Fieldbus Coupler • 51Fieldbus Coupler 750-346WAGO-I/O-SYSTEM 750DeviceNet3.1.5.1 Communication InterfacesFor a data exchange, the DeviceNet fieldbus coupler is equipped with two inter-faces:• the interface to fieldbus (-master) and• the interface to the bus modules.Data exchange takes place between the fieldbus master and the bus modules.Access from the fieldbus side is fieldbus specific.3.1.5.2 Memory AreasThe coupler uses a memory space of 32 bytes for the physical input and 32bytes for the physical output data.I O12memory areafor input data I/O modulesinputmodulesoutputmodulesmemory areafor output datafieldbus couplerfieldbusFig. 3-9: Memory areas and data exchange for a fieldbus coupler g012447eThe coupler process image contains the physical data of the bus modules in astorage area for input data and in a storage area for output data (32 bytes each).1 The input module data can be read from the fieldbus side.2 In the same manner, writing to the output modules is possible from thefieldbus side.
