Reference MVI56-MCM ♦ ControlLogix Platform
Modbus Communication Module
ProSoft Technology, Inc. Page 85 of 159
July 24, 2008
8 Reference
In This Chapter
Product Specifications...........................................................................85
Functional Overview..............................................................................87
Cable Connections ..............................................................................105
MVI56-MCM Database Definition ........................................................111
MVI56-MCM Configuration Data .........................................................111
MVI56-MCM Status Data Definition.....................................................119
MVI56-MCM Command Control ..........................................................121
MVI56-MCM User Defined Data Types ............................................... 121
Modbus Protocol Specification ............................................................127
Using the Sample Program - RSLogix Version 15 and earlier............. 137
8.1 Product Specifications
The MVI56 Modbus Master/Slave Communication Module allows ControlLogix
processors to interface easily with other Modbus protocol compatible devices.
Compatible devices include not only Modicon PLCs (which all support the
Modbus protocol) but also a wide assortment of end devices. The module acts as
an input/output module between the Modbus network and the ControlLogix
processor. The data transfer from the processor is asynchronous from the
actions on the Modbus network. A 5000-word register space in the module
exchanges data between the processor and the Modbus network.
8.1.1 Features and Benefits
The MVI56 Modbus Master/Slave Communications module is designed to allow
ControlLogix processors to interface easily with Modbus protocol-compatible
devices and hosts.
The MVI56-MCM module acts as an input/output module between the Modbus
network and the ControlLogix processor. The data transfer from the ControlLogix
processor is asynchronous from the actions on the Modbus network. A 5000-
word register space in the module exchanges data between the processor and
the Modbus network.
Many host SCADA applications support the Modbus protocol, while devices
commonly supporting the protocol include several PLCs, as well as many other
third party devices in the marketplace. (For a partial list of devices that speak
Modbus, please visit the ProSoft Tested section of the ProSoft Technology web
site).
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