Rexroth Tightening System 350 System Documentation - Rhino ...

7 Data Services Tightening Technology | Bosch Rexroth AG 163/3167.6 DeviceNet communication7.6.1 DeviceNet fundamentals7.6.1.1 Protocol descriptionTransfer of data and control signals in a master/slave process is possible using the DeviceNet networktechnology, which is based on the CAN bus standard. Data exchange between the tightening system andthe partner controllers takes place physically via a shielded cable with separate wire pairs for the powersupply and the data. To do this, an IMdev interface module is inserted in slot A of the Compact System.The layers of the OSI layer model are assigned as follows in DeviceNet:Layer 7Layer 6Layer 5Layer 4Application layerInterface to the application program with application-orientedcommands (read, write).Display layerSession layerTransport layerbased on CIP(Common Industrial Protocol)Layer 3Layer 2Network layerBackup layerDescription of the bus access method. Start and end charactersare added, the transfer could possibly be repeated ifthere is a failure.based on CAN bus(Controller Area Network)Layer 1Bit transfer layerSets physical transfer of data bytesSeparate wire pairs fordata and power supplyFigure 7–54:OSI layer model for DeviceNetA slave with a data buffer for data communication is implemented in the IMdev interface module, i.e. thepartner controller, or master, writes the data in the input area and reads the data from the output area ofthe data buffer. The Tightening System 350 provides the data (control signals) accordingly in the outputarea of the data buffer or takes over the data from the input area (control signals and ID code). The timefor the data exchange is stipulated by the master.System 350 | 3 608 878 040/05.2008