6reference – ProSoft Technology MVI56E-MCM/MCMXT User Manual
Page 115

MVI56E-MCM ♦ ControlLogix Platform
Reference
Modbus Communication Module
User Manual
ProSoft Technology, Inc.
Page 115 of 199
June 18, 2014
6
Reference
In This Chapter
Product Specifications ......................................................................... 115
Functional Overview ............................................................................ 118
Cable Connections .............................................................................. 138
MVI56E-MCM Database Definition ...................................................... 143
MVI56E-MCM Configuration Data ....................................................... 144
MVI56E-MCM Status Data Definition .................................................. 152
MVI56E-MCM User Defined Data Types ............................................. 154
Modbus Protocol Specification ............................................................ 160
Using the Optional Add-On Instruction ................................................ 172
Using the Sample Program - RSLogix 5000 Version 15 and earlier .... 180
6.1
Product Specifications
The MVI56E Enhanced Modbus Master/Slave Communication Modules allow
Rockwell Automation
®
ControlLogix
®
processors to easily interface with devices
using the Modbus RTU/ASCII serial communications protocol.
The MVI56E-MCM and MVI56E-MCMXT act as input/output modules on the
ControlLogix backplane, making Modbus data appear as I/O data to the
processor. Data transfer to and from the processor is asynchronous from the
communications on the Modbus network. Two independently configurable serial
ports can operate on the same or different Modbus networks. Each port can be
configured as a Modbus Master or Slave, sharing the same user-controlled,
10,000-word database.
The two modules are functionally the same. The MVI56E-MCM is designed for
standard process applications. The MVI56E-MCMXT is designed for the Logix-
XT™ control platform, allowing it to operate in extreme environments. It can
tolerate higher operating temperatures, and it also has a conformal coating to
protect it from harsh or caustic conditions.
6.1.1 General Specifications
Backward-compatible with previous MVI56-MCM version
Single Slot - 1756 ControlLogix
®
backplane compatible
10/100 MB Ethernet port for network configuration and diagnostics with Auto
Cable Crossover Detection
User-definable module data memory mapping of up to 10,000 16-bit registers