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Modbus Plus to EtherNet/IP Gateway


The ProLinx Modbus Plus to EtherNet/IP Gateway creates a powerful connection between devices on an EtherNet/IP network and a Modbus Plus device. This stand-alone DIN-rail mounted protocol gateway provides one Modbus Plus configurable DB9F port and one Ethernet port.

The Modbus Plus protocol driver supports both Master and Slave implementations of the protocol on the DB9 Female Modbus Plus port. The Modbus Plus port is fully configurable.

The EtherNet/IP protocol driver supports the Explicit Messaging implementation of the protocol. User-configurable as both a Client and a Server, the EtherNet/IP port is a very powerful data transfer tool

Features and Benefits


The MBP-DFNT modules are the ideal solution for the many applications where EtherNet/IP connectivity can be used to integrate a Modbus Plus device into a system. The EtherNet/IP gateway is a powerful module designed with both Client and Server support, enabling easy connection to Rockwell Automation PLCs (CLX, SLC, PLC, CPLX, and similar devices). In combination with the Modbus Plus support, the module provides a very powerful interface to the many Modbus Plus devices which are in use in the industrial marketplace today. Applications for the module are found in most industries, especially the Manufacturing, Oil and Gas, Electrical Power and Food Processing. EtherNet/IP (Explicit Messaging) Compatible Devices Rockwell Automation equipment that supports EPIC:

  •  PLC5/E rev C/N, D/E, E/D
  •  SLC5/05 series A, OS503 frn4
  •  1785-ENET Series A, rev D
  •  Interchange V6.2
  •  MicroLogix 1100/1400/ANY via 1761-NET-ENI
  •  CompactLogix 1768-L43/L45 via 1768-ENBT
  •  CompactLogix 1769-L32E/L35E/ANY
  •  CompactLogix L23E
  •  RSLinx Gateway V1.7+
  •  ControlLogix 1756-ENET/ENBT/EN2T/EN2TR


Internal Database

The ProLinx module contains an internal database that consists of areas for application data, status information, and configuration information.

The internal database is shared between all ports on the module and is used as a conduit to pass information from a device on one network to one or more devices on another network.

Application Data Area

The data area is used to store and retrieve data by the protocol drivers and for data exchange between protocols. The database is used as a source for write commands to remote devices and holds data collected from the remote devices. Commands defined in the configuration file (stored in the configuration data area) control how the data is to be handled in the database.

Status Data Area

This area is used to store error codes, counters, and port status information for each port.

Configuration Data Area

This area contains module configuration information such as port configuration, network information, and command configuration. This configuration file is downloaded to, or uploaded from, this area.




Power Supply

24 VDC nominal
18 to 32 VDC allowed
Positive, Negative, GND Terminals
2.5 mm screwdriver blade

Current Load

500 mA max @ 32 VDC max

Operating Temperature

-4° F to 122° F (-20° C to 50° C)

Storage Temperature

-40° F to 185° F (-40° C to 85° C)

Relative Humidity

5% to 95% (with no condensation )


 5.20 in H x 2.07 in W x 4.52 in D (13.2 cm x 5.25 cm x 11.48 cm)
 5.20 in H x 2.73 in W x 4.52 in D
(13.2 cm x 6.934 cm x 11.48 cm)

LED Indicators

Power and Module Status
Application Status
Serial Port Activity
Serial Port Error Status

Configuration Serial Port

DB-9M RS-232 only
No hardware handshaking

Ethernet Port (Ethernet modules only)

10Base-T half duplex RJ45 Connector
Link and Activity LED indicators
Electrical Isolation 1500 V RMS at 50 Hz to 60 Hz for 60 s, applied as specified in section 5.3.2 of IEC 60950: 1991
Ethernet Broadcast Storm Resiliency = less than or equal to 5000 [ARP] frames-per-second and less than or equal to 5 minutes duration

Application Ports

Modbus Plus Connector
Two DB9 Female Standard Modbus Plus connectors

Serial Port Isolation

2500 V RMS port signal isolation per UL 1577
3000 VDC min. port to ground and port to logic power isolation

Shipped with Each Unit

Mini-DIN to DB-9M serial cables
4 ft RS-232 configuration cable
2.5mm screwdriver
CD (docs and Configuration utility)
RS-422/485 DB-9 to Screw Terminal Adaptor (1 or 4, depending on ports)


MBP Protocol Specification

The Modbus Plus protocol driver supports both Master and Slave implementations of the protocol on the DB9 Female Modbus Plus port. The Modbus Plus port is fully configurable.

