JP2003029821A - Monitor controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a monitor controller capable of guaranteeing the arrival certainty or quickness of plant data as a whole system, and efficiently utilizing a transmission band by allowing a controller part to have a time guaranteeing mechanism. SOLUTION: A data editing part 19 edits process data for the present cycle and process data for the past fixed period inputted from a plant process 12 as a transmission text based on monitor information from a system state monitoring part 20, and a real time data transmitting part 21 transmits the transmission text edited by the data edit part 19 to an operator interface part 15. Thus, even when the data to be transmitted through a transmission path 14 to an operator interface part 15 are lost, the data can be restored.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a monitoring control device for monitoring and controlling a plant process. 2. Description of the Related Art For example, in a monitoring and control apparatus for monitoring and controlling plant processes such as water and sewage facilities, building facilities, factory facilities, and production plants, process data from the plant process is input at a constant cycle. Monitoring and control are performed based on the input process data. FIG. 3 is a block diagram of a conventional supervisory control device 11. Plant process 1 to be monitored and controlled
Reference numeral 2 includes equipment such as a pump and a motor. Process data indicating the operation state of these equipment is input to the controller unit 13 of the monitoring and control device 11. The controller unit 13 controls the plant process by outputting a control command to the equipment of the plant process. [0004] The controller unit 13 includes an operator interface unit 15 and a server unit 16 via a transmission line 14.
It is connected to the. Operator interface unit 15
Has a display device and an input device, displays process data as monitoring information on the display device, and inputs operation commands such as confirmation of a faulty device and operation / stop of a facility device from the input device. Thereby, the target device of the plant process 12 is controlled. [0005] That is, the monitoring and control device 11 includes a controller unit 13 for mainly controlling and an operator interface unit 15.
Reference numeral 5 collects information on the plant process 11 to be monitored and controlled, and monitors the operating state and abnormal state of the equipment. [0006] Operation commands from the operator are transmitted from the operator interface unit 15 to the controller unit 13 via the transmission line 14, and control commands to the equipment are output by the controller unit 13. As a result, an operation / stop command to the equipment of the plant process 11 is issued. On the other hand, the server unit 16 is
And process data received via the transmission line 14, and filing long-term collected data such as forms, trends, and failure histories. In this case, the operator interface unit 1
A commercially available personal computer or workstation is used for the server 5 and the server unit 16, and a transmission line of a predetermined standard is used for the transmission line 14. An industrial programmable controller is used for the controller unit 15. However, in such a supervisory control device 11, the standard of the transmission line 14 is a standard, and a personal computer or a workstation is a general-purpose device, which is required for industrial use. Since there is no processing performance, for example, an arrival time guarantee mechanism, process data cannot be transmitted at high speed and reliably. Therefore, data is lost or delayed, so that it cannot be applied to a large-scale plant or a plant that requires high speed and certainty. [0010] An object of the present invention is to provide a monitoring and control device which can guarantee the reliability and high speed of the plant data as a whole system if the controller has a time guarantee mechanism, and can efficiently utilize the transmission band. That is. [0011] According to a first aspect of the present invention, there is provided a monitoring and controlling apparatus for inputting process data of a plant process at a predetermined cycle and outputting a control command to the plant process. In a monitoring control device including a controller unit and an operator interface unit that is connected via a transmission path and displays and outputs monitoring information based on input process data, the controller unit controls a state of the operator interface unit and the transmission unit. A system status monitoring unit for monitoring, and a data editing unit for editing process data of a current cycle and process data of a fixed period in the past input from a plant process based on monitoring information from the system status monitoring unit as transmission text. , The transmission text edited by the data editing unit A real-time data transmission unit for transmitting a strike to the operator interface unit. In the monitoring control device according to the first aspect of the present invention, the data editing unit includes the process data for the current cycle input from the plant process based on the monitoring information from the system status monitoring unit and the process data for the past fixed cycle. The process data is edited as transmission text, and the real-time data transmission unit transmits the transmission text edited by the data editing unit to the operator interface unit. Thus, even if data transmitted to the operator interface unit via the transmission path is lost, data can be recovered. Embodiments of the present invention will be described below. FIG. 1 is a block configuration diagram of a monitoring control device according to an embodiment of the present invention. Process data from the plant process 12 is collected at predetermined intervals by the process input / output unit 17 of the controller unit 13. The collected data is input to the control unit 18 and the data editing unit 19. The control unit 18 is used for monitoring and control. That is, the control unit 18 outputs a command to the plant process 12 in consideration of the process data and the operator's instruction to the plant process 12 input from the operator interface unit 15, and also changes the state of the plant process 12 to the operator interface unit. 15 to be transmitted. On the other hand, the data editing unit 19 stores data for a certain period in the past from the data inputted in the current cycle, and stores the transmission unit 14 and the operator interface monitored by the system status monitoring unit 20. Part 1
5. In accordance with the state of the server unit 16, the process data for the current cycle and the process data for the past fixed cycle are edited as transmission text. Normally, the currently input data is edited and transmitted from the real-time data transmission section 21 to the operator interface section 15 or the server section 16. On the other hand, the transmission unit 14, the operator interface unit 15,
When a communication failure state occurs in at least one of the server units 16, the data for the past is also edited together with the operator data from the real-time data transmission unit 21 so that the missing data can be restored according to the communication failure state. The data is transmitted to the interface unit 15 and the server unit 16. That is, the operator interface unit 15 receives the data transmitted from the real-time data transmission unit 21, edits the data into monitoring data, and displays it on the display device. The received process data is collected for a long period of time, and a trend, a form, and message history information to be displayed on the operator interface unit 15 at the request of the operator interface unit 15 are created. The system status monitoring unit 20 includes an operator interface unit 15 and a server unit 1 as communication destination devices.
