WAGO I/O System 750 Series Manual

Also see for I/O System 750 Series: Manual Manual Manual Manual

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I/O Modules • 105WAGO-I/O-SYSTEM 750DeviceNet5.2 Process Data Architecture for DeviceNetWith some I/O modules, the structure of the process data is fieldbus specific.In the case of a DeviceNet coupler/controller, the process image uses a bytestructure (without word alignment). The internal mapping method for datagreater than one byte conforms to the Intel format.The following section describes the process image for variousWAGO-I/O-SYSTEM 750 and 753 I/O modules when using a DeviceNet cou-pler/controller.NoteDepending on the specific position of an I/O module in the fieldbus node,the process data of all previous byte or bit-oriented modules must betaken into account to determine its location in the process data map.For the PFC process image of the programmable fieldbus controller is thestructure of the process data mapping identical.5.2.1 Digital Input ModulesDigital input modules supply one bit of data per channel to specify the signalstate for the corresponding channel. These bits are mapped into the InputProcess Image.When analog input modules are also present in the node, the digital data is al-ways appended after the analog data in the Input Process Image, grouped intobytes.Some digital modules have an additional diagnostic bit per channel in the In-put Process Image. The diagnostic bit is used for detecting faults that occur(e.g., wire breaks and/or short circuits).Each input channel seizes one Instance in the Discrete Input Point Object(Class 0x65).1 Channel Digital Input Module with Diagnostics750-435Input Process ImageBit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0Diagnostic bitS 1Data bitDI 1The input modules seize 2 Instances in Class (0x65).