PLC CPU configuration

CPU configuration CPU is the core plc cpu module, play a role in the nerve center of each PLC has at least one cpu modules plc, function according to the PLC system program which gives the user to receive and store programs and data, collected by way of scanning the field input device status or data sent and stored in the specified register, while the diagnostic power and PLC internal circuit operating status 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 corresponding control signals to command associated control circuitry. plc cpu modules 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. In the user view, unnecessarily detailed analysis of the internal circuitry of the CPU, but each part is working mechanism should be enough to understand.plc cpu controller controls the work, which it reads the instruction, the instruction interpretation and execution of instructions. However, the pace of work is controlled by the oscillation signal. Operator used for digital or logic operations, working under the command of the controller. Register to participate in operations, and store intermediate result of the operation, it is also working under the command of the controller.cpu module speed and memory capacity are important parameters for PLC, which determines the operating speed PLC, IO number and software capacity, etc., thereby limiting the size of the control....