input and output modules of PLC

The analog module is called a Continuous Module. Usually, the voltage or current is given to the input module in the form of an analog signal. For the analog input module, 12-bit or 13-bit signal is used.

The digital module is also called Discrete Module.

In this module, the I/O signal work on the binary system i.e. only 0 or 1 value. For the digital input module, only the 1-bit signal is used.