描述
它只需在PLC主机上安装一块RS-485通讯板或挂接一块RS-485通讯模块；在PLC的面板下嵌入一块造价仅仅数百元的“功能扩展存储盒”，编写4条极其简单的PLC梯形图指令，即可实现8台变频器参数的读取、写入、各种运行的监视和控制，通讯距离可达50m或500m。
MGM 400 KVA 208 480Y/277 VAC AC370-T0133 TRANSFORMER
McGRAW-EDISON 15.5 KV VWE AUTOMATIC RECLOSER 5211
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UNUSED CUTLER-HAMMER HLD3600T107 600A CIRCUIT BREAKER
WESTINGHOUSE PB32500 2500A 600VAC FRAME CIRCUIT BREAKER
