CPU mainly by the operator, controller, register and data connections between them, control and status bus constituted, plc cpu modules CPU unit also includes a peripheral chip bus interface and related circuitry. The main memory used to store programs and data, communication modules plc is an indispensable component PLC unit.
In the user view,input module plc unnecessarily detailed analysis of the internal circuitry of the CPU, but each part is working mechanism should be enough to understand.
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