A PLC system comprises of Input and Output modules that allow information to be monitored and to be controlled.

Typical Input and Output modules for any PLC control system are:
- Digital Inputs
- Digital Outputs
- Analog Inputs
- Analog Outputs
There are also many specialty modules available for the more expensive systems such as:
- High speed input modules
- HART interface modules
- Hydraulic control modules
- Controlnet Interface modules
- Devicenet Interface modules
Unified Theory, Inc.
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