I/O Modules • 199Process Data Architecture for EtherNet/IPWAGO-I/O-SYSTEM 750ETHERNET TCP/IP5.3.5 Specialty ModulesWAGO has a host of Specialty I/O modules that perform various functions.With individual modules beside the data bytes also the control/status byte ismapped in the process image. The control/status byte is required for the bi-directional data exchange of the module with the higher-ranking controlsystem. The control byte is transmitted from the control system to the moduleand the status byte from the module to the control system.This allows, for example, setting of a counter with the control byte ordisplaying of overshooting or undershooting of the range with the status byte.Further informationFor detailed information about the structure of a particular module’scontrol/status byte, please refer to that module’s manual. Manuals foreach module can be found on the Internet under:http://www.wago.com.The Specialty Modules represent as analog modules.For this, the process input data of the Specialty Modules seize one Instanceper channel in the Analog Input Point Object (Class 0x67) and the processoutput data seize one Instance seize one Instance in the Analog Input PointObject (Class 0x67) per channel in the Analog Output Point Object (Class0x68).Counter Modules750-404, (and all variations except of /000-005),753-404, (and variation /000-003)The above Counter Modules have a total of 5 bytes of user data in both theInput and Output Process Image (4 bytes of counter data and 1 byte ofcontrol/status). The counter value is supplied as 32 bits. The following tablesillustrate the Input and Output Process Image, which has a total of 3 wordsmapped into each image. Word alignment is applied.Input Process ImageByte DestinationOffset High Byte Low Byte Remark0 - S Status byte1 D1 D02 D3 D2 Counter ValueThe specialty modules represent 1x6 bytes input data and seize 1 Instance inClass (0x67).
