Allen Bradley 1747-SCNR SLC 500 ControlLogix ControlNet Scanner Module

Product Overview

The Allen Bradley 1747-SCNR acts as a high-performance ControlNet network interface for the legacy SLC 500 controller platform. This module enables SLC 5/02, 5/03, 5/04, and 5/05 processors to scan remote I/O, coordinate peer-to-peer messaging, and exchange time-critical data with other controllers on a ControlNet network. By supporting both non-redundant and redundant media topologies, this card bridges the gap between legacy chassis designs and critical distributed plant infrastructure. We guarantee this unit arrives in 100% brand new, original factory-sealed condition.

Technical Specifications

Engineering Advantages

• High-Availability Redundant Media Networking: The dual onboard ControlNet ports (Port A and Port B) allow engineers to implement a fully redundant physical network path using 1786-RG6 coaxial cable. If a cable break occurs on one leg, the module seamlessly switches transmission lines without interrupting the active I/O scan or causing a CPU fault.

• Non-Volatile Flash Backup: The integrated Flash memory retains network configuration and scan-list routing tables during total system power losses. This local storage eliminates the need for external battery reliance and prevents the network layout from dropping when the main chassis loses its primary power feed.

• Flexible Slot Allocation: Field technicians can slide this standard width module into any open I/O slot across up to 30 logical chassis slots. This frees up specific slots near the CPU and allows the upgrade of existing SLC 500 racks without forcing a complete physical layout rewrite.

• deterministic High-Speed Remote I/O Scanning: The dedicated onboard processor unloads network management completely from the host SLC 5/0x CPU. It handles high-speed scheduling and diagnostic packets independently, ensuring predictable I/O update times even when managing dense, multi-rack distributed topographies.

FAQs

• Does this 1747-SCNR scanner module arrive in its original box?

  Yes. We ship this module as a 100% brand new, authentic factory product inside its original Rockwell Automation packaging. The package retains all standard corporate box seals, anti-static shielding, and printed documentation.

• What is the structural difference between the 1747-SCN and the 1747-SCNR?

  The "R" suffix designates redundant network media capability. The standard 1747-SCN provides only one physical network link, whereas the 1747-SCNR provides two ports to run parallel, backup coaxial lines for mission-critical installations.

• Can I place this module in the slot normally occupied by the CPU?

  No. You must install the primary SLC 5/0x processor in the leftmost slot (Slot 0) of the chassis. You can place the 1747-SCNR into any remaining available local slot to the right of the processor.

• Which network taps should I buy to connect this module to the coaxial cable trunk?

  The module interface mates directly with standard Allen Bradley T-taps. Use the 1786-TPR or 1786-TPS models for non-redundant runs, or select the 1786-TPYR or 1786-TPYS models to wire the network for redundant media configurations.