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OVERVIEW
Official designation: Allen-Bradley 1747-L551 (SLC 5/05, Processor Module)
This SLC 5/05 processor offers 16K words of user memory (64K total backup capacity) and features both RS-232 and Ethernet ports. It controls and coordinates SLC 500 system operations and communication.
KEY SPECS SUMMARY
Power: 1 A at 5V DC backplane
Interfaces / Ports: RJ45 (Ethernet), 9-pin D-sub (RS-232)
Indicators: RUN, FLT, FORCE, COMM LEDS
Operating Temp: 0 to 60 degrees C
Platform / Compatibility: SLC 500 chassis
Limit: 32 simultaneous communication connections
Lifecycle: Discontinued
FREQUENTLY ASKED QUESTIONS
Technical Specifications:
Q: What are the primary communication ports found on the 1747-L551 processor module?
A: The processor features both a built-in Ethernet port and an RS-232 serial port.
Wiring & Installation:
Q: What is the primary function of the battery backup in the 1747-L551 module?
A: The battery retains the CMOS RAM contents, including the program and data, upon power loss.
Troubleshooting & Compatibility:
Q: What does a flashing red FLT indicator light typically signify on the processor?
A: A flashing FLT indicates a major fault condition requiring immediate review of the fault codes.
Replacement & Upgrades:
Q: What is the recommended upgrade path or alternative platform for systems using the 1747-L551?
A: The current platform migration path is typically to the modern Allen-Bradley ControlLogix system.
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