Device logic control method based on programmable logic controller (PLC)/distributed control system (DCS)

Abstract

Disclosed is a device logic control method based on a programmable logic controller (PLC) / distributed control system (DCS). The method includes the steps that (1) device information is collected; (2) on-site devices are classified, and a device class library is established; (3) a logic control principle diagram of each class of devices is designed, and a logic control principle diagram library is established; (4) a logic control module of each class of devices is developed on a selected PLC / DCS platform, and a logic control module library is established; (5) on-site device information is collected, and logic control over each on-site device can be finished respectively by the logic control module of each on-site device through calling of the logic control modules of device classes. By means of the device logic control method based on the PLC / DCS, program development is accelerated, the difficulty of device logic control, program development, program testing and on-site debugging is reduced, engineering experience accumulation is facilitated, the requirement for electric professional skills of program developers is lowered, and the number of participating professional staff is decreased.

Description

technical field [0001] The invention belongs to the technical field of electrical automation, and in particular relates to a PLC / DCS-based equipment logic control method. Background technique [0002] In the process industry, the logic control of the field equipment is realized by the equipment logic control program. The traditional modular programming method is to establish corresponding subroutine modules for each device, and then the main program calls each subroutine module according to the logical relationship of the process, so as to realize the logic control of the field devices. The above-mentioned traditional modular program design and development method can realize the sharing of system resources among subprogram modules, between the subprogram module and the main program module, and can realize the parameter calling and value passing processing of the subprogram, and the processing speed is fast. For a more complex process, the program structure is more complicat...

AI Technical Summary

Problems solved by technology

[0003] Modern technological processes are becoming more and more complex, involving more and more equipment, and the logical interlocking relationship between each equipment is also becoming more and more complex, which leads to large and medium-sized control systems (I / O points above 1024 ) device logic control program design and development, the workload of program design, development and maintenance is relatively large, the design and development cycle is relatively long, and there are many design and development personnel who need to participate; and due to the complexity of the software, when When on-site program debugging is required, only the participating programmers can be competent. If the project scale is relatively large, involves a lot of equipment, or the project implementation site is far away, the traditional modular method cannot meet the needs of the development of new process control systems, so , How to increase the speed of program design and development, reduce the number of people involved in design and development, thereby reducing project costs, and improving the maintainability of programs is a difficult problem faced by many automation companies at present

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