PLX31-EIP-SIE, Siemens Industrial Ethernet, Ethernet/IP, ProLinx,

Modbus TCP/IP to Siemens Industrial Ethernet Gateway


ProSoft Technology’s Modbus® TCP/IP to Siemens Industrial Ethernet gateway allows high-speed bi-directional data transfers between Modbus® TCP/IP controllers and Siemens® S7-400, S7-300, S7-200, S7-1200, and S7-1500 PACs.

In addition, the gateway includes several features, including data prioritization, that allow for simplified integration, reduced commissioning time and optimized performance.


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Features and Benefits

  • ProSoft Discovery Service utility allows your PC to see the gateway and edit its default IP address without being on the same subnet.
  • Supports up to 20 simultaneous client & server connections, allowing for faster communication between devices such as HMIs, SCADA systems, power monitors and flow computers, among others.
  • In addition to S7 controllers, the gateway can also be used with Siemens® S5 controllers with an appropriate interface.
  • Gateway includes a SD card slot (SD card optional) for storing configuration files. This can be used for disaster recovery.
  • 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.


Modbus® TCP/IP Specifications



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)

Supported Clients


Supported Servers

Encapsulated: 5

Command List

Up to 160 fully configurable Client commands

Status Data

Error codes reported individually for each command

Command List Polling

Each command can be individually enabled or disabled;
write-only-on-data-change is available

Siemens® Industrial Ethernet Specifications



Supported PLC Data Exchange (Read and Write)

Siemens S7-200, S7-300, S7-400, S7-1200, S7-1500

Supported Register Types

DB, Inputs, Outputs, Flags, Counters, Timers

Supported Clients





Power Supply

24 VDC nominal

10 to 36 VDC allowed

Positive, Negative, GND Terminals

Current Load

24 VDC nominal @ 300 mA

10 to 36 VDC @ 610 mA 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)


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

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


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

Relative Humidity

5% to 95% RH with no condensation

Dimensions (H x W x D)

5.38 x 1.99 x 4.38 in

13.67 x 5.05 x 11.13 cm

LED Indicators

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

Ethernet Port

10/100Mbit half-duplex RJ45 Connector Electrical Isolation 1500 Vrms at 50 to 60 Hz for 60 seconds, applied as specified in section 5.3.2 of IEC 60950: 1991 Ethernet Broadcast Storm Resiliency is less than or equal to 5000 [ARP] frames-per-second and less than or equal to 5 minutes duration

Shipped With Each Unit

2.5 mm screwdriver J180 Power Connector


ATEX Letter of Conformity 107.32 kB Last Modified 05/12/2022
CB Safety 348.30 kB Last Modified 10/20/2022
Korean KC Registration 974.32 kB Last Modified 07/07/2020
UL Certificate of Compliance 233.35 kB Last Modified 11/16/2022
Declaration of Conformity (RoHS/CE) 114.24 kB Last Modified 06/01/2022
Country Approval - Eurasian Customs Union Conformity (EAC) (Wired) 1.92 MB Last Modified 07/10/2020
Declaration of REACH Compliance 145.49 kB Last Modified 06/01/2022