The programming of plc is a process of describing the control tasks in a programming language. The methods commonly used in PLC programming are empirical design methods and sequential function diagrams. This chapter describes the control program for designing PLCs using empirical design methods and sequential function diagrams.
The empirical design method actually continues the traditional relay electrical schematic design method. On the basis of some typical control unit circuits, according to the specific requirements of the controlled object to the control system, many auxiliary relays are used to complete the memory and interlock. , interlocking and other functions. Programs designed with this design method must undergo repeated modifications and improvements to meet the requirements. This design method has no rules to follow, has great exploratory and random nature, and the debugging time of the program is long. The programmed program varies from person to person and is not standardized, which will bring inconvenience to the use and maintenance, especially to the control system. Improvement brings a lot of difficulties. Experience design methods are generally only applicable to simple ladder diagram designs, and require designers to have a wealth of design experience, familiar with many basic control unit and control system examples.
The empirical design method to design the control program is as follows:
(1) Understand the controlled equipment and process, analyze the requirements of the control system, and select the control plan;
(2) Determine the master component, the detection component, and the auxiliary relay according to the process requirements of the controlled system;
(3) Using the input signal to design the start, stop and self-protection functions;
(4) use auxiliary components, timers and counters;
(5) using function instructions;
(6) adding interlocking conditions and protection conditions;
(7) Check, modify and improve the procedures.
The method of the function diagram design program (sequential control design method) is only applicable to the sequential control system. The method of sequential control function diagram design program is easy to be accepted by beginners. The designed program is standardized, intuitive, easy to read, and easy to modify and debug. The FX series PLC has set up step-by-step instruction programming for the function diagram program design, making the function diagram design program easier.
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