目前市场上的PLC产品众多，国外品牌有德国的SIEMENS;日本的 OMRON、MITSUBISHI、FUJI、Panasonic;美国的GE;韩国的LG等。国产品牌有研华、研祥、合力时等。近几年，PLC产品的价格有较大的下降，其性价比越来越高。PLC 的选型应从以下几个方面入手。
The GE Versamax IC200CHS101 is a disconnect-style interposing i/o terminal main bate. GE Versamax IC200CHS101 provides terminals that correspond to the "a" terminals on a Versamax i/o module. ge Versamax has a connector (j1) for attaching a cable from the connector-style i/o carrier and 36 box-style terminals for field i/o wiring and power connections.
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Hamamatsu R928-21 Photomultiplier Tube
Digi 50001077-01 Ports 16/em 232 CR2 RJ 120K
Sony Multiplexer YS-SX210
