Key Technical Specifications
- Communication Protocol: Modbus TCP/IP Client/Server
- Network Port: Single 10/100 Base-T Ethernet
- Data Map Capacity: 5000 Word (16-bit) user-customizable registers
- Backplane Compatibility: ControlLogix (1756 series)
- Slot Requirement: Single-slot module
- CIP Connect Support: Yes, via 1756-ENxT adapters
- Diagnostic Display: 4-character alphanumeric LED
- CMOS Backup: Lithium battery (21-day runtime)
- Shock Rating: 30 g operating, 50 g non-operating
- Vibration Rating: 5 g at 10–150 Hz
- Humidity Tolerance: 5% to 95% non-condensing
Product Introduction
PROSOFT MVI56E-MNET is a single-slot Modbus TCP/IP enhanced network interface module built for Allen-Bradley ControlLogix processors. It acts as a Modbus client or server to exchange data with Ethernet-enabled field devices.This module supports up to 5000 words of custom register mapping and includes a 24-hour CMOS battery backup to retain real-time clock and configuration data during power loss. It also features CIP Connect for remote diagnostics through existing EtherNet/IP networks.
Installation & Configuration Guide
Preparation (10 min)
Verify ControlLogix power supply has adequate backplane current margin (module draws 800 mA at 5 VDC). Download ProSoft Configuration Builder (PCB) software. Prepare Ethernet cable with auto-crossover capability.Removal (5–10 min)
Place PLC in Program mode. Disconnect Ethernet cable from existing module. Remove mounting screw and slide module straight out of backplane. Inspect backplane connector pins for damage.Installation (10 min)
Align MVI56E-MNET with backplane guide rails. Push firmly until fully seated. Secure mounting screw. Connect Ethernet cable to the 10/100 Base-T port. Verify LED display shows initialization sequence.Power-On & Test (10 min)
Cycle backplane power. Wait for 4-character LED to display “RUN” or assigned IP address. Open PCB software and use ProSoft Discovery Service (PDS) to locate module on network. Execute sample ladder logic to verify read/write operations.
Troubleshooting Quick Reference
| Symptom | Probable Cause | Action |
|---|---|---|
| Blank LED display | No backplane power or bad seat | Reseat module; measure 5 VDC at slot |
| “Err” on display | Firmware or config mismatch | Reload configuration via PCB software |
| No Ethernet link | Cable or port failure | Swap cable; verify auto-crossover LED |
| Timeout errors | IP subnet mismatch | Confirm module and controller share subnet |
| Data not updating | Register map misconfiguration | Verify read/write block addresses in PCB |
| IP lost after power cycle | Dead CMOS battery | Replace lithium cell; charge 24h minimum |
Dimensions, Mounting & Wiring Notes
- Mounting: Single-slot ControlLogix backplane insertion
- Retention: Single captive mounting screw
- Ethernet Port: Standard RJ45, auto-MDI/MDIX
- Wiring Note: Use CAT5e or better shielded cable; ground shield at cabinet only
- Clearance: Maintain 25 mm front clearance for airflow and cable bend radius
FAQ
Can I replace my old MVI56-MNET with this E-series module?
Yes. MVI56E-MNET is backward compatible with legacy MVI56-MNET. Existing ladder logic and configuration files transfer directly without modification.I can’t find the module on my network. What’s wrong?
First, check if the 4-character LED shows an IP address. If blank, the module hasn’t booted. If it shows “0.0.0.0”, use ProSoft Discovery Service (PDS) to assign a temporary IP. Also verify your PC is on the same subnet.Does this module need a separate license?
No. ProSoft MVI56E-MNET does not require additional licensing. Configuration software (PCB) is available free from the ProSoft Technology website.My CMOS battery died. Can I replace it in the field?
Technically yes, but the battery is soldered to the PCB. ProSoft recommends sending the module for factory replacement. If you must replace it yourself, ensure the module has been powered for 24 hours before removal to fully charge the replacement cell.How many Modbus connections can it handle simultaneously?
The module supports multiple concurrent TCP connections as both client and server. Exact limits depend on poll rate and packet size — check the PCB software’s network analyzer tool for real-time bandwidth utilization.Is this the same as the MVI56E-MNETC?
No. MVI56E-MNETC is the multi-client enhanced version with higher connection capacity. MVI56E-MNET is the standard single-client/server model. Verify your application’s concurrent connection requirements before selecting.
