Contents MVI56E-MNETC/MNETCXT ♦ ControlLogix Platform
User Manual Modbus TCP/IP Client Enhanced Communication Module - Client/Server
Page 6 of 172 ProSoft Technology, Inc.
September 20, 2018
4 Diagnostics and Troubleshooting 81
4.1 Ethernet LED Indicators .......................................................................................... 81
4.1.1 Scrolling LED Status Indicators .............................................................................. 82
4.1.2 Non-Scrolling LED Status Indicators ...................................................................... 83
4.2 Clearing a Fault Condition ...................................................................................... 83
4.3 Troubleshooting the LEDs ...................................................................................... 84
4.4 Using the Diagnostics Menu in ProSoft Configuration Builder ............................... 85
4.4.1 The Diagnostics Menu ............................................................................................ 88
4.4.2 Monitoring Module Information ............................................................................... 89
4.4.3 Monitoring Backplane Information .......................................................................... 90
4.4.4 Monitoring Database Information............................................................................ 90
4.4.5 Monitoring MNETC Server Information .................................................................. 91
4.4.6 Monitoring MNET Client Information....................................................................... 92
4.5 Reading Status Data from the Module ................................................................... 92
4.5.1 Status Data Definition ............................................................................................. 93
4.5.2 Configuration Error Word ........................................................................................ 96
4.5.3 Client Command Errors .......................................................................................... 96
4.6 Connecting to the Module's Web Page .................................................................. 98
5 Reference 101
5.1 Product Specifications .......................................................................................... 101
5.1.1 General Specifications .......................................................................................... 101
5.1.2 Functional Specifications ...................................................................................... 102
5.1.3 Hardware Specifications ....................................................................................... 102
5.2 Functional Overview ............................................................................................. 103
5.2.1 Backplane Data Transfer ...................................................................................... 103
5.2.2 Normal Data Transfer Blocks ................................................................................ 106
5.2.3 Special Function Blocks ........................................................................................ 110
5.2.4 Data Flow between MVI56E-MNETC/MNETCXT Module and Processor ........... 129
5.3 Ethernet Cable Specifications ............................................................................... 134
5.3.1 Ethernet Cable Configuration ............................................................................... 134
5.3.2 Ethernet Performance ........................................................................................... 134
5.4 Modbus Protocol Specification ............................................................................. 135
5.4.1 About the Modbus Protocol .................................................................................. 135
5.4.2 Read Coil Status (Function Code 01) ................................................................... 136
5.4.3 Read Input Status (Function Code 02) ................................................................. 137
5.4.4 Read Holding Registers (Function Code 03) ........................................................ 138
5.4.5 Read Input Registers (Function Code 04) ............................................................ 139
5.4.6 Force Single Coil (Function Code 05) .................................................................. 140
5.4.7 Preset Single Register (Function Code 06) .......................................................... 141
5.4.8 Read Exception Status (Function Code 07) ......................................................... 142
5.4.9 Diagnostics (Function Code 08) ........................................................................... 142
5.4.10 Force Multiple Coils (Function Code 15) .............................................................. 144
5.4.11 Preset Multiple Registers (Function Code 16) ...................................................... 145
5.4.12 Modbus Exception Responses ............................................................................. 145
5.5 Using the Optional Add-On Instruction ................................................................. 148
5.5.1 Before You Begin .................................................................................................. 148
5.5.2 Overview ............................................................................................................... 148
5.5.3 Importing the Optional Add-On Instruction ........................................................... 150
5.5.4 Reading the Ethernet Settings from the Module................................................... 154
5.5.5 Writing the Ethernet Settings to the Module ......................................................... 156
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