CPU constitution

CPU is the core of the plc cpu, functions as the nerve center, each PLC have at least one plc modules, which functions according to the program given to the PLC system to receive and store user programs and data, by way of scanning the input collected by the field device sent state or data, and stored in the specified register, while the diagnostic power and internal circuit PLC working condition and programming syntax errors. After entering the run, one by one to read the instructions from the user program memory, then the task was analyzed by Directive generate appropriate control signals to command associated control circuitry