Introduction - If you have any usage issues, please Google them yourself
The central processing unit (CPU) is the control center of the PLC, which is in accordance with the function of PLC system program to receive and store the type in the user program and data from the programmer, check the power supply, memory I/O and warn the timer state;And diagnose the grammatical errors in the user program.When PLC in operation, the first it receives in the form of scanning field state of each input device and data, and deposited in the I/O image area respectively, and then passes from the user program memory read the user program