Description
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | ProSoft Technology |
| Model | MVI56-MNETR |
| Product Type | Modbus TCP/IP Interface Module |
| Platform | ControlLogix |
| Installation | Single-slot 1756 chassis |
| Application | Local or remote rack |
| Protocol | Modbus TCP/IP |
| Ethernet | 10/100Base-T |
| Connector | RJ45 |
| Modbus TCP Port | TCP 502 |
| Data Memory | Up to 5,000 registers |
| Memory Mapping | User configurable |
| Backplane Load | 800 mA @ 5 VDC; 3 mA @ 24 VDC |
| Operating Temperature | 0 to 60°C |
| Storage Temperature | -40 to 85°C |
| Relative Humidity | 5–95%, non-condensing |
| Shock | 30 g operational / 50 g non-operational |
| Vibration | 5 g, 10–150 Hz |
| Ethernet Isolation | 1500 V RMS, 50/60 Hz for 60 s |
| Configuration Software | ProSoft Configuration Builder |
| PLC Programming | RSLogix 5000 / ControlLogix |
| Communication Method | Block transfer / side-connect data exchange |
| Status Indication | Module, backplane, application and communication LEDs |
These specifications come directly from the ProSoft user manual and datasheet.
MVI56-MNETR
Product Overview
The ProSoft MVI56-MNETR is a dedicated Modbus TCP/IP communication module designed for Rockwell Automation ControlLogix systems. It occupies one slot in a 1756 chassis and acts as an interface between the ControlLogix processor and devices communicating through Modbus TCP/IP. ProSoft describes the module specifically as a “Modbus TCP/IP Interface Module with Reduced Data Block,” distinguishing it from the standard MVI56-MNET module.
The ProSoft MVI56-MNETR is particularly useful where the communication module is installed in a remote ControlLogix rack and the application needs a smaller I/O data image between the module and processor. The module provides a 10/100Base-T Ethernet interface and supports a user-defined memory area of up to 5,000 16-bit registers.
The MVI56-MNETR can operate as a Modbus TCP/IP client and provides server functionality as documented by ProSoft. The ControlLogix processor exchanges data with the module through the 1756 backplane, while the module handles Modbus TCP/IP network transactions asynchronously. This architecture keeps Modbus communication processing separate from the ControlLogix processor’s normal application logic.
Main Features & Advantages
Reduced-data-block architecture
The defining feature of the MVI56-MNETR is its reduced data-block architecture. ProSoft designed it for applications where minimizing the amount of data exchanged across the ControlLogix backplane is useful, particularly in remote rack installations.
5,000-register data space
The module can store and transfer up to 5,000 registers between the Modbus TCP/IP network and the ControlLogix processor. The memory mapping is user configurable, allowing the application engineer to determine how Modbus data is represented within the ControlLogix interface.
10/100Base-T Ethernet
The application port uses a standard RJ45 10/100Base-T Ethernet connection. The manual also specifies link/activity indication and electrical isolation.
Remote-rack operation
The MVI56-MNETR can be installed in a local or remote ControlLogix rack. For remote applications, communication with the processor is carried through EtherNet/IP or ControlNet infrastructure.
ControlLogix integration
The module is recognized by the ControlLogix platform as an I/O module. ProSoft provides sample ladder logic and Add-On Instruction resources for data transfer and configuration.
Configuration and diagnostics
ProSoft Configuration Builder supports module configuration and diagnostics. The module also includes a separate configuration/debug interface, while the Ethernet application port handles Modbus TCP/IP communication.
Replacement & Compatibility Checks
Before replacing a , verify:
- Exact model:
- ControlLogix chassis type
- Available 1756 slot
- Local versus remote-rack installation
- Existing firmware revision
- Modbus TCP client/server configuration
- Modbus device IP addresses
- TCP port configuration
- Register mapping
- ControlLogix tag structure
- Existing ladder logic/AOI
- ProSoft Configuration Builder configuration
- Required data-block size
- Ethernet network architecture
One important point: is not simply a generic Ethernet module. It performs protocol conversion between the ControlLogix environment and Modbus TCP/IP devices. Replacing it with a standard 1756 Ethernet communication module will not automatically reproduce the same Modbus functionality.
vs. -MNET
The distinction matters during procurement:
| Feature | -MNET | |
|---|---|---|
| Modbus TCP/IP | Yes | Yes |
| ControlLogix | Yes | Yes |
| Single-slot 1756 | Yes | Yes |
| 10/100 Ethernet | Yes | Yes |
| Maximum register space | 5,000 | 5,000 |
| Reduced data block | Yes | No |
| Remote rack focus | Yes | Local or remote |
| Typical use | Remote rack / reduced data transfer | General ControlLogix Modbus TCP |
ProSoft specifically states that is intended for remote-rack applications with a smaller data packet size, while the standard -MNET is the general Modbus TCP/IP interface module.
Procurement Note
Recommended description:
oSoft — Modbus TCP/IP Interface Module with Reduced Data Block for Rockwell ControlLogix, Single-Slot 1756, 10/100Base-T Ethernet, 5,000-Register Data Space
The is now listed by ProSoft under its legacy ControlLogix products, so for a replacement purchase, verify the exact hardware/firmware revision and preserve the existing Modbus configuration and ControlLogix application data.
