Why need some outside the PLC terminals and the terminal to carry on the corresponding PLC -

so why also need some terminal row outside the PLC and PLC controller on the terminal to carry on the corresponding? I think there are so few reasons to, first of all it is PLC as a controller to receive external signals, such as all kinds of sensor signals, switches, etc. , these components are installed in various parts of the control equipment, these devices to connect with PLC must pass the external terminal row corresponding docking with PLC, because it is not only the connection process also need to in the system maintenance and troubleshooting of easily and set up some terminals, the terminal line identifies the various name is easy to find fault.

another aspect also is to make the PLC control system is more stable, increase the anti-interference ability of the PLC control system, because in the output terminal of the PLC have a plenty of its current high voltage control relay coil, such as some of the relay voltage is 220 v, current can reach 2 a, and the input terminal of PLC is usually low voltage input control signal of the electric current is small, such as sensor signals have a plenty of 0 ~ 20 ma current signal, if not through the external terminals with separate docking is easy to cause interference. And this is why the external outside to meet another one of the reasons why the relay terminal station.

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