6, and monitors the state of the transmission path 14, notifies the contents to the data editing unit 19 and the real-time data transmission unit 21, and controls the data editing method and data communication timing. The data editing unit 19 mounted on the controller unit 13 receives the process data from the process input / output unit 17 and creates a transmission text as shown in FIG. The real-time data transmission unit 21 receives the data of the data editing unit 19, and
5. The transmission text is transmitted to the server unit 16. As shown in FIG. 2, the transmission text has a header portion, and the header portion holds common information such as a destination and a text length. Also, a serial number is assigned to the transmission text, and a number that is incremented by one is added each time the controller 13 transmits the text. For example, if 100 is added in the current cycle, the number 101 is added next time. Next, in addition to the data “currently transmitted data” input from the plant process 12 in the current cycle and transmitted to the operator interface section 15 and the server section 16, the transmission data section includes the transmission cycle up to n times in the past. , So that data input from the plant process 12 can be included. That is, if the transmission cycle is every 500 ms, the current transmission data time is 12: 30: 00,000 milliseconds, and if the past three times of data are bundled,
The data of the plant process 12 at 12: 29: 59: 500 ms, 12: 29: 59: 000 ms, 12: 29: 58: 500 ms is included. As described above, when transmitting data at the current time, past transmission data can be transmitted at the same time. As shown in FIG. 2, the transmission text is shifted by the past one time in the text data at each transmission timing, and at the time of transmission, data of the past n consecutive times (three times in the above example) from the current transmission data is transmitted to the operator interface unit 15. The data is transmitted to the server unit 16. Here, the system status monitoring unit 20 transmits the communication device (the operator interface unit 15,
The status of the server unit 16) (status such as stop, abnormality, etc.) and the status of the transmission line 14 (status such as stop, abnormality, transmission line load, etc.) are constantly monitored, and the status of the communication device of the transmission destination or the status of the transmission line 14 is received. Alternatively, if communication is not possible, or if the load on the transmission path 14 is equal to or greater than the threshold, the data editing unit 19 is notified that data in the transmission cycle is to be stored, and the real-time data transmission unit 15 is notified of communication suspension. . If the transmission is continuous, the transmission data for the n times that transmission becomes impossible is stored in the transmission text. In FIG. 2, the data text is a data text for n transmission periods (500 ms × n times). Since the collected data is stored in the data editing unit 19 of the controller unit 13 without being overwritten or lost, the system status monitoring unit 20 notifies the real-time data transmission unit 21 of the communication restart when the failure is recovered, and transmits the data. Send. As described above, according to the present invention, even in a non-industrial device such as a transmission line or a personal computer that does not guarantee a fixed period of time, the past text is included in the transmission text on the controller side. Up to n times, even if data loss due to data collision in the transmission path or buffer overwriting due to a delay in reading in the receive buffer of the PC occurs even if data loss occurs due to data collision in the transmission path. Can be guaranteed for the disappearance of. Further, even if a state in which communication cannot be performed due to a stop or an abnormality of a communication device or a transmission path of a transmission destination occurs, data for n times × transmission period can be recovered, and transmission is temporarily stopped when transmission is heavily loaded. By doing so, the transmission state or transmission down due to transmission load overflow can be avoided, and transmission can be used efficiently. Therefore, it is possible to construct a system even on a transmission line with low capability, and since the data reliability is secured on the controller side, it is not necessary to apply expensive dedicated equipment for industrial use to the transmission line and operator interface. A low cost and highly reliable monitoring control device can be configured.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block configuration diagram of a monitoring and control device according to an embodiment of the present invention. FIG. 2 is an explanatory diagram of a transmission text created by a data editing unit according to the embodiment of the present invention. FIG. 3 is a block diagram of a conventional supervisory control device. [Description of Signs] 11 ... Monitoring and control device, 12 ... Plant process, 13 ...
Controller section, 14 transmission line, 15 operator interface section, 16 server section, 17 process input / output section, 18 control section, 19 data editing section, 20 system status monitoring section, 21 real-time data transmission section

Claims (1)

Claims: 1. A controller unit for inputting process data of a plant process at a predetermined cycle and outputting a control command to a plant process, and process data connected to the controller unit via a transmission line and input. A monitoring and control device including an operator interface unit for displaying and outputting monitoring information based on the control unit, wherein the controller unit monitors a state of the operator interface unit and the transmission unit, and the system state monitoring unit A data editing unit that edits process data for the current cycle and process data for a fixed period in the past input from the plant process based on monitoring information from the transmission text, and the transmission text edited by the data editing unit. Send to operator interface Characterized by comprising a that real-time data transmission unit.