Description

MVI56E-MNETCR is an enhanced Modbus TCP/IP multi-client communication module designed by ProSoft for Rockwell ControlLogix (1756 platform). It focuses on multi-client + small data blocks and is suitable for remote racks and large-scale Modbus TCP device connections.

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MVI56E-MNETCR
Core positioning
Brand: ProSoft Technology (owned by Moxa)
Model: MVI56E-MNETCR (CR = Client Reduced data block)
Function: Modbus TCP/IP multi-client (master station), also serving as a server; EtherNet/IP ↔ Modbus TCP protocol conversion
Features: Smaller I/O data blocks, suitable for remote racks, ControlNet bridging scenarios Key specifications
Ethernet port: 2×RJ45, 10/100 Mbps, Auto-MDIX
Client capabilities: Up to 30 Clients, each Client up to 16 commands
Server capabilities: Supports 20 Server sessions (running simultaneously)
Modbus function codes: 1/2/3/4/5/6/7/15/16
Data mapping: Maximum 5000 16-bit registers, supports floating point
Backplane current: 800 mA @ 5 VDC; 3 mA @ 24 VDC
Operating temperature: 0°C ~ +60°C
Storage temperature: -40°C ~ +85°C
Humidity: 5%–95% RH, no condensation
Diagnosis: LED status indicator + on-board web server
Model Comparison (Simplified Version)
MVI56E-MNETCR: 30 Clients + 20 Servers, Small Data Blocks, Remote Rack Optimization
MVI56E-MNET: 100 Clients + 20 Servers, Standard Data Blocks
MVI56E-MNETXT: Wide Temperature Range (–25°C ~ 70°C) + Three-Barrier Coating, Extreme Environments

Core advantages
High-performance multi-client: 30 clients can operate in parallel, suitable for collecting data from dozens to hundreds of Modbus instruments / frequency converters / PLCs in a centralized manner.
Small data blocks (CR): Compared to the standard MNET, the I/O data area is smaller, and the delay and stability are lower and more stable when bridging remote racks / ControlNet.
Dual network ports + Web configuration: Two RJ45 ports can be used for network redundancy; built-in web interface, no need for software configuration and diagnosis.
CIPconnect bridging: Modules can be remotely configured and diagnosed via ControlNet/EtherNet/IP.
Compatible alternatives: Can directly replace the old MVI56-MNETR model without modifying the ladder diagram.

Typical application
Multiple Modbus TCP instruments/sensors in the factory → Centralized monitoring by ControlLogix
Oil and gas / water treatment: Remote pumping stations, instrument rooms – Modbus devices are networked together
Power: Substations’ integrated protection devices, electricity meters, UPS – connected to the Rockwell system
Remote racks (such as 1756-RIO) are connected to the Modbus network via ControlNet