In the relay control system, to complete a control task, various input devices (buttons, control switches, limit switches, sensors, etc.) and several intermediate relays, time relays, count relays, etc, must be composed of wires and have certain logic. The control circuit is connected, and then through the output device (contact network, solenoid valve and other actuators) to control the action or operation of the controlled object, this control system is called the wiring control system, the logic realized is called the wiring logic, ie the input pair The output control is achieved through the "wiring program".

In such a control system, changes or modifications of the control requirements must be accomplished by changing the hard-wired control circuit. Therefore, although its structure is simple and easy to understand, it has been widely used in the field of industrial control for a long period of time. However, due to its large size, slow operation speed, single function, complicated wiring, and poor versatility and flexibility, it has become increasingly incapable of satisfying production in modern production. Complex and varied control requirements for processes and processes.

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