The document introduces the Omron CQM1H programmable logic controller (PLC) training kit. It discusses that the PLC system consists of three modules: a power supply module, control module, and output modules. The control module, an Omron CPU 21 unit, processes input signals and produces output signals. It can control 16 inputs and 16 outputs. PLCs are commonly used in manufacturing automation due to advantages like consistency, control over processes, improved accuracy and productivity.