The Allen‑Bradley 1747‑L551 is a SLC 500 SLC 5/05 processor, widely deployed in factory automation, process control, material handling, packaging machinery and legacy PLC retrofit projects. As the core controller of the SLC 500 series rack‑based system, it brings together Ethernet connectivity, serial communication and reliable ladder logic execution for discrete and light process control applications. This unit supports distributed I/O, peer‑to‑peer messaging and connection with HMIs, variable frequency drives, sensors and other automation devices.

Key Specifications

• Part Number: 1747‑L551
• Manufacturer: Allen‑Bradley (Rockwell Automation)
• Series: SLC 500, SLC 5/05 Processor
• User Memory: 16K words
• Communication Ports: 10/100 Mbps Ethernet port, RS‑232 DH‑485 serial port
• Supported Networks: EtherNet/IP, DH‑485
• Backplane Compatibility: Works with SLC 500 rack, compatible with SLC discrete, analog and specialty I/O modules
• Programming Software: RSLogix 500
• Operating Voltage: 24 V DC backplane power supply
• Operating Temperature: 0 °C to +60 °C
• Storage Temperature: -40 °C to +85 °C
• Shock and Vibration: Designed to meet industrial vibration and shock standards for factory floor environments
• Enclosure Rating: Requires installation inside an industrial control cabinet
• Mounting: Rack mount, fits standard SLC 500 chassis

Communication Features

The 1747‑L551 stands out among SLC processors with its built‑in Ethernet port. It enables direct EtherNet/IP communication without separate communication adapters. Engineers can upload, download and monitor PLC programs over the plant LAN, connect to PanelView HMIs, exchange data with other SLC controllers and send production data to SCADA systems. The RS‑232 / DH‑485 port serves local programming, serial device connection and legacy network integration. It supports message instructions for data sharing between controllers and flexible serial communication with older instruments.

Application Scenarios

This Allen‑Bradley SLC 5/05 controller is a common choice for retrofitting and maintaining existing automation lines. Typical use cases include conveyor control systems, automatic packaging lines, material sorting equipment, water and wastewater treatment skids, small batch process stations, metal processing machinery and custom machine builds that rely on the SLC 500 platform. Many system integrators and maintenance teams keep 1747‑L551 in stock as a spare replacement for end‑of‑life SLC installations.

Compatibility

The 1747‑L551 operates within the SLC 500 chassis ecosystem. It pairs with SLC discrete input and output modules, analog I/O, high‑speed counter modules, thermocouple and RTD modules. It works alongside Allen‑Bradley HMIs, power supplies and rack accessories for a complete control system. When replacing an older SLC processor, confirm chassis type, available memory requirements and communication network layout to guarantee seamless migration.

Product Condition & Supply Note

We supply tested 1747‑L551 units. Every controller goes through power‑on testing, communication port verification and memory check before shipment. For legacy Rockwell spare parts, availability can fluctuate quickly. If you need bulk quantity, please send us your inquiry with target quantity and delivery deadline. We can also support combined orders with other SLC 500 series modules.

Frequently Asked Questions

Q: What software do I use to program 1747‑L551? A: RSLogix 500 is the official programming software for this SLC 5/05 processor.

Q: Does 1747‑L551 have Ethernet? A: Yes, the 1747‑L551 includes an integrated EtherNet/IP port plus DH‑485 serial port.

Q: What is the memory size of 1747‑L551? A: This model provides 16K user memory for ladder logic, data tables and program files.

Q: Can I use this for replacement on an old SLC rack? A: Yes, it is a direct SLC 5/05 processor replacement, please verify your chassis and power supply compatibility first.

Why Choose Us for 1747‑L551

We specialize in industrial automation spare parts including Allen‑Bradley SLC 500 series PLC processors and I/O modules. Our focus is on tested, verified control components for factory maintenance and machine retrofit. Fast quotation, clear photos, professional packing and reliable shipping are our priorities for international buyers. If you require datasheet, pinout, wiring diagram or further technical details for 1747‑L551, feel free to send your request.

1747-L551