Modbus communication protocol is basically follow the Master and Slave communication procedure, one party to take proactive role to play Master asks way, sending Query Message to the Slave side, and then received by the Slave side based content preparation Query Message Response Message back to the Master. Even if the current hardware communication initiative can already achieve mutual communication abilities, but the provisions of the Modbus communication protocol must be one of the Master, the other as Slave can not swap roles. General use, the monitoring system (HMI) are Master, PLC, meter, meters so as Slave, HMI systems have been Polling Slave various elay and register the latest values, and then do the show, and various logic calculation and control adjustments, etc. Managers.

自控界主流通信規約 Modbus 詳解.pdf

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