Allen-Bradley | 1747-L551 | SLC 5/05 | Processor Module

Product Description

The Allen-Bradley 1747-L551 is a processor module from the SLC 5/05 family, designed for mid-range PLC applications requiring Ethernet connectivity and reliable memory management. It supports extensive digital and analog I/O, making it suitable for distributed control systems.

Technical Specifications

• Manufacturer: Allen-Bradley

• Category: PLCs

• Product Line: SLC 500

• Part Number: 1747-L551

• Weight: 0.56 lbs (0.26 kg)

• Module Type: SLC 5/05 Processor

• Inputs: 4096

• Outputs: 4096

• Analog I/O Capacity: 480

• User Memory: 16,000 words (battery-backed RAM)

• Program Scan Time: 0.9 ms per K

• I/O Scan Time: 0.225 ms

• I/O Chassis Supported: Up to 3

• Chassis Module Slots: 30

• Communication Interfaces: Ethernet and RS-232

• Backup Memory Module: 1747-M13

• Battery Backup: Yes, compatible with 1747-BA

• Operating Temperature Range: 0–60 °C

• Shock Rating: 30G

Application Scenarios

• Distributed Control Systems: Supports large-scale I/O for manufacturing and process automation

• Legacy Installations: Commonly used in SLC 500 systems requiring Ethernet connectivity

• Industrial Environments: Reliable operation under shock and temperature variations

FAQ

• Q: How much user memory does the 1747-L551 provide?  A: It offers 16,000 words of battery-backed RAM.

• Q: What communication ports are available?  A: Ethernet and RS-232 interfaces are built in.

• Q: Is backup memory supported?  A: Yes, via the 1747-M13 memory module.

• Q: How does this compare to the 1747-L552?  A: The 1747-L552 provides larger memory capacity, making it more suitable for complex applications.