Distinguish the characteristics of PLC and relay contact controller

1, PLC is the abbreviation of programmable controller. PLC is a very powerful intelligent industrial equipment controller. The control function of various applications can be realized by programming or ladder diagram.

2. Relays or contactors are electrical components that directly control on-off and realize different control functions through different wiring.

3.PLC is used in complex control occasions, and the complexity of its function has nothing to do with the number of wires. With the complexity of realized functions, the control of relays and contactors is also more complicated. The application function of PLC is realized by software programming, and the control function of relay is realized by wiring circuit.

4. So simple control can be realized by relays and contactors, which can be used by general electricians. Complex control can be realized by PLC, which needs professional and technical personnel.

5. There is also a common situation that the output circuit or contact of PLC cannot drive a large load. When driving a large load, it is necessary to add an intermediate relay or contactor at the output of PLC to improve the driving ability of the output.

6. By the way, introduce a new controller-timing program controller, which has basic functions similar to PLC, but it doesn't need programming or ladder diagram. Instead, the function setting is realized by table setting, so that people who are not familiar with programming can realize more complex equipment control functions. The models of controllers are TPC4-4TD, TPC8-8TD, TPC8- 16TD, etc. It can realize automatic control of 4-way, 8-way or 16-way loads, and is especially suitable for equipment control of cylinder solenoid valves. Simple wiring and convenient use.