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OVERVIEW
Official designation: Allen-Bradley 1775-MR8 (PLC-3, Memory Module)
Role/Application: This is a 32K CMOS RAM memory module designed for PLC-3 controllers to store user programs, data tables, and I/O image tables, often used for data backup.
KEY SPECS SUMMARY
Power: CMOS battery powered, 3.6 Volts nominal
Interfaces / Ports: Backplane connector (single slot), none specified
Indicators: Refer to the latest manufacturer manual.
Operating Temp: 0 to 60 degrees C
Platform / Compatibility: PLC-3 processor system, 1771-I/O chassis
Limit: 32K words CMOS RAM memory
Lifecycle: Discontinued/Obsolete
FREQUENTLY ASKED QUESTIONS
Technical Specifications:
Q: What is the estimated battery life for the 1775-MR8 memory module at 60 degrees C?
A: At 60 degrees C, users can expect approximately 24 months of backup battery life.
Wiring & Installation:
Q: How does the module physically integrate with the PLC-3 system?
A: The 1775-MR8 memory module requires a single slot in the processor chassis of the connected drive.
Troubleshooting & Compatibility:
Q: What are the recommended storage temperature limits to prolong module performance?
A: It is recommended to store the module within a temperature range of minus 55 degrees C to 85 degrees C.
Replacement & Upgrades:
Q: What modern module should be considered for memory redundancy in current Rockwell systems?
A: Successor systems use modules like the 1756-RM or 1756-RM2 ControlLogix redundancy modules.
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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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