The working mode of PLC controller system

The internal working mode of PLC generally adopts a cyclic scanning working mode, and interrupt working mode has been added in some large and medium-sized PLCs. After the user completes the debugging of the user program, the program is written into the PLC memory through a programmer. At the same time, the input signals on site and the controlled execution components are connected to the input end of the input module and the output end of the output module. Then, the PLC working mode is selected as the running working mode, and the subsequent work is completed by the PLC according to the user program. The overview diagram is the PLC execution process diagram. During the working process, PLC mainly completes the processing of six modules.