Allen-Bradley 1746-SN SLC 500 Remote I/O Scanner Sub-Scanner Module

Product Overview

The 1746-SN serves as a high-performance Remote I/O (RIO) Scanner module for the Allen-Bradley SLC 500 platform. This module enables SLC 5/01, 5/02, 5/03, 5/04, and 5/05 processors to communicate with distributed I/O devices over a RIO link. It functions as a sub-scanner, managing data exchange between the local processor and remote racks, specialized adapters, or operator interfaces. We provide this unit as 100% Brand New and factory-original, ensuring total compatibility with your legacy control architecture and providing the high-speed data throughput required for modernized production lines.

Technical Specifications

The 1746-SN utilizes a compact, chassis-based design to deliver deterministic communication across the industrial network.

Engineering Advantages

• Deterministic Remote Networking: The 1746-SN manages distributed I/O racks at distances far exceeding standard backplane limits. It synchronizes data across the RIO link, ensuring time-critical inputs and outputs reach the processor within a predictable scan window.

• Memory Overhead Relief: The integrated 32 KB expansion memory offloads communication-related data tables from the main processor. This architecture allows the SLC CPU to dedicate more resources to complex logic execution and math instructions.

• Seamless Chassis Integration: The module plugs directly into any available I/O slot in a 1746 chassis. It draws power directly from the backplane, eliminating the need for external power supplies or complex 24V DC field wiring for the communication logic.

• Rugged Thermal Resilience: Engineered for harsh industrial environments, the module sustains continuous operation at temperatures up to 60°C (140°F). The robust internal circuitry resists electrical noise and interference common in motor control centers and high-voltage panels.

FAQs

• Does the 1746-SN require special software for configuration?

  You configure the 1746-SN using standard RSLogix 500 software. The module appears in the I/O configuration tree, allowing you to map remote racks and G-file data tables directly to the SLC processor's memory.

• Can I use multiple 1746-SN modules in a single chassis?

  Yes. Depending on the power supply capacity of your SLC 1746 chassis and the processor's addressing limits, you can install multiple scanners to manage separate RIO links, effectively expanding your total I/O count.

• How do I address a communication failure on the RIO link?

  The 1746-SN provides diagnostic LEDs on the front panel. A steady green light indicates active communication, while flashing or red indicators signify link errors or hardware faults. Always verify the 150-ohm terminating resistors at both ends of the "blue hose" cable to ensure signal integrity.

• Is this unit a used or refurbished pull?

  No. We guarantee this 1746-SN is 100% Brand New in its original factory packaging. This ensures the unit has never experienced the thermal stress or electrical wear typical of "surplus" or used components.