JP3417215B2 - Plant control system - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention connects an operation monitoring station and a control station to a communication bus, the operation monitoring station monitors and controls a plant, and the control station sets up a control station. The present invention relates to a plant control system that causes a plant to manufacture products according to a prescribed recipe (how to make). More specifically, the present invention relates to a plant control system in which a recipe setup is improved. [0002] In a conventional plant control system, a special application is created in an operation monitoring station, and an operator reserves a basic prescription from the operation monitoring station. However, this conventional example has the following problems. Since an operator is involved in setting up a prescription, automatic reservation and the same batch processing cannot be repeated and reserved. In addition, the possibility of a setup error increases. There is no system versatility due to the need for special applications in the operation monitoring station. [0003] The present invention has been made to solve the above-mentioned problems, and an automatic reservation is set up by setting up a prescription from the control station side, not from the operation monitoring station. It is intended to realize a plant control system in which the same batch processing can be repeatedly reserved and the possibility of setup errors is low, and there is no need to build a special application program for recipe setup on the operation monitoring station. I do. SUMMARY OF THE INVENTION The present invention connects an operation monitoring station and a control station to a communication bus, wherein the operation monitoring station monitors and controls the plant, and wherein the control station performs the set up prescription. In a plant control system for causing a plant to manufacture a product according to the following, the control station includes: an execution unit that executes the downloaded prescription program; a monitoring unit that monitors the execution status of the prescription program; and the monitoring unit executes the prescription program. When the completion of the prescription is detected, the operation monitoring station includes a request generation unit that generates a prescription setup request that specifies a prescription to be executed next, wherein the operation monitoring station stores a basic prescription program describing a prescription procedure, Request generation means generates prescription setup request Then, reading means for reading a basic prescription program corresponding to the prescription specified by the prescription setup request from the memory, prescription setup for the read basic prescription program, and prescription setup means for creating an execution prescription program, prescription storing means for downloading an executable formulation program created to the execution means, the
And a prescription setup request from the control station
Generated, the generated request is received by the operation monitoring station,
The operation monitoring station controls the prescription according to the request.
This is a plant control system that is downloaded to an application. In the control station of the present invention, when the monitoring means detects the completion of the execution of the prescription program, the request generation means generates a prescription setup request specifying the next prescription to be executed. In the operation monitoring station, when receiving the prescription setup request, the reading means reads a basic prescription program corresponding to the prescription specified by the prescription setup request from the memory. The prescription setup means performs a prescription setup for the read basic prescription program to create an execution prescription program. The prescription storage means downloads the created execution prescription program to the execution means. Thus, the operation monitoring station receives the request generated from the control station side, and the operation monitoring station downloads the prescription according to the request to the control station. Hereinafter, the present invention will be described with reference to the drawings. FIG. 1 is a configuration diagram showing one embodiment of the present invention.
In FIG. 1, ICS is an operation monitoring station, FCS is a control station, BS is a communication bus connecting the operation monitoring station ICS and the control station FCS, and PLT is a plant controlled by the control station FCS. Although only one control station FCS is shown in FIG. 1, a plurality of control stations FCS are actually distributed in the plant PLT. In the control station FCS, reference numeral 10 denotes execution means for executing the downloaded prescription program;
Is monitoring means for monitoring the execution status of the prescription program. Numeral 12 is a request generating means. When the monitoring means 11 detects the completion of the execution of the prescription program, it generates a prescription setup request specifying a prescription to be executed next. Reference numeral 13 denotes a communication means for exchanging data with the operation monitoring station ICS and other control stations via the communication bus BS in accordance with a predetermined communication protocol. An operation monitoring station ICS 20 is a memory storing a basic prescription program (basic prescription program). Numeral 21 denotes a reading means. When the request generating means 12 generates a prescription setup request, the basic prescription program specified by the request is read from the memory 20. A prescription setup means 22 performs prescription setup for the read basic prescription program to create an execution prescription program. 23 is a prescription storage means for downloading the created execution prescription program to the execution means 10. 24
Is communication means for transmitting and receiving data to and from the control station FCS via the communication bus BS in accordance with a certain communication protocol, and for transferring various data handled by each control station FCS in charge of the operation monitoring station ICS. It collects and transfers necessary data and commands from the operation monitoring station ICS side to the control station FCS side with the processing. In the plant PLT, SN is a sensor for detecting a process value such as temperature and pressure, and V1 and V2 are valves. In the plant control system configured as described above, the control station FCS uses the signals from the various sensors SN to control the valves V1, V2 based on the prescription to be executed.
By operating V2, the plant PLT is controlled. Various control information handled by each control station FCS includes a communication bus BS.
To the operation monitoring station ICS side, and the operation monitoring station ICS displays process control information, monitoring results, and the like on a display screen. Further, the operation monitoring station ICS transmits control information for operating and operating the plant to the control station FCS via the communication bus BS. Such an operation is an operation of a general distributed control system. FIG. 2 shows an example of a procedure for prescribing a prescription. The SFC (Sequential Function C)
hart). SFC is a visual language that can express the flow of a sequence as a flow diagram of steps and transitions. In the SFC of FIG.
“1” and “2” are step numbers, “initialize”, “reserve”
Is an action. “+” Is a transition.
A transition gives a transition condition when transitioning from one step to the next step. When executing an SFC, only one step in the SFC is active. The action is performed when the step becomes active. When the execution of the action ends, the transition becomes active, and the inspection of the transition condition starts. If the transition condition is satisfied, the next step becomes active. This operation is repeated, and the steps of the SFC are sequentially executed from the top. In the SFC of FIG. 2, after the prescription is reserved in step 2, the same prescription is repeatedly executed to proceed to the process “J01”. FIG. 2 shows an example in which the plant PLT is a batch plant that manufactures a wide variety of products by batch processing. The prescription to be executed is selected according to the brand of the product to be manufactured. In the example of FIG. 2, the basic prescription is reserved from the memory 20 in the programming language for controlling the batch process, and the execution prescription created from the basic prescription is repeatedly executed. In the “reservation” step of FIG. 2, “wait unt
“il (%%, BSTS == END)” means that the execution unit 10 waits until the execution of the prescription is completed. "Rp
reserve (1, RECIPE-1, batchI
[D, tran)], using the built-in function rpreserve, the prescription group name “1” and the basic prescription name “RECIPE”.
This means that the basic prescription specified by “−1” is reserved. "Wait unit (%%, BSTS == RU
“NNING)” means to wait until the execution of the reserved prescription starts. FIG. 3 is an SFC showing an example of a prescription executed by the execution means 10. The SFC in FIG. 3 shows a procedure for heating a raw material using a kettle. In Step 1, raw materials are charged into a kettle. In step 2, the kettle is heated to produce a product. The produced product is transferred to the product tank. In step 3, the kettle is washed. The product is made by following these steps. The procedure for reserving a prescription will be described. FIG. 4 is a flowchart showing a procedure for prescription reservation. The operation will be described according to the order of steps in the flowchart. (S1) Request generating means 12 on the control station FCS side
Generates a prescription setup request to the operation monitoring station ICS using the built-in function rpreserve. The basic prescription to be set up is described in the argument of the built-in function rpreserve. Built-in function r
The argument of the preserve is rprese in the example of FIG.
rve (1, RECIPE-1, batchID, tr
an), “1, RECIPE-1, batchID,
tran ”. (S2) Reading means 21 on the operation monitoring station ICS side
Reads out the basic prescription program according to the request from the memory 20. (S3) The prescription setup means 22 performs a prescription setup for the basic prescription program and creates an execution prescription program. (S4) The prescription storage means 23 downloads the created execution prescription program to the execution means 10. When the down mode loading of the prescription is the automatic mode and the start mode of the prescription is the automatic mode, the execution prescription is automatically downloaded after the reservation of the prescription, and the execution of the prescription is started. According to the present invention, the following effects can be obtained. Since the prescription is set up from the control station side, not from the operation monitoring station where the operator intervenes, automatic reservation and repeated reservation of the same batch processing can be performed. Further, since the prescription is set up without the intervention of an operator, the possibility of a setup error occurring is reduced. There is no need to build a special application program for prescription setup on the operation monitoring station, and the system can be made versatile.

