from the device side when the central controller 101 is abnormal. 105, a motor 106 and a pump 107. The motor multi-controller 102 includes a reception buffer 102a and a transmission buffer 102b, and the operation panel 105 includes a reception buffer 108a and a transmission buffer 108b.
And an intelligent I / O 108 having

FIG. 2 shows a processing flow according to the masterless system of this embodiment. Motor multi-controller 10
It is determined which operation command of the central controller 101 or the on-site operation panel 105 should be used to control the pump 107 according to the second operation mode (S701). After the determination in S701, the central controller 101 and the local operation panel 1 of the transmission source
05 is normal (S702, S70)
4). If it is determined that the operation is abnormal, the central mode of the operation mode is switched to the local mode in the motor multi-controller 102, and the central mode is switched from the local mode. That is, switching is automatically performed from the central controller 101 to the local operation panel 105 and from the local operation panel 105 to the central controller 101 (S703, S70).
5). As described above, the pump 107 is controlled from the central controller 101 or the on-site operation panel 105 (S70).
6).

FIG. 3 shows a receiving buffer and registers of various memories included in the motor multi-controller 102 for monitoring and controlling plant equipment for each motor load. The devices on the transmission path are represented by station numbers (the station numbers are 0 to 32 in FIG. 3). Motor multi-controller 1
02 is the operation mode 11 as the reception buffer 102a.
2 (central mode 120, field mode 121), healthy signal 113, operation bit 124 (central 122, field 12)
3), open 114, 117, stop 115, 1 indicating device operation
18, closed 116 and 119, and as registers, the previous memory 109, the current memory 110, and the healthy memory 11
1. It has an equipment operation memory 125 and an operation mode register 130 (central mode 131, field mode 132).

The processing flow of this embodiment will be further described with reference to FIGS. FIG. 4 is a schematic diagram showing a processing flow of the masterless system control, and FIG. 5 shows the schematic flow shown in FIG. 4 in detail. In the masterless system control system, as shown in FIG. 4, the motor multi-controller 102 detects an abnormality (S301), an operation mode determination (S401), and a device operation determination (S5).
Step 01) is repeated for the total number of stations on the transmission line.

In the flow of FIG. 5, the total number of stations is I, the central controller 101 on the transmission path is station number 0, and the intelligent I / O 108 is station number 1. The transmission data of the central controller 101, the motor multi-controller 102, and the intelligent I / O 108 allocates data called a healthy signal 113 which is constantly updated.
The flow shown in FIG. 5 will be described. In FIG. 5, (S30
2) to (S307) are detailed flows of the abnormality detection processing flow (S301) shown in FIG. First, the motor multi-controller 102 initializes i serving as a station number counter (S601). Next, a healthy signal 113 is sent from the reception buffer 102a storing transmission data from the central controller 101 and the intelligent I / O 108.
Is read out, the healthy signal 113 is stored in the memory 110 this time (S302), and compared with the contents of the previous memory 109 (S303), and it is determined whether or not the previous healthy signal 113 has been updated. At this time, if the contents of the current memory 110 and the previous memory 109 do not match, the central controller 1
01 or the intelligent I / O 108 is determined to be operating normally. If the healthy signal 113 has been updated last time, 0 (meaning normal) is stored at the i-th of the healthy memory 111 shown in FIG. 2 (S304), and the contents of the current memory 110 are transferred to the previous memory 109. (S
306). When the contents of the previous memory 109 and the current memory 110 match, it means that the central controller 101 or the intelligent I / O 108 is not operating normally, and the i-th one of the healthy memory 111 (means abnormal). Is stored (S305). Subsequently, it is determined whether the content stored in the healthy memory 111 is normal or abnormal (S307). If the content is abnormal, the device of the station number i on the transmission path is determined to be faulty, and the station number is determined. An operation command from i is not accepted.

The abnormality detection processing flow (S30) shown in FIG.
When 1) ends, next, an operation mode determination process (S401) is performed to determine whether the operation command is the central controller 101 or the intelligent I / O 108. As shown in FIG. 3, the motor multi-controller 102 has a memory called an operation mode register 130.
2 is the operation mode 1 from the intelligent I / O 108
Central mode 120 and field mode 121 indicated by 12
Can be switched to maintain the operation place. With respect to operation commands from each device, the central controller 101
Operation command from the center 122 + device operation 114-11
6. Intelligent I / O in operation panel 105
The operation command from 108 is on-site 123 + device operation 117-
119 is stored in the reception buffer 102a for each station number. In the operation mode determination processing flowchart shown in FIG. 5, it is determined whether the transmission data stored in the reception buffer 102a in step (S402) is data from the central controller 101 or data from the intelligent I / O 108. Therefore, the content stored in the operation bit 124 (the center bit 122 or the field bit 12
If 3) matches the central mode 131 or the site mode 132 held in the operation mode register 130, the next device operation process (S501) is performed. If the operation bit 124 does not match the operation mode register 130, the station number i is added without performing the device operation process (S602), and the process returns to the abnormality detection process (S301). Accordingly, for example, when the operation mode register 130 is in the central mode 131, the operation command from the intelligent I / O 108 is received but the device operation process (S501) is not performed.

