Contrast - PLC and relay control system Industrial control -

Relay control way is to use hardware connection, using the mechanical relays in series or in parallel, and the lagging of the time delay relay action combination control logic, it can only finish the logic control.

relay control depending on the contact mechanical movement control, low working frequency, millisecond, mechanical contact with dithering phenomenon.

PLC control semiconductor by a program instruction control, speed, microsecond, strict synchronization, no jitter.

relay control system lag time delay control, by the time relay and time relay timing accuracy is not high, affected by the environment, adjust the time difficult.

PLC with semiconductor integrated circuit timer, clock pulse generated by crystal oscillator, high precision, convenient adjustment time, is not affected by the environment.

PLC ladder diagram program generally USES the sequential control design method, this method of programming is very regular. Easy to grasp. For complex control system, the design of ladder diagram for a lot less than design circuit diagrams of relay system.

PLC user program can be simulated in the laboratory debugging, the input signal with a small switch to simulate, through the leds on the PLC controller can observe the state of the output signal. After completed the system installation and wiring, found in the field in the process of tracking problems usually by modify the program can be solved. The system debugging are much less time than the relay system.

PLC failure rate is low, and have perfect leds or programmer provide address quickly identify the cause of the failure, use the method of replacement modules can troubleshoot quickly.

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