Allen-Bradley 1747-L531 SLC 5/03 Processor | 8K Memory, DH-485, 24V DC, 30 I/O Max Specs

Allen-Bradley 1747-L531 SLC 5/03 Processor | 8K Memory, DH-485, 24V DC, 30 I/O Max Specs

Allen-Bradley 1747-L531 SLC 5/03 processor specifications. 8K memory, DH-485 communication, 24V DC power, 30 I/O maximum. For industrial automation and control.

Product Overview

The Allen-Bradley 1747-L531​ is a SLC 5/03 programmable logic controller (PLC)​ processor from the SLC 500 series, designed for industrial automation and control applications. This processor features 8K words of user memory, DH-485 communication protocol, and operates on 24V DC power. The "1747" designation indicates the SLC 500 processor series, "L531" specifies the 5/03 series with 8K memory and DH-485 communication. This controller provides reliable logic control for small to medium automation applications, with integrated communication capabilities for programming, monitoring, and networking.

Technical Specifications

Note: Specifications are based on Allen-Bradley 1747 series technical documentation. The "1747-L531" model specifically indicates SLC 5/03 processor with 8K memory and DH-485 communication. Actual specifications may vary slightly depending on production batch.

Model Number Decoding (1747-L531)

• 1747:​ Series designation (SLC 500 processor series)

• L531:​ Processor model (L5 = SLC 5/03 series, 31 = 8K memory with DH-485)

Note:​ The "L5" prefix indicates SLC 5/03 processor family. The "31" suffix specifies 8K memory configuration with DH-485 communication. This processor requires a 1746 power supply and chassis for operation.

Key Features

• 8K User Memory:​ 8,192 16-bit words for program and data storage

• DH-485 Communication:​ Built-in DH-485 network communication

• Dual RS-232 Ports:​ Two communication ports for programming and networking

• Real-Time Control:​ Deterministic scan time for predictable control

• Battery Backup:​ Maintains memory during power loss

• Status Indicators:​ Comprehensive LED status indication

• Key Switch:​ Three-position key switch for mode control

• Expandable I/O:​ Supports up to 30 local I/O (960 with expansion chassis)

• Instruction Set:​ 72 instructions including math, logical, and file operations

• Industrial Grade:​ Designed for harsh industrial environments

• Compact Design:​ Single-slot processor for space-efficient installation

Memory Configuration

Typical Applications

• Machine Control:​ Standalone machine automation and sequencing

• Process Control:​ Small to medium process automation

• Material Handling:​ Conveyor control and sorting systems

• Packaging Machinery:​ Filling, sealing, and labeling equipment

• HVAC Control:​ Building automation and environmental control

• Water Treatment:​ Pump control and process monitoring

• Manufacturing:​ Production line control

• Test Equipment:​ Automated test system control

• Energy Management:​ Power monitoring and control

Important Technical Notes

1. System Requirements:​ Requires 1746 chassis (A4, A7, A10, A13) and 1746 power supply. Must be installed in slot 0.

2. Memory Limitations:​ 8K memory is fixed and cannot be expanded. Consider memory requirements for complex applications.

3. Communication Setup:​ DH-485 network requires proper termination and addressing. Maximum 32 nodes on network.

4. Battery Maintenance:​ Replace lithium battery (1747-BA) every 2 years or when battery LED indicates low voltage.

5. Programming Software:​ Requires RSLogix 500 software for programming and configuration.

6. I/O Expansion:​ Local I/O limited to 30 modules. Remote I/O via 1747-ASB module expands to 960 I/O points.

7. Power Requirements:​ Ensure power supply provides adequate current for processor and I/O modules.

8. Environmental Conditions:​ Install in appropriate enclosure for protection. Operating temperature limited to 0-60°C.

9. Communication Ports:​ Port 0 is RS-232 programming port. Port 1 is DH-485 network port. Cabling and configuration must match port specifications.

Note: For complete installation guidelines, wiring diagrams, programming instructions, and detailed technical data, consult the official Allen-Bradley SLC 500 Technical Manual. Always verify the exact model number configuration with the manufacturer, as notation variations may occur.