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Key Technical Specifications
- Product Model: MVI56-MNETC
- Manufacturer: ProSoft Technology
- Compatible PLC Platforms: Allen-Bradley ControlLogix (1756), CompactLogix (1769/5370/5380) via adapter
- Communication Protocol: Modbus TCP/IP (Client and/or Server simultaneously)
- Ethernet Ports: 2 × 10/100 Mbps (independent, non-switched)
- Max Connections: Up to 32 Modbus TCP clients/servers per port
- Command Capacity: Supports up to 100 read/write commands total
- Data Buffer: 4 MB user-configurable data mapping between Modbus registers and PLC tags
- Configuration Tool: ProSoft Configuration Builder (integrated with Studio 500 Web Edition)
- Diagnostics: Real-time status via ladder logic tags, LED indicators (Link/Activity), web-based diagnostics page
- Mounting: Direct slot in ControlLogix chassis; CompactLogix via 1769-LSP or 5090-ARMxx adapter
- Certifications: UL, CE, RoHS; supports industrial temperature range (0°C to 60°C)
Core Performance and Selection Advantages
The MVI56-MNETC is a purpose-built, in-rack communication gateway that eliminates the need for external protocol converters or standalone gateways when integrating Modbus TCP/IP devices into Rockwell control architectures. Unlike software-based solutions or third-party OPC servers, it operates autonomously on the backplane, offloading communication tasks from the main PLC CPU—ensuring deterministic performance even under heavy I/O or logic loads.
Key integrator benefits include:
- Zero additional footprint: No external DIN rail devices or network switches required.
- Low-latency polling: Sub-10 ms update rates achievable for critical data (e.g., protective relay status).
- Bidirectional mapping: Seamless exchange between Modbus holding/input registers and PLC tags without custom code.
- Cyber-resilient design: Supports VLAN tagging, static IP, and optional firewall rules via web interface; no open OS vulnerabilities.
- Hot configuration: Modify Modbus maps online without stopping the PLC.
ProSoft MVI56-MNETC
System Integration and Expandability
Integration into a Rockwell system is streamlined through Studio 5000 Logix Designer. The module appears as a standard I/O connection, with all configuration parameters (IP address, command list, data mapping) stored in the controller project. This ensures full version control, automated deployment, and simplified troubleshooting during commissioning.
The dual Ethernet ports enable flexible topologies:
- Port 1: Connect to plant LAN for SCADA or historian access (as Modbus Server)
- Port 2: Dedicated daisy-chain to field devices (as Modbus Client)
For cybersecurity compliance (e.g., NERC CIP, ISO 27001), the module supports:
- Disabling unused services (e.g., HTTP, Telnet)
- MAC/IP filtering
- Secure firmware updates via ProSoft’s tools
Future scalability is ensured by ProSoft’s active product roadmap—this module is part of a broader MVI56 family with variants for PROFIBUS, DF1, DNP3, and IEC 61850, allowing consistent architecture across multi-protocol sites.
Recommendation for New Projects
The ProSoft MVI56-MNETC remains a best-in-class solution for Modbus TCP integration in Rockwell environments. With ongoing firmware enhancements, long-term availability commitments, and full compatibility with current Logix platforms (including CompactLogix 5380), it is a low-risk, high-value choice for both greenfield and retrofit automation projects where reliability, performance, and lifecycle support are critical.
