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Key Technical Specifications
| Parameter | Value |
|---|---|
| Catalog Number | SST-ESR2-CLX-RLL (also 112073-0001) |
| Product Family | Brad SST ESR2 In-Chassis Communication Module |
| Compatible Controller | Rockwell ControlLogix (1756 backplane) |
| Ethernet Port | 1 × 10/100 Mbps, auto-negotiation, RJ45 |
| Ethernet Protocols | Modbus TCP (client/server), Siemens Industrial Ethernet (S5/S7 client/server) |
| Serial Ports | 2 × RS-232/485 (software selectable), DB9 male |
| Serial Protocols | Modbus RTU/ASCII (client/server), Siemens S5/S7 serial |
| Serial Speed | 110–115,200 bps |
| Isolation | 500 V galvanic isolation (serial to backplane) |
| I/O Mode | Direct mode: 248 words input + 248 words output (no ladder) |
| Paging Mode | Up to 32,000 words I/O (via paging) |
| Database Access | Direct access to 30,720 words from backplane via AOI |
| Processor | Freescale PowerPC |
| Memory | 16 MB local FPGA RAM; 124 MB onboard PPC memory; 8 MB flash; 2 MB serial flash |
| Backplane Current | 850 mA @ 5 V DC; 1.75 mA @ 24 V DC |
| Operating Temperature | 0 to 60 °C (32 to 140 °F) |
| Storage Temperature | −40 to 85 °C (−40 to 185 °F) |
| Humidity | 5–95% non-condensing |
| MTBF | 56 years (Telecordia SR332, Issue 1) |
| USB Port | 1 × USB Type A (2.0/1.1) for console access |
| Software | RSLogix 5000 Add-On Profile (AOP); Add-On Instruction (AOI); Console software |
| Dimensions (W × H × D) | ~22 × 102 × 115 mm (0.87 × 4.0 × 4.5 in) |
| Weight | ~0.23 kg (0.5 lb) |
| Certifications | UL, CE, CSA; RoHS II compliant |
Product Introduction
The Molex SST-ESR2-CLX-RLL is a Brad SST in-chassis communication module for Rockwell ControlLogix. It provides one 10/100 Mbps Ethernet port and two RS-232/485 serial ports for integrating Modbus TCP, Modbus RTU, and Siemens S5/S7 devices into a ControlLogix system.
This module is chosen for applications where a single ControlLogix chassis must interface with multiple non-Rockwell protocols without adding external gateways. In field deployments, it’s commonly used on packaging lines, process skids, and machine cells where Modbus and Siemens PLCs must exchange data with a ControlLogix controller.
SST-ESR2-CLX-RLL
SST-ESR2-CLX-RLL
Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to this Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| Module not detected in RSLogix | Backplane communication fault or module not seated | ✅ High | Check module status LED; verify 1756 backplane slot; reseat module | Reseat module; try different slot; verify chassis power |
| No communication on Ethernet port | IP config mismatch or cable/switch issue | ✅ High | Ping module IP; check Ethernet LED; verify subnet/gateway | Correct IP settings; replace Ethernet cable; check switch port |
| No communication on serial port | Baud/parity mismatch or wiring fault | ✅ High | Verify baud, parity, data bits; check RS-232/485 wiring | Correct serial config; verify wiring (TX/RX, A/B) |
| Modbus TCP timeouts | Server not responding or firewall blocking | ✅ Medium | Test with Modbus client tool; check firewall rules | Adjust firewall; verify Modbus server IP/port |
| Data not updating in ControlLogix | AOI not configured or I/O mapping error | ✅ High | Check AOI configuration; verify I/O tags in RSLogix | Reconfigure AOI; verify I/O mapping and update rates |
| Module runs hot or resets | Overload or poor ventilation | ✅ Medium | Measure module temperature; check enclosure airflow | Improve cooling; verify load within specs |
If you’re stuck, send photos of the module (including LEDs), a screenshot of your RSLogix configuration, and your network/serial settings. We’ll review it before you swap the module.
Frequently Asked Questions (FAQ)
Q: Is the SST-ESR2-CLX-RLL hot-swappable?
A: No. The SST-ESR2-CLX-RLL must be installed and removed with ControlLogix chassis power OFF. Hot-swapping can damage the backplane and module.
Q: What’s the difference between SST-ESR2-CLX-RLL and SST-ESR2-CLXT-RLL?
A: ESR2-CLX-RLL is for standard ControlLogix (0–60 °C). ESR2-CLXT-RLL is for ControlLogix XT (extended temperature, −40–70 °C). Choose based on your environmental requirements.
Q: Can I use the SST- with CompactLogix?
is designed for 1756 ControlLogix backplanes only. For CompactLogix, use the SST-ESR2-CCL-RLL variant.
Q: What software do I need to co?
A: RSLogix 5000 with the Add-On Profile (AOP) and Add-On Instruction (AOI) for the module. Molex Console software is used for advanced configuration and diagnostics.
Q: What condition are these modules in, and why is pricing lower than factory?
A: We sell New Original (New Surplus) and Refurbished (tested) units. Pricing is lower because these are surplus or professionally refurbished, and the Molex SST line is discontinued. Each refurbished unit goes through live functional testing and comes with a 1-year warranty.
Q: Can I keep my existing program when swappi?
A: Yes, if the replacement is the same catalog number and you have a backup of the RSLogix project and AOI configuration. Re-download the project and verify I/O mapping and network settings.
Q: What is the recommended replacem?
A: ProSoft MVI56E-MCM (or MVI56E-MCMXT for extended temperature) is the recommended replacement. Migration requires updating the RSLogix project to use the ProSoft AOP/AOI and reconfiguring network/serial settings.
