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OVERVIEW
Official designation: Allen-Bradley 1746-NI8 (SLC 500, Analog Input Module)
This 8-channel, non-isolated, differential analog input module for the SLC 500 system handles voltage or current signals, providing 16-bit resolution for precise process monitoring.
KEY SPECS SUMMARY
Power: 120 mA at 5V DC backplane
Interfaces / Ports: 1746-RT18 terminal block
Indicators: Module status LED
Operating Temp: 0 to 60 degrees C
Platform / Compatibility: SLC 500 chassis
Limit: 8 non-isolated channels
Lifecycle: Active/Legacy
FREQUENTLY ASKED QUESTIONS
Technical Specifications:
Q: What are the primary input signal ranges supported by the 1746-NI8 module?
A: Standard ranges are 0 to 20 mA, 4 to 20 mA, plus 0 to 10 Volts DC.
Wiring & Installation:
Q: Does the 1746-NI8 module require an external power supply for field devices?
A: No, the module receives power directly from the SLC 500 chassis backplane.
Troubleshooting & Compatibility:
Q: What is the primary limitation of using a non-isolated input module like the 1746-NI8?
A: Non-isolated inputs increase susceptibility to ground loops and electrical noise interference.
Replacement & Upgrades:
Q: What is the common replacement module for the 1746-NI8 in a modern Allen-Bradley system?
A: Similar 1769-IF8 or 5069-IF8 modules in the CompactLogix platform are used as replacements.
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