input module plc simple classification

PLC switch input and output modules can be roughly divided into two types:
One is connected to the host using the flat line, there is a cable

connected to the host using communications.
The latter is actually a complete switching measurement and control

modules, communication cables used to plc analog output module  obtain input switch status and

control commands issued by the control switch output. Contains an internal

microprocessor to achieve more complex, if you are familiar with the

microcontroller, you can try.
The former is relatively simple, its measurement and  lc soe module control are actually

done in the host, input and output modules essentially completed only two

things:
1, the input switch signal conditioning
Switch conditioning is the easiest conditioning circuitry, easy to

implement.
2, the output switch driver
Switch output driver is basically relay driver  plc programmable circuit, but also easy to

implement.
PLC is now mainly used mostly imported, not the actual complexity and

digital input and output modules are relatively simple modules, encourage

yourself or with a domestic brand!