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OVERVIEW
Official designation: Allen-Bradley 1756-L55M22 (ControlLogix5555, Processor Module)
Role/Application: High-performance PLC manages discrete and motion control within Logix5000 systems using 1.5MB total user memory.
KEY SPECS SUMMARY
Power: 1.25A at 5.1V DC
Interfaces / Ports: RS-232 Serial Port
Indicators: RUN, FORCE, OK LEDs
Operating Temp: 0 to 60 degrees C
Platform / Compatibility: ControlLogix Chassis
Limit: 250 Connections Max
Lifecycle: End of Life
FREQUENTLY ASKED QUESTIONS
Technical Specifications:
Q: What is the total combined user memory for the 1756-L55M22 processor?
A: The module features 750 KB for data and 750 KB for programs.
Wiring & Installation:
Q: What type of serial cable is required for direct PC connection?
A: Use a 1756-CP3 or 1747-CP3 null-modem serial cable.
Troubleshooting & Compatibility:
Q: What does a solid red OK LED signify on this Logix5555 unit?
A: A solid red OK light indicates a non-recoverable hardware fault.
Replacement & Upgrades:
Q: Which current series is the recommended upgrade for the obsolete L55 series?
A: The ControlLogix 1756-L7 or L8 series are current replacements.
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| After-sales Service Contact or Customer Support Number | See this page for details |
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