[Brief description of the drawings] FIG. 1 is a configuration diagram showing one embodiment of the present invention. FIG. 2 is a diagram illustrating the operation of the present invention. FIG. 3 is an operation explanatory diagram of the present invention. FIG. 4 is a diagram illustrating the operation of the present invention. [Explanation of symbols] ICS operation monitoring station FCS control station BS communication bus 10 Execution means 11 Monitoring means 12 Request generation means 13, 24 Communication means 20 memories 21 Reading means 22 Prescription setup means 23 Prescription storage means

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields investigated (Int. Cl. ⁷ , DB name) G06F 1/00 G06F 13/00 G06F 9/445 G05B 15 / 02,23 / 02

Claims (1)

(57) [Claim 1] An operation monitoring station and a control station are connected to a communication bus, the operation monitoring station monitors and controls the plant, and the control station operates according to a set up recipe. In a plant control system for causing a product to be manufactured, the control station includes: an execution unit that executes a downloaded prescription program; a monitoring unit that monitors an execution status of the prescription program; and the monitoring unit completes execution of the prescription program. And a request generating means for generating a prescription setup request that specifies a prescription to be executed next, wherein the operation monitoring station includes: a memory storing a basic prescription program describing a procedure of prescription; When the instrument generates a prescription setup request, the prescription Read-out means for reading a basic prescription program corresponding to the prescription specified by the setup request from the memory; prescription setup means for performing a prescription setup for the read basic prescription program to create an execution prescription program; Prescription storage means for downloading a program to the execution means, and a prescription setup request from the control station side.
Occurs and the operation monitoring station receives the generated request.
The operation monitoring station controls the prescription according to the request.
A plant control system that is downloaded to a station.