Abstract
the programmable logic controller (PLC) is the control device which is the most commonly used in the industrial control system. It's popular among the control system designer and maintaining staff on account of its good reliability, anti-jamming and practical application. This paper studies the PLC control technology application in motor VVVF system, firstly we introduce the basic working principle and features of the PLC, then supply some technical guidance for the PLC control technology applications combined with DC motors and AC induction motors in PLC control system.
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