Molex SST‑SR4‑CLX‑RLL | ControlLogix Serial Communication Module

Product Description

The Molex SST‑SR4‑CLX‑RLL is a specialized communication module designed to bridge Allen-Bradley ControlLogix controllers with legacy Honeywell IPC 620 or Modbus serial I/O networks. This high-performance module functions as a gateway or scanner, allowing modern PLC systems to interface directly with existing distributed I/O racks without rewiring, saving time and reducing retrofit costs.

Engineered for industrial reliability, the SST‑SR4‑CLX‑RLL supports multiple serial communication standards and ensures fast, accurate data transfer between diverse control systems.

Key Features

• Legacy System Integration: Acts as a scanner for Honeywell IPC 620 racks, enabling modern ControlLogix systems to manage legacy I/O.

• Multi-Protocol Support: Compatible with Modbus RTU and ASCII in both Master and Slave configurations.

• Four Independent Channels: Each channel supports RS‑232 or RS‑485 communication with speeds from 110 bps to 115,200 bps.

• Direct and Paging Modes: I/O capacity up to 496 bytes in direct mode and up to 32,000 words in paging mode.

• Plug-and-Play Configuration: Easily mounts in a single ControlLogix rack slot and draws power from the backplane.

• Robust Industrial Design: Provides 500 V galvanic isolation between channels to protect the controller from electrical surges.

• Diagnostics and Status Monitoring: Front-panel LEDs display power, activity, and fault conditions for simplified troubleshooting.

• Software Mapping Tools: Compatible with configuration utilities to map legacy I/O points to ControlLogix tags.

Technical Specifications

Application Scenarios

The SST‑SR4‑CLX‑RLL is ideal for facilities migrating from Honeywell IPC 620 or Modbus serial networks to modern Rockwell Automation architectures. It eliminates the need for expensive field rewiring while maintaining full operational control over existing I/O racks. Common applications include process control plants, chemical facilities, and legacy manufacturing installations where hybrid PLC networks must coexist.

FAQ

Q: How many I/O channels does the SST‑SR4‑CLX‑RLL support?
A: The module provides four independent serial communication channels.

Q: Can it connect to both Modbus and Honeywell IPC 620 I/O networks?
A: Yes, it supports Modbus RTU/ASCII and acts as a scanner for Honeywell IPC 620 remote I/O.

Q: What electrical interfaces are available?
A: Each channel supports RS‑232 and RS‑485 interfaces.

Q: Is the module protected from electrical surges?
A: Yes, it provides 500 V galvanic isolation between channels.

Q: How is the module powered?
A: Power is supplied via the ControlLogix backplane (5–24 VDC).