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Allen Bradley 1747-BSN Detailed Product Introduction and Technical Specifications
Product Overview
The Allen Bradley 1747-BSN is a Backup Scanner Module designed for the SLC 500 programmable controller platform. This module is mainly used in redundant PLC systems where continuous operation and backup communication are required.
The 1747-BSN allows two SLC 500 controllers to operate in a primary and secondary backup configuration. In the event of a processor failure, communication interruption, or system fault, the backup controller can automatically take over system operation, minimizing downtime and maintaining production continuity.
The module supports Remote I/O communication, high-speed synchronization, and serial communication switching, making it suitable for industrial environments requiring stable redundant control architecture.
The 1747-BSN is commonly used in industries such as petrochemical processing, power generation, automotive manufacturing, mining, water treatment, heavy machinery production, and large-scale factory automation systems.
Its robust industrial design, reliable communication performance, and fault-tolerant capability make it an important component in legacy SLC 500 redundancy systems.
Brand Information
| Item | Details |
|---|---|
| Brand | Allen Bradley |
| Product Model | 1747-BSN |
| Product Type | Backup Scanner Module |
| Product Family | PLC Communication and Redundancy Module |
| Series | SLC 500 Series |
| Main Function | Backup Communication and Processor Redundancy |
| Communication Support | Remote I/O / Serial Communication |
| Installation Type | Chassis Slot Installation |
Product Series Introduction
SLC 500 Series
The SLC 500 series is a modular PLC automation platform widely used in industrial control systems for medium-scale automation applications.
The series was developed to provide flexible I/O expansion, reliable processor communication, stable operation, and simplified maintenance capability.
The SLC 500 platform includes processors, digital modules, analog modules, communication adapters, scanner modules, power supplies, and redundancy communication modules.
The 1747-BSN belongs to the communication redundancy family within the SLC 500 platform and is specifically designed for fault-tolerant PLC architecture.
This module enables synchronized operation between primary and secondary PLC systems, improving system reliability and reducing production downtime in critical industrial environments.
Detailed Technical Specifications of 1747-BSN
Main Technical Parameters
| Parameter | Specification |
|---|---|
| Model | 1747-BSN |
| Module Type | Backup Scanner Module |
| Series | SLC 500 |
| Main Function | Redundant Communication and Backup Control |
| Communication Protocols | Remote I/O, Serial Communication |
| Supported Processors | SLC 5/02, SLC 5/03, SLC 5/04, SLC 5/05 |
| Backplane Current Consumption | 800 mA at 5V DC |
| Connector Type | 6-Pin Industrial Connector |
| Communication Channels | Dual Communication Support |
| Redundancy Function | Supported |
| Automatic Switchover | Supported |
| High-Speed Data Synchronization | Supported |
| Diagnostic Indicators | LED Status Indicators |
| DIP Switch Configuration | Supported |
| Operating Voltage | 5V DC |
| Isolation Method | Optical Isolation |
| Operating Temperature | 0°C to 60°C |
| Storage Temperature | -40°C to 85°C |
| Humidity Range | 5% to 95% Non-Condensing |
| Noise Immunity | Industrial Grade |
| Installation Method | Chassis Mounted |
| Certifications | UL / CSA / CE |
| Dimensions | 13.9 × 9.1 × 14.4 cm |
| Weight (kg) | 1.10 kg |
Product Features
1. Processor Redundancy Support
The primary purpose of the 1747-BSN is providing backup operation for SLC 500 PLC systems.
The module allows two processors to operate in a synchronized configuration where the secondary processor continuously monitors the primary processor.
If the primary controller fails, the backup controller automatically assumes operational control, helping maintain uninterrupted industrial production.
2. Reliable Remote I/O Communication
The module supports stable Remote I/O communication for distributed industrial systems.
This allows remote field devices and distributed I/O racks to remain operational even if communication problems occur within the primary control system.
The feature improves system reliability in large-scale automation environments.
3. High-Speed Data Synchronization
The 1747-BSN supports high-speed synchronization between primary and backup controllers.
Critical process data, memory information, and operational status are continuously transferred between controllers to ensure accurate backup operation.
This helps minimize operational disruption during automatic switchover events.
4. Automatic Failover Capability
One of the most important advantages of the module is automatic communication and processor switchover.
If the primary PLC experiences a fault condition, the backup processor can quickly assume control without requiring manual intervention.
This capability significantly reduces production downtime and improves process safety.
5. Industrial-Grade Durability
The module is designed for harsh industrial environments containing vibration, electrical noise, dust, and temperature fluctuations.
Its industrial-grade construction ensures long-term operational reliability under demanding manufacturing conditions.
Product Applications
Petrochemical Industry
Petrochemical processing systems require continuous operation and reliable automation control.
The 1747-BSN helps maintain uninterrupted communication and process stability during controller failures or maintenance activities.
