Description
ProSoft 5202-DFNT-MCM4 | EtherNet/IP to Modbus Gateway | 4-Port Serial Integration
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | ProSoft Technology |
| Model | 5202-DFNT-MCM4 |
| Product Family | ProLinx Gateway |
| Product Type | EtherNet/IP to Modbus Master/Slave Gateway |
| Ethernet Protocol | EtherNet/IP Explicit Messaging |
| Ethernet Interface | 10/100Base-T RJ45 |
| Serial Ports | 4 |
| Serial Protocol | Modbus RTU / Modbus ASCII |
| Serial Operating Mode | Master or Slave |
| Serial Interface | RS-232 / RS-422 / RS-485, configuration-dependent |
| Power Supply | 24 VDC nominal |
| Permitted Supply | 18–32 VDC |
| Maximum Current | 500 mA at 32 VDC maximum |
| Operating Temperature | -20°C to +50°C |
| Storage Temperature | -40°C to +85°C |
| Relative Humidity | 5–95%, non-condensing |
| Ethernet Isolation | 1500 Vrms |
| Serial Port Isolation | 2500 Vrms |
| Mounting | DIN rail |
| Configuration Tool | ProSoft Configuration Builder |
| Product Status | Legacy / replaced by PLX31-EIP-MBS4 |
The 5202- documentation identifies it as a ProLinx Modbus Master/Slave gateway. Its EtherNet/IP side uses Explicit Messaging, while the gateway provides four serial ports for Modbus communications. The published hardware specification gives 24 VDC nominal power, 18–32 VDC allowable input, and four isolated serial ports.
Product Introduction
The ProSoft 5202- is a ProLinx industrial communication gateway designed to connect EtherNet/IP-based control systems with Modbus serial equipment. It provides one Ethernet interface and four serial communication ports, allowing multiple Modbus networks or device groups to be integrated into a PLC or supervisory system without replacing the installed serial field devices. The EtherNet/IP driver supports Explicit Messaging and can be configured for client and server operation.
The four-port architecture is particularly useful in brownfield automation projects where drives, meters, analyzers, temperature controllers, RTUs, or package equipment still use Modbus RTU or ASCII. Instead of adding separate protocol converters for every serial segment, the can consolidate several Modbus connections behind a single EtherNet/IP interface. ProSoft’s current documentation also confirms a direct migration path from this legacy gateway to the PLX31-EIP-MBS4, including conversion of existing configuration files.
5202-DFNT-MCM4
Application Scenarios & Field Pitfalls — The Engineer’s Perspective
Engineering Pain Point
The difficult part of a PLC migration is often not the PLC itself. It is the large installed base of serial devices that cannot be economically replaced. A plant may have dozens of Modbus instruments, drives, meters, or package controllers while the new control architecture is based on EtherNet/IP. The 5202- addresses this protocol boundary directly.
Typical Applications
1. Rockwell PLC and Modbus Integration
The gateway can connect EtherNet/IP-based controllers with legacy Modbus RTU/ASCII devices, allowing existing field equipment to remain in service during control-system upgrades.
2. Multi-Segment Modbus Networks
Four serial ports allow different device groups to be separated by port instead of placing every instrument on one long serial network.
3. Motor Drive and Meter Integration
Typical brownfield applications include connecting serial drives, power meters, process instruments, analyzers, and packaged equipment to an EtherNet/IP control network.
4. Legacy System Migration
The gateway is useful when replacing or upgrading PLC hardware while retaining existing Modbus equipment. ProSoft specifically documents migration from the 5202- to the newer PLX31-EIP-MBS4.
Technical Pitfalls
1. It is a gateway, not a PLC communication card.
The is a stand-alone ProLinx gateway. It should not be treated as an in-chassis ControlLogix or CompactLogix module. The Ethernet and serial networks are connected through the gateway’s own interfaces.
2. EtherNet/IP uses Explicit Messaging.
Do not assume that the gateway behaves like a modern EtherNet/IP I/O adapter with a conventional cyclic I/O assembly model. The legacy 5202 documentation specifically identifies Explicit Messaging as its EtherNet/IP implementation.
3. Serial port configuration is critical.
RS-232, RS-422, and RS-485 wiring have different electrical and topology requirements. A Modbus configuration with the correct baud rate and address can still fail because the physical interface or termination is wrong.
4. Modbus polling determines practical performance.
Large command lists, long response times, excessive retries, and poorly organized register reads can produce slow updates even when the Ethernet connection is healthy. Diagnose serial scan time separately from EtherNet/IP communication.
5. Preserve the configuration before replacing the gateway.
The configuration contains the IP settings, Modbus commands, port parameters, data mapping, and other application information. ProSoft’s migration documentation specifically provides a method for converting an existing file for use with the PLX31-EIP-MBS4.
6. Legacy replacement planning matters.
ProSoft’s official legacy-product table lists 5202- → PLX31-EIP-MBS4. This means a replacement project should distinguish between maintaining an existing legacy spare and performing a controlled modernization.
7. Verify the serial wiring before replacing hardware.
When only one Modbus port fails, check the port’s RS-232/422/485 configuration, cable pinout, termination, slave address, baud rate, parity, and response timeout before declaring the gateway defective.
Related Products
- ProSoft 5202- — Legacy EtherNet/IP-to-Modbus Master/Slave four-port gateway.
- — Current replacement path identified by ProSoft for the 5202-.
- ProSoft 5202-MNET-MCM4 — Related four-port Modbus gateway using Modbus TCP rather than the 5202- EtherNet/IP architecture.
- ProSoft 5201-DFNT-MCM — Earlier ProLinx EtherNet/IP-to-Modbus gateway with a different port architecture.
- ProSoft 5202-DFNT-ASCII4 — Four-port EtherNet/IP-to-ASCII gateway for non-Modbus serial devices.
- ProSoft 5202-DFNT-DFCM4 — Four-port EtherNet/IP-to-DF1 family gateway; different serial protocol.
- ProSoft PLX31-MBTCP-MBS4 — Newer Modbus TCP-to-Modbus serial four-port gateway; not a direct EtherNet/IP replacement.
- ProSoft ProLinx Gateway Family — Legacy family containing multiple Ethernet-to-serial protocol converters.
Procurement Note
For an installed , obtain the original configuration file before replacing the hardware whenever possible. Record the Ethernet configuration, all four serial-port settings, Modbus command lists, slave addresses, register mapping, and PLC-side messaging structure.
If the objective is simply to maintain an existing legacy installation, match the hardware and revision. If the objective is modernization, ProSoft’s documented replacement is , and the existing configuration can be converted rather than recreated entirely from scratch.
Engineering classification: ProSoft Technology 5202- is a legacy ProLinx four-port EtherNet/IP-to-Modbus RTU/ASCII Master/Slave gateway for integrating serial field devices with EtherNet/IP control systems.
