Abstract: In this paper, first of all, in view of the electrical control and PLC has carried on the simple analysis, points out that the application of PLC in automatic electric control should be based on the electrical control circuit, electrical control circuit into PLC logic instruction, in order to realize the automation of PLC electrical control, still further to explore the function of PLC can realize the automatic control and PLC in the automatic electric control concrete implementation approach, and based on a specific automatic electric control system based on PLC case to analyze the specific applications and reliability of the PLC, only supplies the reference.

Key words: Electrical control, PLC, Automatic electrical control