MODBUS protocol is opening communication protocol provided by MODICON and widely used in the industrial control region.
MODBUS协议是MODICON公司推出的一个开放式通信协议，广泛运用于工业控制领域。
When the chemical desalting water system adds activated carbon filter, control functions of old MODICON PLC system needs to be extended.
化学除盐水系统增加活性炭过滤器，需要在原有MODICON PLC程控系统上进行控制功能扩展。
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