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  2. sku: 22067976470578603
  3. BRAD COMMUNICATIONS MOLEX SST-ESR2-CPX-P

BRAD COMMUNICATIONS / MOLEX SST-ESR2-CPX-P Modbus Enet Serial/enet Module Compactlogix

Sst-esr2-cpx-p Brad Communications / Molex Lot Of 2 Plus Modbus Serial/enet Module For Compactlogix

( Brand: Brad Communications / Molex ), ( Manufacturer Part Number: SST-ESR2-CPX-P ), ( Type: Communications Module ), ( Communication Standard: Modbus ), ( Controller Platform: Compactlogix )

Review BRAD COMMUNICATIONS / MOLEX Lot Of Plus Modbus Serial/enet Module Compactlogix

The **Brad Communications Molex SST-ESR2-CPX-P Modbus Serial/Ethernet Module** is a high-performance, versatile communication interface designed specifically for integration with Allen-Bradley CompactLogix controllers, enabling seamless connectivity between industrial automation systems and a wide range of field devices, SCADA platforms, or enterprise networks. This rugged, compact module combines dual communication protocols Modbus RTU/ASCII over serial (RS-485) and Modbus TCP/IP over Ethernet into a single, space-efficient solution, eliminating the need for multiple discrete modules and streamlining cabinet design. Built with Molex s robust SST (Serial-to-Serial Translator) architecture, the SST-ESR2-CPX-P delivers reliable, high-speed data exchange with minimal latency, making it ideal for applications requiring real-time monitoring, remote diagnostics, or distributed control systems. The module features a dual-port design, allowing simultaneous connections to both the CompactLogix controller via its built-in Ethernet port and external devices through a dedicated serial or Ethernet interface, depending on the application. Its modular construction ensures easy installation and replacement, while the inclusion of advanced features such as configurable baud rates, parity settings, and Modbus slave/master functionality provides unparalleled flexibility for integrating legacy systems alongside modern networks. With support for both Modbus variants, the SST-ESR2-CPX-P bridges the gap between PLCs, HMIs, and third-party devices, ensuring compatibility with a vast array of industrial protocols and communication standards. Additionally, its compliance with strict industrial standards including wide operating temperature ranges, high immunity to electrical noise, and robust physical protection makes it a dependable choice for harsh environments such as manufacturing plants, oil and gas facilities, or water treatment systems. Whether used for data acquisition, remote asset management, or system integration, this module enhances the scalability and efficiency of CompactLogix-based automation solutions while reducing wiring complexity and maintenance overhead.

### **Pros and Cons of buying a Brad Communications Molex SST-ESR2-CPX-P (Modbus Serial/Ethernet Module for CompactLogix)**

#### **Pros**

1. **Compatibility with CompactLogix Controllers** The module is specifically designed for use with Allen-Bradley CompactLogix PLCs, ensuring seamless integration without additional configuration issues.

2. **Dual Communication Protocols (Modbus RTU and Ethernet)** Supports both serial (Modbus RTU) and Ethernet (Modbus TCP) communication, providing flexibility in network setups. This allows for easy migration from legacy serial devices to modern Ethernet-based systems.

3. **High-Speed Data Transfer** Ethernet communication offers faster data rates compared to serial, improving overall system responsiveness and reducing latency in real-time applications.

4. **Modbus Compatibility** Since Modbus is a widely supported industrial protocol, this module can interface with a broad range of third-party devices, sensors, and SCADA systems without requiring proprietary software.

5. **Reliable and Industrial-Grade Construction** Brad Communications modules are built to withstand harsh industrial environments, including temperature fluctuations, electrical noise, and vibration.

6. **Easy Installation and Configuration** The module plugs directly into the CompactLogix backplane, simplifying hardware integration. Configuration via Allen-Bradley Studio 5000 or RSLogix 5000 is straightforward, with built-in support for Modbus addressing and baud rate settings.

7. **Cost-Effective Alternative to Native Ethernet Modules** While CompactLogix controllers have built-in Ethernet ports, adding a dedicated Modbus module can be more economical than upgrading to a higher-end controller with expanded communication capabilities.

8. **Supports Remote I/O and SCADA Integration** Ideal for applications requiring remote monitoring, control, or integration with enterprise-level SCADA systems (e.g., Siemens, Wonderware, or Ignition).

9. **Backward Compatibility** If your system already uses Modbus RTU (serial), this module allows you to gradually transition to Ethernet without rewiring existing devices.

10. **Vendor Support and Documentation** Brad Communications provides technical support, datasheets, and example code, reducing troubleshooting time for engineers.

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#### **Cons**

1. **Limited to Modbus Protocol** If your application requires other industrial protocols (e.g., PROFINET, CIP, or DeviceNet), this module will not be compatible, necessitating additional hardware.

2. **Additional Cost for Dual Protocols** While the module supports both Modbus RTU and TCP, purchasing it may be more expensive than a single-protocol module if only one interface is needed.

3. **Dependence on CompactLogix Backplane** The module must be installed in a CompactLogix controller, meaning it cannot be used with other Allen-Bradley platforms (e.g., ControlLogix or SLC 500) without additional hardware.

