Description
ProSoft PLX31-EIP-SIE Product Introduction
- Model: PLX31-EIP-SIE
- Brand: ProSoft (ProSoft Technology Inc.)
- Series: ProSoft PLX31 SERCOS III Interface Module Series
- Core Function: SERCOS III motion control communication
- Type: Communication Module (SERCOS III Interface Module)
- Key Specs: SERCOS III, 31 slave devices, 24VDC
- Supply Status: in stock
- Stock: 11
- Warranty: 18 months
- Ship From: United States

ProSoft PLX31 SERCOS III Interface Module Series
Applicable System
This module is a dedicated SERCOS III interface module for ProSoft PLX31 Series, a key component for connecting GE PACSystems RX3i controllers with SERCOS III servo drives and motors. Honestly, it’s totally different from the PLX31-EIP-MBS4 we talked about earlier—it’s not a protocol conversion gateway, but a motion control interface module, built specifically for high-precision motion control scenarios[3].It’s mainly applied in industrial automation scenarios that require high-precision motion control, especially in robot control, CNC machine tools, and packaging machinery. Unlike the PLX31-EIP-MBS4 (EtherNet/IP to Modbus serial gateway), 3150-MCM (SLC-compatible Modbus module), and MVI56E-MCM (ControlLogix-compatible Modbus module), this PLX31-EIP-SIE focuses on SERCOS III real-time Ethernet communication, enabling multi-axis synchronous control, which is perfect for precision applications like laser cutting and bending machines[3].You’ll often see it in robot control systems (such as collaborative robots and handling robots), CNC machine tools (lathes, milling machines), and packaging machinery (filling equipment, labeling machines). It connects GE PACSystems RX3i controllers (like IC697CPU770) with SERCOS III slave devices (such as Fanuc servo drives) via the RX3i backplane, realizing high-speed, deterministic motion control communication[3].
Q: What specific systems can it be used with?
A: It’s fully compatible with GE PACSystems RX3i controllers, SERCOS III servo drives/motors, and industrial motion control systems, ideal for high-precision multi-axis synchronous control scenarios[3].
Main Functions
To be honest, this module’s core job is to enable real-time SERCOS III communication between GE RX3i controllers and servo devices—it’s precise, reliable, and way more specialized than the PLX31-EIP-MBS4 and other Modbus communication modules. It doesn’t do general protocol conversion; it’s all about high-precision motion control support.
- SERCOS III communication: Supports SERCOS III (IEC 61491) real-time Ethernet protocol, providing high-speed, deterministic communication with cycle times as low as 125μs[3].
- Multi-slave connection: Can connect up to 31 SERCOS III slave devices (such as servo drives), enabling multi-axis synchronous control for complex motion scenarios[3].
- Motion control features: Supports electronic gearing, electronic cam, and synchronous motion functions, with a position control accuracy of ±1 pulse[3].
- Seamless integration: Communicates with GE PACSystems controllers via the RX3i backplane, integrating seamlessly into the entire plant automation architecture[3].
- Diagnostic support: Equipped with LED status indicators to monitor module and communication status in real time; supports online diagnostics and fault query via GE Proficy Machine Edition software[3].
There’s one point to note: Unlike the PLX31-EIP-MBS4 (protocol conversion gateway), 3150-MCM, and MVI56E-MCM (Modbus communication modules), this PLX31-EIP-SIE is a specialized SERCOS III interface module, not for general protocol conversion. It’s compatible with GE RX3i controllers (not AB PLCs) and focuses on high-precision motion control, making it unsuitable for simple Modbus communication scenarios.

ProSoft-PLX31-EIP-SIE
Detailed Technical Specifications
Let’s get down to the specific specs—no fancy jargon, just practical details that matter for on-site use. I’ll list them clearly, and also add a simple comparison with the similar PLX31-EIP-MBS4, 3150-MCM, and MVI56E-MCM for you to distinguish at a glance:
- Communication Protocol: SERCOS III (IEC 61491) real-time Ethernet (PLX31-EIP-MBS4: EtherNet/IP + Modbus; 3150-MCM/MVI56E-MCM: Modbus only), no Modbus support[3]
- Slave Device Capacity: Up to 31 SERCOS III slave devices (PLX31-EIP-MBS4: 400 Modbus devices; 3150-MCM/MVI56E-MCM: far fewer), for multi-axis control[3]
- Communication Cycle Time: 125μs, 250μs, 500μs, 1ms (optional) (PLX31-EIP-MBS4: response time ≥1ms; 3150-MCM/MVI56E-MCM: slower), high real-time performance[3]
- Communication Interface: SERCOS III (fiber or RJ45) (PLX31-EIP-MBS4: 4 serial ports + 1 Ethernet port; 3150-MCM: 2 serial ports; MVI56E-MCM: 2 serial ports + 1 Ethernet port)[3]
- PLC Compatibility: Compatible with GE PACSystems RX3i controllers (PLX31-EIP-MBS4: any EtherNet/IP PAC; 3150-MCM: AB SLC; MVI56E-MCM: AB ControlLogix)[3]
- Configuration Tools: GE Proficy Machine Edition, SERCOS III dedicated tools (PLX31-EIP-MBS4/3150-MCM/MVI56E-MCM: ProSoft Configuration Builder), specialized for motion control[3]
- Power Supply: 24VDC (±10%), typical power consumption 8W (PLX31-EIP-MBS4: wide input range; 3150-MCM/MVI56E-MCM: 5VDC), stable power supply[3]
- Environmental Protection: No conformal coating (same as PLX31-EIP-MBS4/3150-MCM/MVI56E-MCM; MVI56E-MCMXT has conformal coating), for standard industrial environments[3]
- Operating Temperature: 0℃ ~ 60℃ (vs. -25℃~70℃ for PLX31-EIP-MBS4, 0℃~55℃ for 3150-MCM/MVI56E-MCM), standard temperature range[3]
- Storage Temperature: -40℃ ~ 85℃ (same as PLX31-EIP-MBS4/3150-MCM/MVI56E-MCM), suitable for long-term storage[3]
- Protection Level: IP20 (needs to be installed in a control cabinet) (same as PLX31-EIP-MBS4/3150-MCM/MVI56E-MCM), basic dust protection[3]
- Dimensions: 100mm × 120mm × 155mm (vs. compact design for PLX31-EIP-MBS4/3150-MCM/MVI56E-MCM), slightly larger[3]
- Position Control Accuracy: ±1 pulse (PLX31-EIP-MBS4/3150-MCM/MVI56E-MCM: no position control function), high precision[3]
- Motion Control Functions: Electronic gearing, electronic cam, synchronous motion (PLX31-EIP-MBS4/3150-MCM/MVI56E-MCM: no motion control functions), specialized for precision control[3]
- Shock Resistance: 25g operational (vs. 30g for PLX31-EIP-MBS4/MVI56E-MCM; 25g for 3150-MCM), durable for industrial use[3]
- Additional Features: LED status indication, online diagnostics, fault query (PLX31-EIP-MBS4 has SD card backup; 3150-MCM/MVI56E-MCM have basic diagnostic functions)[3]
To sum up the key differences: The PLX31-EIP-SIE is a specialized SERCOS III interface module, compatible with GE RX3i controllers, focusing on high-precision multi-axis motion control; the PLX31-EIP-MBS4 is a standalone protocol conversion gateway, for EtherNet/IP-to-Modbus serial conversion and large-scale device connection; the 3150-MCM and MVI56E-MCM are Modbus communication modules, compatible with AB SLC and ControlLogix respectively, for simple serial communication. Choose based on your controller type, communication protocol, and whether you need motion control[3].



