Description
Allen Bradley 1747-L552 Redundant Input/Output Module
1747-L552
The Allen Bradley 1747-L552 serves as the central processing unit (CPU) for SLC 500 systems, orchestrating I/O modules, communication devices, and field equipment in industrial environments. Its design targets applications where moderate processing power and expandability are key—think discrete manufacturing cells, packaging lines, or batch processing systems. Unlike smaller micro-PLCs, it offers sufficient memory and I/O capacity to handle multi-stage processes, while remaining more cost-effective than large-scale Controllogix systems. The Allen Bradley 1747-L552 integrates seamlessly with Rockwell’s ecosystem, making it a staple in facilities already using SLC 500 I/O modules or RSLogix programming software. Its role is foundational: translating programmed logic into real-time actions that keep industrial operations running smoothly.
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Label
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Specification
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Model Number
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1747-L552
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Brand
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Allen Bradley (Rockwell Automation)
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Type
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SLC 500 Programmable Logic Controller (CPU)
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Processor Speed
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10 MHz
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User Memory
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32 KB (expandable to 64 KB with memory modules)
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Power Requirement
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5V DC (from 1746-P1 power supply, 2.5A typical)
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Communication Ports
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1 x RS-232 (DH-485), 1 x RS-232 (programming/ASCII)
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Supported I/O
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Up to 4096 discrete points via SLC 500 I/O modules
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Operating Temp
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0–60°C (32–140°F)
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Mounting
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1746 chassis (1746-A7/A10/A13, etc.)
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Certifications
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UL 508, CSA C22.2 No. 14, CE, ATEX Zone 2
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Dimensions
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127mm (H) x 89mm (W) x 152mm (D)
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Weight
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Approximately 450g (15.9oz)
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Programming Software
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RSLogix 500, RSLogix Micro (compatible)
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In automotive component manufacturing, the Allen Bradley 1747-L552 controls assembly stations for parts like brakes or transmissions. It integrates with proximity sensors and pneumatic actuators, ensuring each step (drilling, fastening, inspection) completes before the next begins. By communicating via DH-485 to a central HMI, it provides real-time status updates, reducing downtime from manual checks. Its durability in dusty or temperature-fluctuating environments further solidifies its role in these demanding settings.
- 1747-L531– A lower-memory variant (16 KB) for simpler applications where program complexity is minimal.
- 1747-L542– A mid-range SLC 500 CPU with 24 KB memory, bridging the gap between entry-level and the 1747-L552.
- 1747-L553– A higher-capacity version with 64 KB standard memory, ideal for large programs or extensive data logging.
- 1746-P1– The mandatory power supply for the 1747-L552, providing 5V DC to the SLC 500 chassis.
- 1747-KE– A DH-485 communication module that extends the 1747-L552’s network reach to remote I/O or HMIs.
- 1746-IB16– A 16-point digital input module commonly paired with the 1747-L552 for discrete sensor integration.
- 1747-SN– A software key enabling advanced features in RSLogix 500 when programming the 1747-L552.
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