6 Table of Contents WAGO I/O System 750 XTR
750-362/0040-0000 FC Modbus TCP G4 XTR
Manual
Version 1.1.0
10 Diagnostics ............................................................................................. 145
10.1 LED Signaling ...................................................................................... 145
10.1.1 Evaluating Fieldbus Status .............................................................. 146
10.1.2 Evaluating Node Status – I/O LED (Blink Code Table) ................... 147
10.2 Fault Behavior ...................................................................................... 157
10.2.1 Fieldbus Failure ............................................................................... 157
10.2.2 Local Bus Failure............................................................................. 157
11 Fieldbus Communication ....................................................................... 159
11.1 Implemented Protocols ........................................................................ 159
11.1.1 Communication Protocols ............................................................... 159
11.1.1.1 IP (Internet Protocol) .................................................................. 159
11.1.1.2 TCP (Transmission Control Protocol) ......................................... 164
11.1.1.3 UDP (User Datagram Protocol) .................................................. 164
11.1.2 Configuration and Diagnostics Protocols ........................................ 165
11.1.2.1 BootP (Bootstrap Protocol) ......................................................... 165
11.1.2.2 DHCP (Dynamic Host Configuration Protocol) ........................... 166
11.1.2.3 HTTP (Hypertext Transfer Protocol) ........................................... 168
11.1.2.4 DNS (Domain Name Systems) ................................................... 168
11.1.2.5 SNTP-Client (Simple Network Time Protocol) ............................ 169
11.1.2.6 FTP-Server (File Transfer Protocol) ........................................... 169
11.1.2.7 SNMP (Simple Network Management Protocol) ......................... 170
11.1.2.7.1 MIB II Description ................................................................... 171
11.1.2.7.2 Traps ...................................................................................... 172
11.1.3 Application Protocols ....................................................................... 173
11.2 Modbus Functions ................................................................................ 174
11.2.1 General ........................................................................................... 174
11.2.2 Use of the MODBUS Functions....................................................... 177
11.2.3 Description of the MODBUS Functions ........................................... 178
11.2.3.1 Function Code FC1 (Read Coils) ............................................... 179
11.2.3.2 Function Code FC2 (Read Discrete Inputs)................................ 181
11.2.3.3 Function Code FC3 (Read Multiple Registers) ........................... 183
11.2.3.4 Function Code FC4 (Read Input Registers) ............................... 184
11.2.3.5 Function Code FC5 (Write Coil) ................................................. 185
11.2.3.6 Function Code FC6 (Write Single Register) ............................... 186
11.2.3.7 Function Code FC11 (Get Comm Event Counter) ...................... 187
11.2.3.8 Function Code FC15 (Write Multiple Coils) ................................ 188
11.2.3.9 Function Code FC16 (Write Multiple Registers) ......................... 190
11.2.3.10 Function Code FC22 (Mask Write Register) ............................... 191
11.2.3.11 Function Code FC23 (Read/Write Multiple Registers)................ 192
11.2.4 MODBUS Register Mapping ........................................................... 194
11.2.5 Modbus Registers ............................................................................ 197
11.2.5.1 Accessing Register Values ......................................................... 198
11.2.5.2 Modbus-Watchdog ..................................................................... 198
11.2.5.3 Modbus Watchdog Register ........................................................ 200
11.2.5.4 Diagnostic Registers ................................................................... 204
11.2.5.5 Configuration Registers .............................................................. 205
11.2.5.6 Constant Registers ..................................................................... 207
11.2.5.7 Firmware Information Registers ................................................. 209
12 I/O Modules ............................................................................................. 214