ProSoft Technology MVI56E-MCM/MCMXT - 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