用单片机实现对变频器的网络控制

The realization of network control to frequence－ changer with single chip microcomputer

针对采用外部控制模式的多变频器控制系统布线复杂、调节频率不方便易产生误动作或动作不到位的情况，介绍了一种变频器网络控制系统，用 AT89C51单片机通过 RS－ 485接口实现了对变频器的网络控制。

Frequence－ changer controled by external relay is in low stability with complex wiring and incommodious speed regulation or unreliable action.This article introduces a network control system of frequence－ changers,which is realized by AT89C51 Single Chip Microcomputer in communication way through RS－ 485 interface.