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FAQs
Q1: What is the primary function of the MVI56E-MNETC?
It is a Modbus TCP/IP communication module that allows Rockwell Automation ControlLogix processors to communicate with multiple Modbus TCP/IP server devices (such as Modicon PACs) and to act as a Modbus TCP/IP server for SCADA/DCS systems. 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 TCP/IP connections does the MVI56E-MNETC support?
With Revision 3 firmware, the module supports up to 30 client connections (with 480 Modbus master commands) and up to 20 server connections . This allows the module to communicate with multiple server devices while simultaneously serving data to SCADA, HMI, or DCS systems .
Q3: What is the difference between the MVI56E-MNETC and the MVI56E-MNET?
The MVI56E-MNETC is a Multi-Client module optimized for applications where the ControlLogix system needs to control multiple Modbus TCP/IP server devices on the network. The MVI56E-MNET is a combined client/server module for standard Modbus TCP/IP communication. With Revision 3 firmware, the MNETC now also supports server functionality, making it the recommended choice for most applications .
Q4: Does the MVI56E-MNETC require additional programming in RSLogix 5000?
No additional complex programming is required. The module communication is integrated into RSLogix 5000 using a provided Add-On Instruction (AOI) or ladder logic sample file. The AOI handles data transfer between the module and the processor, and commands can be easily enabled or disabled from ladder logic without reconfiguring the module .
Q5: Is the MVI56E-MNETC backward compatible with older MVI56-MNETC modules?
Yes. The MVI56E-MNETC is backward compatible with earlier MVI56-MNETC modules. You can transfer the configuration from the old module to the new one by moving the CF card, and the existing ladder logic will continue to work. To take advantage of new features like the expanded 10,000-register database, the latest Add-On Instruction must be used.
