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FAQs
Q1: What is the primary function of the MVI56E-MCM?
It is a Modbus Master/Slave communication module that allows Rockwell Automation ControlLogix processors to interface with Modbus RTU/ASCII serial devices. It acts as an I/O module on the ControlLogix backplane, making Modbus data appear as standard I/O data to the processor.
Q2: How many Modbus commands and registers does the MVI56E-MCM support?
With Revision 3 firmware, the module supports up to 325 Modbus commands per port (up from 100 in Revision 2) and a total database of 10,000 16-bit registers (up from 5,000 in Revision 2) . To utilize the full capacity, the latest Add-On Instruction (AOI) must be used.
Q3: Does the MVI56E-MCM require additional configuration software?
No additional software is required for basic operation. Module configuration and communication are integrated within RSLogix 5000 (version 16 or higher) using Add-On Instructions . However, ProSoft Configuration Builder (PCB) is provided for advanced configuration, diagnostics, and network analysis, and can be accessed via the module's Ethernet port or CIPconnect.
Q4: What are the key differences between MVI56E-MCM and the classic MVI56-MCM?
The MVI56E-MCM is built on a modern ARM-based platform and features a dedicated Ethernet port for configuration and web-console access, whereas the classic MVI56-MCM required a serial cable for configuration. The E-series also offers native AOI support for Studio 5000, reducing commissioning time. Both share ladder logic and configuration file compatibility, allowing direct replacement without program changes.
Q5: Is the MVI56E-MCM hot-swappable?
Yes, the module supports Removal and Insertion Under Power (RIUP), allowing replacement while the ControlLogix chassis remains powered . However, standard safety precautions should be observed, as electrical arcing can occur during insertion or removal under power.