Power Generation Systems
Power plants require redundant automation systems to ensure operational safety and stable power generation.
The module provides backup communication capability for critical turbine and auxiliary control systems.
Automotive Manufacturing
Automotive production lines rely on synchronized machine operation and continuous automation control.
The 1747-BSN supports fault-tolerant communication systems that help avoid unexpected production interruptions.
Water and Wastewater Treatment
Water treatment facilities require continuous pump control, valve operation, and monitoring system communication.
The module improves operational reliability in essential infrastructure applications.
Mining and Heavy Industry
Mining systems often operate continuously under harsh environmental conditions.
The module supports reliable backup communication for conveyor systems, crushers, and material handling equipment.
Product Advantages
| Advantage | Description |
|---|---|
| High Reliability | Automatic backup controller operation |
| Fault-Tolerant Design | Reduces production downtime |
| Stable Communication | Reliable Remote I/O communication |
| Fast Data Synchronization | Continuous backup processor updating |
| Industrial Durability | Suitable for harsh industrial environments |
| Easy Diagnostics | LED status indicators simplify maintenance |
| Flexible Integration | Compatible with SLC 500 systems |
| Improved Process Safety | Supports critical industrial applications |
Recommended Models from the Same Series or Related Series
Related SLC 500 Communication and Redundancy Modules
| Model | Product Type | Main Function | Communication Type | Dimensions | Weight (kg) |
|---|---|---|---|---|---|
| 1747-SN | Scanner Module | Remote I/O Scanning | Remote I/O | 24 × 13 × 7 cm | 1.80 kg |
| 1747-ASB | Remote I/O Adapter | Distributed Rack Communication | Remote I/O | 14.5 × 13.1 × 3.5 cm | 0.168 kg |
| 1747-ACNR15 | Redundant Adapter Module | Redundant ControlNet Communication | ControlNet | 26.3 × 13.8 × 8.8 cm | 2.35 kg |
| 1747-DCM | Direct Communication Module | PLC Peer Communication | DH485 / RS232 | 25 × 14 × 7 cm | 1.90 kg |
| 1747-KE | Communication Interface Module | DH-485 Communication | DH-485 | 22 × 12 × 6 cm | 1.10 kg |
Recommended Popular Models from the Same Brand
Popular Industrial Automation Products
| Model | Product Category | Main Features | Application Area | Dimensions | Weight (kg) |
|---|---|---|---|---|---|
| 1756-EN2TR | Ethernet Communication Module | Dual Ethernet/IP Ports | Industrial Networking | 14 × 11 × 8 cm | 0.45 kg |
| 1769-L33ER | Compact PLC Controller | Integrated Ethernet Communication | Machine Automation | 18 × 12 × 9 cm | 0.92 kg |
| 1756-IB16 | Digital Input Module | 16-Point Digital Input | Factory Automation | 15 × 11 × 6 cm | 0.30 kg |
| 1769-IF8 | Analog Input Module | 8-Channel Analog Input | Process Control | 12 × 9 × 5 cm | 0.35 kg |
| 1783-US8T | Industrial Ethernet Switch | Managed Ethernet Switching | Industrial Networks | 16 × 12 × 5 cm | 0.80 kg |
Communication and Redundancy Architecture
The 1747-BSN was developed to provide a reliable backup communication solution for industrial automation systems requiring continuous operation.
The module allows two independent SLC 500 processors to operate together within a redundant architecture.
The backup processor continuously monitors the primary controller while maintaining synchronized process information.
If the primary processor fails, the backup processor automatically assumes system control, helping maintain uninterrupted industrial operation.
This architecture significantly improves operational reliability in critical manufacturing and process industries.
Installation and Maintenance Characteristics
The module is installed directly into a compatible SLC 500 chassis.
Front-panel status indicators provide operational and communication status information for maintenance personnel.
The diagnostic indicators simplify troubleshooting and reduce maintenance time during system inspections.
The module’s industrial-grade electronic design minimizes routine maintenance requirements and supports long-term stable operation.
Industrial Reliability
The 1747-BSN became widely recognized for providing one of the early practical redundancy solutions within SLC 500 automation systems.
Its durable construction and stable communication capability allowed industrial facilities to maintain reliable operation for many years under demanding conditions.
Many manufacturing plants and process industries continue to operate systems using this module because of its proven long-term reliability and dependable redundancy performance.
Summary
The Allen Bradley 1747-BSN is a highly reliable Backup Scanner Module developed for redundant SLC 500 automation systems.
Its automatic failover capability, stable communication performance, processor synchronization function, and industrial durability make it an important component in critical industrial automation applications.
The module remains widely respected for its role in improving system reliability, reducing downtime, and supporting fault-tolerant industrial control architecture.
For facilities operating legacy SLC 500 systems, the 1747-BSN continues to provide dependable backup communication and redundancy support for continuous industrial operation.