Allen-Bradley 1747-L551 SLC 500 SLC 5/05 Processor Module

Product Overview

The Allen-Bradley 1747-L551 represents the high-performance tier of the SLC 500 platform, specifically featuring the SLC 5/05 CPU architecture. This processor bridges the gap between legacy chassis-based control and modern industrial Ethernet networks, allowing for high-speed data exchange and remote programming capabilities. We supply this unit as 100% Brand New and Original, providing a critical lifecycle solution for maintaining high-density 1746 I/O systems with contemporary networking requirements.

Technical Specifications

Engineering Advantages

• Native Ethernet Integration: The 1747-L551 features an on-board 10/100 Mbps Ethernet port. This allows the processor to communicate directly with HMIs, SCADA systems, and other controllers over standard TCP/IP protocols without requiring expensive external bridge modules or gateways.

• Rapid Instruction Execution: With a typical scan time of 0.9 ms per K, this CPU handles complex logic and math instructions with minimal latency. It executes 107 distinct programming instructions, including advanced PID control and bit-shift operations, ensuring precise control over high-speed process loops.

• High-Density Scalability: The module manages up to 8,192 digital I/O points across a maximum of 3 chassis and 30 slots. This scalability makes it the ideal anchor for large-scale manufacturing lines that require centralized control over hundreds of discrete sensors and actuators.

• Flexible Program Storage: In addition to the internal 16K RAM, the processor supports optional flash EEPROM modules. This feature protects your critical logic against power failure and allows for hardware-based program updates without a PC connection in the field.

• Robust Diagnostic Support: The dual-port design (Ethernet and RS-232) enables simultaneous maintenance and operations. Technicians can perform online monitoring and program edits over Ethernet while the RS-232 port handles local barcode scanners or serial modem links.

FAQs

• Can the 1747-L551 replace an older 1747-L541 (SLC 5/04) processor?

  Yes, provided you update your network architecture. The SLC 5/04 uses DH+ (Data Highway Plus), whereas the 1747-L551 utilizes Ethernet. You must transition your communication links to Ethernet, but the RSLogix 500 project logic remains highly compatible.

• What is the significance of the 16K memory limit?

  The 16K word memory provides ample space for medium-to-large programs, including extensive data logging and recipe management. If your application exceeds this capacity, you should consider the 32K or 64K versions of the SLC 5/05.

• How do I configure the IP address for the first time?

  You can assign the IP address via the BOOTP/DHCP utility provided by Rockwell Automation or through the RS-232 port using a 1747-CP3 cable and RSLinx. Once configured, you can perform all future programming via the Ethernet link.

• Does this processor require a battery?

  Yes, the 1747-L551 uses a 1747-BA lithium battery to retain the RAM contents during power-down. As this unit is 100% Brand New, we recommend verifying the battery installation date during commissioning to ensure maximum data retention security.