Proline Promass 83E/F/O Modbus RS485 Operating Instructions
Proline Promass 83E/F/O Modbus RS485 Operating Instructions
Proline Promass 83E/F/O Modbus RS485 Operating Instructions
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Operation<strong>Proline</strong> <strong>Promass</strong> 83 <strong>Modbus</strong> <strong>RS485</strong>5.5 <strong>Modbus</strong> <strong>RS485</strong> communication5.5.1 <strong>Modbus</strong> <strong>RS485</strong> technologyThe <strong>Modbus</strong> is an open, standardized fieldbus system which is deployed in the areas ofmanufacturing automation, process automation and building automation.System architectureThe <strong>Modbus</strong> <strong>RS485</strong> is used to specify the functional characteristics of a serial fieldbus system withwhich distributed, digital automation systems are networked together.The <strong>Modbus</strong> <strong>RS485</strong> distinguishes between master and slave devices.• Master devicesMaster devices determine the data traffic on the fieldbus system. They can send data without anexternal request.• Slave devicesSlave devices, like this measuring device, are peripheral devices. They do not have their ownaccess rights to the data traffic of the fieldbus system and only send their data due to an externalrequest from a master.Fig. 30:<strong>Modbus</strong> <strong>RS485</strong> system architecture1 <strong>Modbus</strong> master (PLC, etc.)2 <strong>Modbus</strong> <strong>RS485</strong>3 <strong>Modbus</strong> slave (measuring devices, etc.)Page 42 • MN0M030Issue/Rev. 0.2 (12/12)
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