Tag Archives: plc scan cycle diagram

What is the execution order of the PLC program?

PLC program execution order (1) The ladder diagram should be programmed with the left bus as the starting point and the right bus as the end point, from left to right, written line by line. The beginning of each line is the starting condition, consisting of normally open, normally closed contacts or a combination thereof. […]

The scan cycle of the PLC, what is the scan cycle of the PLC?

When the PLC is in the RUN mode, the time required to perform a scan operation is called the scan period, and its typical value is about 1 to 100 ms. The plc scan cycle has a lot to do with the length of the user program, the type of instructions, and the speed at […]