4. **Potential Latency in Serial Mode** Modbus RTU over serial is inherently slower than Ethernet, which could be a limitation in high-speed control applications where millisecond response times are critical.

5. **Firmware or Driver Updates May Be Required** Like all industrial communication modules, periodic firmware updates may be needed to ensure compatibility with new software versions or security patches.

6. **Physical Space Constraints** The module occupies a slot in the CompactLogix backplane, which may limit the number of available I/O or communication slots in smaller controllers.

7. **Learning Curve for Modbus Configuration** While straightforward, configuring Modbus addressing (slave ID, baud rate, parity, etc.) requires familiarity with the protocol, which may be unfamiliar to some engineers.

8. **Potential for IP Address Conflicts in Ethernet Mode** If multiple devices share the same network, improper IP configuration could lead to communication errors, requiring careful network planning.

9. **No Built-in Security Features** Unlike some modern Ethernet modules, this module does not include built-in encryption or authentication, which could be a concern in unsecured industrial networks.

10. **Deprecation Risk** While Brad Communications remains a reputable supplier, Allen-Bradley (now part of Rockwell Automation) may eventually phase out support for certain legacy modules, though this is unlikely for widely used products like this one.

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### **Conclusion**

The **Brad Communications Molex SST-ESR2-CPX-P** is a robust and versatile module for CompactLogix controllers, offering dual Modbus communication (serial and Ethernet) with strong industrial reliability. It is particularly well-suited for applications requiring **Modbus compatibility, ease of integration, and flexibility in network setups**. The module excels in scenarios where **backward compatibility with serial devices is needed alongside modern Ethernet connectivity**, such as in SCADA systems, remote monitoring, or legacy system upgrades.

However, it is not ideal for applications requiring **non-Modbus protocols, high-speed control without Ethernet, or advanced security features**. Engineers should carefully assess their communication needs before purchasing, ensuring that the module aligns with their protocol requirements and network architecture.

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### **Recommendation**

**Buy the Brad Communications Molex SST-ESR2-CPX-P if:**

- You are using a **CompactLogix controller** and need **Modbus RTU and TCP communication**.

- Your application involves **third-party Modbus devices, SCADA integration, or remote I/O**.

- You require a **cost-effective solution** that avoids upgrading to a higher-end controller.

- You operate in an **industrial environment** where reliability and dual-protocol support are critical.

**Avoid or Consider Alternatives if:**

- Your system requires **non-Modbus protocols** (e.g., PROFINET, CIP, or DeviceNet). In this case, consider Rockwell s **1756-EN2T** (Ethernet module) or a third-party **Modbus-to-Ethernet gateway**.

- You need **high-speed control** with minimal latency, as Ethernet will still be slower than native CIP-based communication.

- Your network lacks **IP management tools**, as improper Ethernet configuration could cause issues.

- You prioritize **built-in security features**, in which case a newer Ethernet module with encryption support may be preferable.

**Final Verdict:** For most **CompactLogix-based Modbus applications**, this module is a **strong, practical choice** that balances cost, compatibility, and performance. Ensure your network and software stack are properly configured to maximize its benefits.

Details:

Lot of two 2 Brad Communications Molex SST-ESR2-CPX-P PLUS Modbus Serial/Ethernet Modules for CompactLogix 1769 series PCs. These work similar to Pro soft MVI69-MCM or MVI69-MNET modules, except these can do both Ethernet and Serial Communications in the same card. Both are known good, pulled from working environments, and in great physical condition one has writing on it, the other minor scuffs one side.

part #: sstesr2cpx price

  • $1100.00

specifications sensoindustria:

  • brand: Brad Communications / Molex
  • mpn: Sst-esr2-cpx-p
  • type: Communications Module
  • communication standard: Modbus
  • controller platform: Compactlogix

returns sensoindustria:

  • policy: No Returns

offer sensoindustria:

  • availability: In Stock
  • sold: 0
  • quantity: 1
  • options: Ship-to-home
  • best offers: True
  • started: April 11, 2026

payments sensoindustria:

  • other
  • wallet: Google-pay
  • credit card: Diners-club

seller sensoindustria:

  • # reviews: 206
  • rating: 100.0%
  • city: Mandeville, Louisiana

shipping sensoindustria:

  • type: Calculated
  • transit: 9-13 Days
  • carrier: UPS
  • class: Economy
  • cost: $24.33
  • service: UPS Ground Saver

general sensoindustria:

  • PLCs HMIs > PLC Peripheral Modules > PLC Input Output Modules
  • condition: Used
type: communications module, communication standard: modbus, controller platform: compactlogix,
category: business & industrial > plcs hmis > plc peripheral modules > plc input output modules, sku: 22067976470578603,
Brad Communications / Molex SST-ESR2-CPX Is Similar To:
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1 offer $1100.00 USD
  • Used. Offer #1 priced at $1100.00 + $24.33 shipping estimate = $1124.33* total. These work similar to Prosoft MVI69-MCM or MVI69-MNET modules, except these can do both Ethernet and Serial communications in the same card. Lot of two (2) Brad Communications Molex -P PLUS Modbus Serial/Ethernet Modules for CompactLogix 1769 series PLCs.+$24.33 shipping

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