IO module is a device connecting a programmable logic controller (PLC) to other devices, particularly field devices.
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Small PLCs have a fixed number of connections built in for inputs and outputs. Typically, expansions are available in the base model has insufficient I/O.
Modular PLCs have a chassis (also called an I/O rack) into which are placed modules with different functions.
Meanwhile, The processor and selection of I/O modules are customized for the particular application. special processes need to work permanently with minimum unwanted downtime. Therefore, it is necessary to design a system which is fault-tolerant and capable of handling the process with faulty modules.