Mitsubishi PLC logic quantity control program design - Database & Sql Blog Articles

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Control is the function of adding the desired changes to the state and behavior of the system. If this role and system state are expressed, and the logic quantity is used, then this control is the logic quantity control. It is the most commonly used control, and controlling it is the advantage of plc, and it is also the most basic application of PLC.

The purpose of the logic quantity control is to make the PLC generate the corresponding logic quantity output according to the current input combination of the logic quantity and the history input order, so that the system can work in a certain order, so sometimes it is called sequential control.

The PLC's sequential control of the system is manual, semi-automatic or automatic. The control principles adopted are scattered, concentrated and mixed. The logic problem of PLC has bit logic and word logic. These problems have two types of combination logic and timing logic.

In addition, if the PLC ladder diagram is understood as a circuit, if the input is determined by determinism, there are two types of determination circuits and random circuits. It is determined that the working order of the circuit is determined. The order of work of random circuits is branched, working along different branches depending on the input.