Allen-Bradley 1747-BSN SLC 500 Backup Scanner Module

Product Overview

The Allen-Bradley 1747-BSN serves as the critical hardware interface for creating redundant controller systems within the SLC 500 platform. This Backup Scanner Module enables a high-availability "hot-backup" configuration, allowing a secondary processor to take control of Remote I/O and DH+ networks if the primary controller fails. We provide this module as 100% Brand New and Original, ensuring your critical infrastructure maintains maximum uptime without the risks associated with used legacy hardware.

Technical Specifications

Engineering Advantages

• High-Speed Fault Detection: The 1747-BSN continuously monitors the health of the primary SLC processor. Upon detecting a processor fault or power loss, the module initiates a high-speed switchover to the backup rack, maintaining control over the Remote I/O network with minimal interruption to the process.

• Network Integrity Maintenance: By utilizing the standard Belden 9463 "Blue Hose" cable, the 1747-BSN bridges the communication gap between primary and secondary chassis. It synchronizes data across Data Highway Plus (DH+) and Remote I/O links, ensuring the standby controller possesses the most recent process variables.

• Simplified Redundancy Architecture: This module eliminates the need for complex, third-party failover hardware. It integrates directly into the standard 1746 chassis, allowing engineers to implement redundancy for critical SLC 5/04 or 5/05 systems using native Allen-Bradley protocols.

• Secure Industrial Terminations: The 6-pin Phoenix connector provides a vibration-resistant interface for communication wiring. This termination style prevents accidental disconnects in high-vibration manufacturing environments, such as automotive assembly or material handling lines.

FAQs

• Which processors can I use with the 1747-BSN?

  The 1747-BSN supports SLC 5/02, 5/03, 5/04, and 5/05 processors. To ensure a successful switchover, you must use identical processors and memory configurations in both the primary and backup chassis.

• Does this module require a specific slot in the 1746 chassis?

  While you can technically place the module in any available I/O slot, engineers typically position the 1747-BSN in the first slot following the processor to optimize backplane communication speed and cable management within the cabinet.

• Is this a Brand New original product or a "pull"?

  We guarantee this unit is 100% Brand New and Original. Because the 1747-BSN manages critical system failover, using used or refurbished modules introduces unacceptable risk. Our stock ensures factory-fresh components for maximum reliability.

• What happens to the outputs during a switchover?

  The 1747-BSN manages the Remote I/O link to ensure that outputs maintain their state or transition to a programmed safe state during the switchover. The exact behavior depends on your Remote I/O adapter settings and the switchover timing configured in the backup scanner's setup.