Allen Bradley PLC 1747-L551 Ser C SLC 5/05 Processors Supports A Maximum Of 32 Connections

Allen Bradley 1747-L551 Ser C SLC 5/05 Processors supports a maximum of 32 connections

Product Overview
The Allen-Bradley 1747-L551 is a powerful SLC 5/05 programmable logic controller (PLC) that combines 16K-word user memory with an on-board 10/100 Mbps Ethernet port for seamless integration into plant-wide networks. Supporting advanced PID, high-speed counter, and messaging instructions, the 1747-L551 is ideal for packaging, material handling, water/wastewater and discrete manufacturing applications where real-time data exchange is critical. Drop-in compatibility with existing 1746 I/O racks ensures fast upgrades without rewiring.

Key Features & Benefits
• 16K-word user memory (12K data, 4K program) – handles complex ladder logic
• Built-in 10/100 Mbps Ethernet – eliminates 1747-KE or 1747-AIC modules
• Flash EPROM backup – download programs without batteries
• Support for 30 I/O chassis, 960 discrete and 480 analog I/O maximum
• Up to 4 high-speed counter modules per CPU for packaging & motion
• Battery-backed real-time clock & data table retention
• RSLogix 500 / Studio 5000 Lite programming software compatibility
• UL, CE, C-Tick, Class I Div 2 certified for harsh environments

Typical Applications
• High-speed packaging & labeling lines
• Conveyor & warehouse sortation systems
• Water & wastewater lift stations
• Small batch process skids with PID loops

Technical Specifications
CPU Type: SLC 5/05
Memory: 16K words total (12K data, 4K program)
Communication: 1× 10/100 Mbps Ethernet, 1× DH-485 (RJ-45)
Scan Time: 0.9 ms/K typical
I/O Capacity: 960 digital / 480 analog max
Battery: 1747-BA lithium (3-year typical life)
Power Supply: 5 V DC @ 1 A from 1746 chassis
Operating Temperature: 0 °C to +60 °C (32 °F to 140 °F)

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