PLC CPU configuration

 CPU is the core of the PLC, acts as the nerve center of each PLC have at least one CPU, which functions according to the program given to the PLC system to receive and store user programs and data collected by way of scanning the input device sent by the field state or data, and stored in the specified register, while the diagnostic power and the cpu module plc internal circuit operating status and programming syntax errors. After entering the run,plc cpu one by one to read the instructions from the user program memory, then the task was analyzed by Directive generate corresponding control signals to command associated control circuitry. PLC CPU mainly by the operator, controller, register and data connections between them, control and status bus constituted, CPU unit also includes a peripheral chip bus interface and related circuitry. The main memory used to store programs and data, is an indispensable component PLC unit.