iv • Table of ContentsWAGO-I/O-SYSTEM 750ETHERNET TCP/IP2.8.1.2 Insulated Assembly....................................................................... 362.8.2 Grounding Function........................................................................... 372.8.3 Grounding Protection ........................................................................ 382.9 Shielding (Screening) ............................................................................. 392.9.1 General............................................................................................... 392.9.2 Bus Conductors.................................................................................. 392.9.3 Signal Conductors.............................................................................. 392.9.4 WAGO Shield (Screen) Connecting System..................................... 402.10 Assembly Guidelines/Standards............................................................. 403 Fieldbus Coupler ....................................................................................... 413.1 Fieldbus Coupler 750-341 ...................................................................... 413.1.1 Description......................................................................................... 413.1.2 Hardware............................................................................................ 423.1.2.1 View .............................................................................................. 423.1.2.2 Device supply................................................................................ 433.1.2.3 Fieldbus connection ...................................................................... 433.1.2.4 Display Elements .......................................................................... 443.1.2.5 Configuration interface ................................................................. 443.1.2.6 Hardware address (MAC-ID) ....................................................... 453.1.3 Operating system ............................................................................... 453.1.4 Process image .................................................................................... 463.1.4.1 Example of a Process Input Image................................................ 483.1.4.2 Example of a Process Output Image ............................................. 493.1.4.3 Process Data Architecture............................................................. 503.1.5 Data Exchange ................................................................................... 503.1.5.1 Memory areas................................................................................ 513.1.5.2 Addressing the I/O modules.......................................................... 523.1.5.3 Data exchange between MODBUS/TCP master and I/O modules523.1.5.4 Data Exchange between EtherNet/IP Master and I/O Modules ... 543.1.6 Starting up a Fieldbus Node .............................................................. 553.1.6.1 Note the MAC-ID and establish the fieldbus node....................... 553.1.6.2 Connecting PC and fieldbus node................................................. 563.1.6.3 Determining IP addresses ............................................................. 563.1.6.4 Allocating the IP address to the fieldbus node ............................. 573.1.6.5 Testing the function of the fieldbus node ..................................... 603.1.6.6 Deactivating the BootP Protocol................................................... 603.1.7 Information on the Web-Based Management System ....................... 633.1.8 Configuration of SNMP..................................................................... 673.1.8.1 Description of MIB II ................................................................... 673.1.8.1.1 System Group................................................................................ 683.1.8.1.2 Interface Group ............................................................................. 683.1.8.1.3 Address Translation Group ........................................................... 703.1.8.1.4 IP Group........................................................................................ 703.1.8.1.5 IpRoute Table................................................................................ 723.1.8.1.6 IpNetToMediaTable...................................................................... 723.1.8.1.7 ICMP Group.................................................................................. 733.1.8.1.8 TCP Group .................................................................................... 743.1.8.1.9 UDP Group ................................................................................... 74