The operation mode determination processing flow (S
When step 401) is completed, an operation command is sent to the pump 107 next.
Fig. 4 for determining whether the operation is a stop or an operation
Is performed (S501). In the motor multi-controller 102, the reception buffer 10 shown in FIG.
As shown in 2a, there are three operations of open / stop / close for each station number. Note that “open” is an operation command having the same meaning as the driving operation and the on-operation, “stop” is an operation command having the same meaning as the stopping operation and the off operation, and “close” is an operation command having the same meaning as stopping the operation.
Central controller 101 or intelligent I /
Whether the operation command of O108 executes any one of the three operation commands is determined by the device operation determination processing flow (S
The judgment is made in 501). For example, when the operation command is the operation command of the operation of the center 122 of the own station + the operation of the pump 107, the stop (off) of the own station (S502) and the close of the own station (S50) are performed.
Since it is not the operation command of 4), (S506) corresponds at first. The result determined in (S506) is that the station number is 0 114
Is turned ON and the station number 0 stop 115 and the station number 0 closed 116 are turned off.
F (S507). The operation command is sent to the central controller 101 in the motor multi-controller 102.
Is determined to be the operation command of the pump 107, and the contactor 103 in the control center 20 is turned on. If the operation command is an operation command for stopping (turning off) the center 122 + the pump 107 (S502), the station number 0 stop 115 is turned on, and the station number 0 open 114 and the station number 0 close 116 are turned off (S503). . If the operation command is a command for closing the center 122 + the pump 107 (S504), the station number 0 closed 1
16 is turned on, and the station number 0 stop 115 and the station number 0 open 114 are turned off (S505). Operation command is in the center of the own station 12
If it is not an operation command to operate the 2+ pump 107 (S
506), and turns off all operation commands of the own station (S5).
08). Next, the number of stations is incremented by 1 (S602).
(S603), and if they are the same, all the processes are completed; if they are different, the process returns to the abnormality detection process (S301), and the flowchart shown in FIG. 4 is repeated for all stations.

Here, the motor multi-controller 102
Determines whether the content stored in the healthy memory 111 in FIG. 5 is normal or abnormal (S30).
7) In particular, when the received healthy signal 119 of the central controller 101 is interrupted and the central controller 101 determines that the central controller 101 is abnormal, the central controller 101 is automatically switched from the central mode 131 to the local mode 132 due to the abnormality of the central controller 101, and the local operation is performed. The pump 107 can be controlled by the panel 105 and the control center 20. Similarly, the healthy signal 11 of the intelligent I / O 108 being received
9 is interrupted and it is determined that the on-site operation panel 105 is abnormal.
To the central mode 131, and the central controller 101 and the control center 20 control the pump 107.
Monitoring control.

As described above, in the masterless control system including one central controller, one intelligent I / O, and one motor multi-controller, abnormality detection processing (S301), operation mode determination processing (S401), and equipment operation determination processing (S501). ), A plurality of central controllers or a plurality of intelligent I / Os
The same applies to the case where a plurality of motor multi-controllers are installed and the processing is repeated for the number of stations. Here, in a case where a plurality of central controllers or a plurality of intelligent I / Os and a plurality of motor multi-controllers are installed, when transmitting / receiving operation commands from the plurality of central controllers and the plurality of local operation panels to the motor multi-controller, Set to receive only operation commands from any central controller and local operation panel. In this case, only an operation command from an arbitrary central controller and a local operation panel is received. Also, multiple central controllers or multiple intelligent I / Os
And when a plurality of motor multi-controllers are installed, when transmitting and receiving operation commands from the plurality of central controllers and the plurality of local operation panels to the motor multi-controller, priority is given to the plurality of central controllers and the local operation panel. . In this case, an operation command from the central controller and the field operation panel having a higher priority is received, and as long as the operation command is received, an operation command from another central controller or the field operation panel is not received. Also,
If the motor multi-controller 102 has a plurality of central controllers 101 or a plurality of intelligent I / Os 108
When an operation command is received, the processing flow shown in FIG. 4 is performed, and a plurality of operation commands are collected by the OR circuit 125 shown in FIG.
03 is turned on / off, and the pump 107 is controlled.

