Contents MVI56E-MNETC/MNETCXT ♦ ControlLogix™ Platform
User Manual Modbus TCP/IP Client Enhanced Communication Module - Client/Server
Page 6 of 162 ProSoft Technology, Inc.
4 Diagnostics and Troubleshooting 75
4.1 Ethernet LED Indicators ................................................................................... 75
4.1.1 Scrolling LED Status Indicators ....................................................................... 76
4.1.2 Non-Scrolling LED Status Indicators ............................................................... 77
4.2 Clearing a Fault Condition ............................................................................... 77
4.3 Troubleshooting the LEDs ............................................................................... 78
4.4 Using the Diagnostics Menu in ProSoft Configuration Builder ........................ 79
4.4.1 The Diagnostics Menu ..................................................................................... 82
4.4.2 Monitoring Module Information ........................................................................ 83
4.4.3 Monitoring Backplane Information ................................................................... 84
4.4.4 Monitoring Database Information..................................................................... 84
4.4.5 Monitoring MNETC Server Information ........................................................... 85
4.4.6 Monitoring MNET Client Information................................................................ 86
4.5 Reading Status Data from the Module ............................................................ 87
4.5.1 Status Data Definition ...................................................................................... 87
4.5.2 Configuration Error Word ................................................................................. 90
4.5.3 Client Command Errors ................................................................................... 91
4.6 Connecting to the Module's Webpage ............................................................. 93
5 Reference 94
5.1 Product Specifications ..................................................................................... 94
5.1.1 General Specifications ..................................................................................... 94
5.1.2 Functional Specifications ................................................................................. 95
5.1.3 Hardware Specifications .................................................................................. 96
5.2 Functional Overview ........................................................................................ 96
5.2.1 Backplane Data Transfer ................................................................................. 96
5.2.2 Normal Data Transfer Blocks ........................................................................... 99
5.2.3 Special Function Blocks ................................................................................. 103
5.2.4 Data Flow between MVI56E-MNETC/MNETCXT Module and Processor .... 122
5.3 Ethernet Cable Specifications ........................................................................ 126
5.3.1 Ethernet Cable Configuration ........................................................................ 126
5.3.2 Ethernet Performance .................................................................................... 127
5.4 Modbus Protocol Specification ...................................................................... 127
5.4.1 About the Modbus Protocol ........................................................................... 127
5.4.2 Read Coil Status (Function Code 01) ............................................................ 128
5.4.3 Read Input Status (Function Code 02) .......................................................... 130
5.4.4 Read Holding Registers (Function Code 03) ................................................. 131
5.4.5 Read Input Registers (Function Code 04) ..................................................... 132
5.4.6 Force Single Coil (Function Code 05) ........................................................... 133
5.4.7 Preset Single Register (Function Code 06) ................................................... 134
5.4.8 Read Exception Status (Function Code 07) .................................................. 134
5.4.9 Diagnostics (Function Code 08) .................................................................... 135
5.4.10 Force Multiple Coils (Function Code 15) ....................................................... 137
5.4.11 Preset Multiple Registers (Function Code 16) ............................................... 138
5.4.12 Modbus Exception Responses ...................................................................... 139
5.5 Using the Optional Add-On Instruction .......................................................... 141
5.5.1 Before You Begin ........................................................................................... 141
5.5.2 Overview ........................................................................................................ 141
5.5.3 Importing the Optional Add-On Instruction .................................................... 142
5.5.4 Reading the Ethernet Settings from the Module............................................ 147
5.5.5 Writing the Ethernet Settings to the Module .................................................. 148
5.5.6 Reading the Clock Value from the Module .................................................... 149
5.5.7 Writing the Clock Value to the Module .......................................................... 150