196 • Process Data Architecture for EtherNet/IPAnalog Input ModulesWAGO-I/O-SYSTEM 750ETHERNET TCP/IPInput Process ImageBit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0Diagnostic bit S 7Channel8Diagnostic bit S 6Channel7Diagnostic bit S 5Channel6Diagnostic bit S 4Channel5Diagnostic bit S 3Channel4Diagnostic bit S 2Channel3Diagnostic bit S 1Channel2Diagnostic bit S 0Channel1Diagnostic bit S = '0' no ErrorDiagnostic bit S = '1' overload, short circuit, or broken wireThe output modules seize 8 Instances in Class (0x65).Output Process ImageBit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0controlsDO 8Channel8controlsDO 7Channel7controlsDO 6Channel6controlsDO 5Channel5controlsDO 4Channel4controlsDO 3Channel3controlsDO 2Channel2controlsDO 1Channel1And the output modules seize 8 Instances in Class (0x66).5.3.3 Analog Input ModulesThe hardware of an analog input module has 16 bits of measured analog dataper channel and 8 bits of control/status. However, the coupler/controller withEtherNet/IP does not have access to the 8 control/status bits. Therefore, thecoupler/controller with EtherNet/IP can only access the 16 bits of analog dataper channel, which are grouped as words and mapped in Intel format in theInput Process Image.When digital input modules are also present in the node, the analog input datais always mapped into the Input Process Image in front of the digital data.Each input channel seizes one Instance in the Analog Input Point Object(Class 0x67).1 Channel Analog Input Module750-491, (and all variations)Input Process ImageByte DestinationOffset High Byte Low Byte Remark0 D1 D0 Measured Value U D1 D3 D2 Measured Value U refThe input modules represent 2x2 bytes and seize 2 Instances in Class (0x67).
