Profibus System Integration PDF 4.03MB - Schneider Electric

The function blocks represent the device’s functional organization and the method inwhich this device is handled by the PROFIBUS communication system.Physical and Transducer Block parameters are usually accessed duringcommissioning, or during a maintenance operation. For example, if we consider apressure transmitter, its Transducer Block parameters will be accessed to indicatewhether this sensor is used to measure pressure or level, whether and how themeasured value will be linearized, etc.Profibus Communication ProtocolProfibus is a master-slave protocol. A field device is configured as a slave that canonly respond to a command from a master.PROFIBUS DP protocols have been developed in a series of stages:• PROFIBUS DP (V0) protocol is a master-slave protocol primarily used to handledistributed I/O blocks or devices, called stations. Each slave station is cyclicallypolled by the master, which collects inputs, updates outputs and collects slavediagnostic information.• PROFIBUS DPV1 protocol is an enhancement to PROFIBUS-DP (V0). It supportsmultiple masters using token passing. Network access is divided into cyclicexchanges, which occur at a fixed repetition rate, and acyclic exchanges whichtake place, occasionally (for example, during configuration).• PROFIBUS DPV2 protocol is a PROFIBUS DP extension dedicated to motioncontrol, with additional functionalities such as direct slave to slave data transfervia "lateral communication" mechanism.19