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OVERVIEW
Official designation: Allen-Bradley 1756-L55M12 (ControlLogix 5550, Programmable Controller)
Role/Application: This controller manages mid-sized automation tasks with 750 KB RAM and broad network support within the 1756 chassis system.
KEY SPECS SUMMARY
Power: 1.25A at 5.1V DC
Interfaces / Ports: RS-232 9-pin D-shell
Indicators: RUN, ERR, IO, BAT
Operating Temp: 0 to 60 degrees C
Platform / Compatibility: ControlLogix Chassis
Limit: 128,000 I/O points
Lifecycle: Discontinued
FREQUENTLY ASKED QUESTIONS
Technical Specifications:
Q: What is the exact available user memory for the 1756-L55M12?
A: This model provides 750 KB of non-volatile RAM for logic.
Wiring & Installation:
Q: Which serial cable is required for local PC communication?
A: Use a 1756-CP3 or 1747-CP3 null modem cable for connection.
Troubleshooting & Compatibility:
Q: What should be done if the BAT indicator is solid red?
A: Replace the 1756-BA1 battery to prevent memory loss during power-off.
Replacement & Upgrades:
Q: Is there a modern replacement for this discontinued L55 series?
A: Migrate to ControlLogix 5570 or 5580 controllers for modern support.
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| Model Name | See this page for details |
| Certification or Licensing Information Required by Law | See this page for details |
| Country of Manufacture or Origin | See this page for details |
| Manufacturer | See this page for details |
| After-sales Service Contact or Customer Support Number | See this page for details |
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