In this embodiment, to simplify the description, the number of devices that can be connected on the transmission path is three in total for the central controller 101, the intelligent I / O 108, and the motor multi-controller 102. Depending on the length and transmission speed, about 32 to 64 motor multi-controllers can be connected.

[0017]

As described above, according to the masterless control system of the present invention, when monitoring and controlling a plurality of plant equipment, an operation command can be transmitted from either the central controller or the on-site operation panel. Therefore, compared to the conventional relay panel centralized system, even if the number of operation commands is added, it is not necessary to add an external cable and an additional relay panel, and it is possible to greatly reduce the construction cost.
Also, compared to the conventional master-slave method, even if an error occurs in the central controller, the plant equipment can be controlled from the on-site operation panel, enabling autonomous operation of the on-site operation panel, improving system reliability. Can be done.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a masterless control system according to an embodiment of the present invention;

FIG. 2 is a processing flow according to the masterless system of the present invention.

FIG. 3 is a register diagram of a reception buffer and various memories in the motor multi-controller of the present invention.

FIG. 4 is a schematic diagram of the processing flow of the present invention.

FIG. 5 is a detailed diagram of the processing flow of the present invention.

FIG. 6 is an OR circuit diagram applied to the present invention.

FIG. 7 is a configuration diagram of a conventional relay panel centralized system.

FIG. 8 is a processing flow diagram of a conventional relay panel centralized system.

FIG. 9 is a configuration diagram of a conventional master-slave system.

FIG. 10 is a processing flowchart of a conventional master-slave system.

[Explanation of symbols]

10 central control console, 20 control center, 1
01: Central controller, 102: Motor multi-controller, 102a: Reception buffer (motor multi-controller), 102b: Transmission buffer (motor multi-controller), 103: Contactor, 104: Relay board, 10
5 ... field operation panel, 106 ... motor, 107 ... pump, 1
08: intelligent I / O, 108a: reception buffer (intelligent I / O), 108b: transmission buffer (intelligent I / O), 125: OR circuit

Continued on the front page (72) Inventor Hideo Onishi 5-2-1 Omikacho, Hitachi City, Ibaraki Prefecture Inside Omika Works, Hitachi, Ltd. (72) Inventor Tadao Saito 5-2-1 Omikacho, Hitachi City, Ibaraki Prefecture F term (reference) at Hitachi, Ltd. Omika Works 2F076 BA12 BA16 BE04 BE05 BE10 BE17 5H223 AA01 CC08 CC09 DD03 DD05 DD09 EE01 EE08 EE17 EE30 5K048 BA23 CA05 EB02 GB08 HA01 HA02 HA20

Claims (5)

[Claims] 1. A control center having a motor multi-controller for monitoring and controlling plant equipment for each load unit, a central controller for centrally monitoring and controlling the control center, and monitoring and controlling for each equipment from the plant equipment side A masterless control system for transmitting an operation command from the central controller and the field operation panel to the motor multi-controller, comprising allocating a healthy signal to the operation command and checking the healthy signal. Determine whether the central controller is abnormal or the field control panel is abnormal, and automatically switch to an operation command from the field control panel or an operation command from the central controller based on the determination, and monitor and control the plant equipment. Masterless control system. 2. The motor multi-controller according to claim 1, wherein the motor multi-controller includes: a reception buffer for receiving transmission data from the central controller; a reception buffer for receiving transmission data from the local operation panel; An operation mode register for setting a mode of the site operation panel, wherein the transmission data transmitted to the respective reception buffers based on the setting mode of the operation mode register is data from the central controller, A masterless control system that determines whether the data is from an operation panel. 3. The setting according to claim 1, wherein, when transmitting / receiving operation commands to / from the motor multi-controller from a plurality of central controllers and a plurality of local operation panels, only operation commands from an arbitrary central controller and a local operation panel are received. And a masterless control system that receives only operation commands from an arbitrary central controller and a local operation panel. 4. The method according to claim 1, wherein when transmitting / receiving operation commands from / to the plurality of central controllers and the plurality of local operation panels to the motor multi-controller, priority is given to the plurality of central controllers and the local operation panels. A masterless control system characterized by not receiving an operation command from another central controller or a field operation panel as long as an operation command from a high central controller and a field operation panel is received. 5. The method according to claim 1, wherein when transmitting / receiving operation commands to / from the motor multi-controller from a plurality of central controllers and a plurality of on-site operation panels, outputs for a plurality of operation commands for the same application are integrated into one signal. A masterless control system for monitoring and controlling the plant equipment.