Typically, the master is a human machine interface (HMI) or Supervisory Control and Data Acquisition (SCADA) system and the slave is a sensor, programmable logic controller (PLC), or programmable automation controller (PAC). In a master-slave relationship, communication always occurs in pairs-one device must initiate a request and then wait for a response-and the initiating device (the master) is responsible for initiating every interaction. ![]() ![]() Modbus is a request-response protocol implemented using a master-slave relationship.
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