Protocol Specifications

The Modbus Plus protocol driver exists in dual Modbus Plus Ports (MBP). The driver can be configured on an individual port basis as either a master or a slave to interface with other Modbus Plus devices.

General Parameters

Modbus Function Codes

3: Read Multiple Data Registers (MSTR 2)
16: Write Multiple Data Register (MSTR 1)
Global data read (32 words per node max.)
Global data write (32 words per node max.)

Address Scope

1 to 64

Modbus Plus Functioning as a Master

Command List

Up to 200 commands on the master port, fully configurable for function, slave address, register to/from addressing and word count

Polling of command list

Configurable polling of command list, including continuous read or write commands and write on change of data (Function Code 16 Write command only)"

Modbus Plus Functioning as a Slave

Node address

1 to 64 (software selectable)

DFNT Protocol Specification

The EtherNet/IP protocol driver supports the Explicit Messaging implementation of the protocol. User-configurable as both a Client and a Server, the EtherNet/IP port is a very powerful data transfer tool.

Protocol Specifications

The EtherNet/IP protocol is one of the primary connectivity tools to the different Rockwell Automation platforms. The Explicit Messaging aspect of the protocol (only) has been implemented in the ProLinx units to provide the data transfer link between the ProLinx units and the Rockwell Automation hardware.

General Protocol Information


Explicit Messaging supported


125 word read and write data lengths
Floating point data supported

EtherNet/IP Server Specifications

In Server mode, the module accepts commands from one or more clients to read/write data stored in the module's internal registers.

EtherNet/IP Server Specifications


Five independent TCP server sockets permit remote clients to interact with all data contained in the module.

Data File

Data Table File Start - Fixed at N10
Data Table File Size - 100 or 1000 words

CIP Services Supported

0x4C - CIP Data Table Read
0x4D - CIP Data Table Write

EtherNet/IP Client Specifications

In Client mode, the module controls the read/write data transfer between the gateway and other EtherNet/IP devices. Data transfer can be initiated and executed without any ladder programming being required in the Rockwell Automation hardware.

EtherNet/IP Client Specifications


One client

Command List

Support for 100 commands, each configurable for command, IP address, register to/from addressing and word/bit count.

Polling of command list

User configurable polling of commands, including disabled, continuous and on change of data (write only).

EtherNet/IP (Explicit Messaging) Compatible Devices

List of Rockwell Automation material that support EPIC:

  • PLC5/E rev C/N, D/E, E/D
  • SLC5/05 series A, OS503 frn4
  • 1785-ENET Series A, rev D
  • Interchange V6.2
  • MicroLogix 1100/1400/ANY via 1761-NET-ENI
  • CompactLogix 1768-L43/L45 via 1768-ENBT
  • CompactLogix 1769-L32E/L35E/ANY via 1761-NET-ENI
  • RSLinx Gateway V1.7+
  • ControlLogix 1756-ENET/ENBT/EN2T


ProSoft Configuration Builder (PCB) Last Modified 04/07/2014
MBP DFNT Datasheet 71.53 kB Last Modified 04/26/2010
MBP Protocol Manual 674.78 kB Last Modified 02/14/2012
DFNT Protocol Manual 2.03 MB Last Modified 07/24/2013
PLX EDS File 333.95 kB Last Modified 05/10/2010


Ex Certificate (ATEX Directive) 114.27 kB Last Modified 11/11/2013
CB Safety 35.78 kB Last Modified 08/27/2012
CE Mark 92.33 kB Last Modified 02/28/2013
Russian GOST-R 7.07 MB Last Modified 02/22/2013
GOST-R Declaration of Conformity 6.68 MB Last Modified 02/22/2013
UL/cUL; Class 1, Div 2 1.08 MB Last Modified 07/02/2013
UL/cUL; Class 1, Div 2 (Canada) 1.10 MB Last Modified 07/02/2013