Fieldbus coupler /controller • 47Fieldbus controller 750-842Modular I/O SystemETHERNET TCP/IP3.2 Fieldbus controller 750-842This chapter includes:3.2.1 Description ..................................................................................... 483.2.2 Hardware ........................................................................................ 491.1.1.1 View......................................................................................... 491.1.1.2 Device supply .......................................................................... 501.1.1.3 Fieldbus connection ................................................................. 511.1.1.4 Display elements...................................................................... 511.1.1.5 Configuration and programming interface............................... 521.1.1.6 Operating mode switch ............................................................ 521.1.1.7 Hardware address (MAC-ID) .................................................. 533.2.3 Operating system ............................................................................ 541.1.1.8 Start-up .................................................................................... 541.1.1.9 PLC cycle................................................................................. 543.2.4 Process image ................................................................................. 561.1.1.10 Example of a process input image ........................................... 571.1.1.11 Example of a process output image ......................................... 581.1.1.12 Process data architecture for MODBUS/TCP ......................... 593.2.5 Data exchange................................................................................. 651.1.1.13 Memory areas .......................................................................... 661.1.1.14 Addressing ............................................................................... 671.1.1.15 Data exchange between master and I/O modules .................... 701.1.1.16 Data exchange between PLC functionality (CPU) and I/Omodules.................................................................................... 711.1.1.1 Data exchange between master and PLC functionality (CPU) 721.1.1.17 Common access of MODBUS master and PLC functionality tooutputs ..................................................................................... 733.2.6 Starting up ETHERNET TCP/IP fieldbus nodes............................ 751.1.1.18 Note the MAC-ID and establish the fieldbus node.................. 751.1.1.19 Connecting PC and fieldbus node............................................ 751.1.1.20 Determining IP addresses ........................................................ 761.1.1.21 Allocating the IP address to the fieldbus node ........................ 761.1.1.22 Testing the function of the fieldbus node ................................ 791.1.1.23 Viewing the HTML pages ....................................................... 803.2.7 Programming the PFC with WAGO-I/O-PRO 32 .......................... 821.1.1.24 WAGO-I/O-PRO 32 library elements for ETHERNET .......... 821.1.1.25 IEC 61131-3-Program transfer ................................................ 843.2.8 LED Display ................................................................................... 871.1.1.26 Blink code................................................................................ 871.1.1.27 Fieldbus status ......................................................................... 881.1.1.28 Node status............................................................................... 881.1.1.29 Fault message via blink code from the I/O-LED ..................... 901.1.1.30 Supply voltage status ............................................................... 913.2.9 Fault behavior................................................................................. 921.1.1.31 Fieldbus failure ........................................................................ 921.1.1.32 Internal bus fault ...................................................................... 923.2.10 Technical Data................................................................................ 93