EtherNet/IP to Modbus Serial 4 Port


The EtherNet/IP® to Modbus Serial gateway offers bi-directional data transfers between Modbus Serial and the EtherNet/IP network. Our EtherNet/IP Driver uses Class 1 I/O connections and/or Class 3 Message instructions. Protocol conversion gateways are the ideal solution for distributed networks when adding a remote rack becomes too costly.

The PLX31-EIP-MBS4 gateways are stand-alone DIN-rail mounted gateways that provide one Ethernet port for communication, allowing for remote configuration and diagnostics, and up to four (4) serial communication ports. The PLX30 gateways also come with an SD Card slot (SD card optional) for storing configuration files. In the event of a failure the SD card can be transferred to another gateway reducing downtime. These gateways also come with a wide input power range (10 Vdc – 36 Vdc), and an extended temperature range (-25°C to 70°C ). The PLX30 gateways include all the necessary cables required for communication.

A conformal coating option is available for this product.


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Características y Beneficios

  • Data prioritization: Multiple I/O connections allow you to set RPIs for status and/or control data, optimizing Ethernet bandwidth. 
  • Includes an embedded EDS Add-On Profile, allowing for simplified integration and reduced commissioning time. 
  • Includes a SD card slot (SD card optional) for storing configuration files. This can be used for disaster recovery. 
  • Four serial ports allow for connectivity of up to 400 Modbus® devices, reducing the amount of gateways required for your application. 
  • ProSoft Discovery Service: This utility allows your PC to see the gateway and change its default IP address without being on the same subnet. 
  • Secure module configuration via module switch (v1.04 and greater). 
  • Up to 10,000 16-bit registers can be used to exchange large amounts of data.


EtherNet/IP™ Specifications 



Number of Class 3 Server Connections


Supported PLC Types


Supported Message Types


Class 3 Client Connections

Connected: 2
Unconnected: 1

Number of Class 1 I/O Connections


I/O connection sizes


Max RPI time

5 ms per connection

CIP Services Supported

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

Command List

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

Command Sets

PLC-2/PLC-3/PLC5 Basic Command Set
PLC5 Binary Command Set
PLC5 ASCII Command Set
SLC500 Command Set

Modbus Serial Specifications 



Command List

Up to 100 commands per Master port, each fully configurable for Function Code, slave address, register to/from addressing and word/bit count.

Supported Modbus Function Codes

1: Read Coil Status
2: Read Input Status
3: Read Holding Registers
4: Read Input Registers
5: Force (Write) Single Coil
6: Preset (Write) Single Holding Register

15: Force (Write) Multiple Coils
16: Preset (Write) Multiple Holding Registers
22: Mask Write Holding Register (Slave Only)
23: Read/Write Holding Registers (Slave Only)

Software configurable communication parameters

Baud rate: 110 baud to 115.2 kbps
Parity: None, Even, Odd
Data Size: 7 or 8 bits
Stop bits: 1 or 2
RTS on/off delay: 0 to 65535 milliseconds
Modbus RTU mode (binary) with CRC-16
Modbus ASCII mode with LRC error checking
Floating Point Data Floating point data movement supported, including configurable support for Enron and Daniel implementations

Polling of Command List

Configurable polling of command list, including continuous and on change of data, and dynamically user or automatic enabled.

Status Data

Error codes available on an individual command basis. In addition, a slave status list is maintained

Node Address

1 to 247 (software selectable)

RS Interface

RS232, RS422, and RS485

Transmit and Receive Buffer Size

255 byte Transmit character length with 0 to 65535 millisecond delay between each transmitted character




Power Supply

24 Vdc nominal
10Vdc to 36 Vdc allowed
Positive, Negative, GND Terminals

Current Load

24 Vdc nominal @ 300mA
10 to 36 Vdc @ 610mA maximum

Operating Temperature

-25°C to 70°C (-13°F to 158°F )

Storage Temperature

-40°C to 80°C (-40°F to 176°F )

Relative Humidity

5% to 95% RH with no condensation


IEC 60068-2-27; 15G @ 11ms, 3-Axis (Operational)
IEC 60068-2-27; 30G @ 18ms, 3-Axis (Non-Operational)


IEC 60068-2-6; 5G @ 10Hz to 150Hz

(Height x Width x Depth)

Standard: 5.38 in x 1.99 in x 4.38 in
(13.67 cm x 5.05 cm x 11.13 cm)

LED Indicators

Configuration (CFG) and Error (ERR) Communication Status
Power (PWR) and Hardware Fault (FLT)
Network Status (NS) EtherNet/IP Class I or Class III Connection Status
Module Status (MS) Module Configuration Status
Ethernet Communication Port Link/Activity and 100mbit
Serial Communication Port Receive (RX) and Transmit (TX)

Ethernet Port

10/100 Base-T half-duplex RJ45 Connector Electrical Isolation 1500 Vrms at 50 Hz to 60 Hz for 60 seconds, 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

Serial Ports


Serial Port Isolation

2500 Vrms port signal isolation per UL 1577 serial port communication signal uses RF(Radio Frequency) modulation signal as isolation media, IC chip model is SiliconLabs Si844x(Si8440,Si8441,Si8442).

Shipped With Each Unit

2.5 mm screwdriver, J180 Power Connector,
(1 to 4) RJ45-DB9M Serial Adapter Cable (serial protocol),
(1 to 4) DB9 to Screw Terminal Adapter (serial protocol)


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