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OVERVIEW
Official designation: Allen-Bradley 1746-NO8I (SLC 500, Analog Output Module)
The 1746-NO8I is an 8-channel analog output module for SLC 500 systems, delivering precise current loop control for field devices with an output range of 0 to 20 mA.
KEY SPECS SUMMARY
Power: 5V DC, 200 mA; 24V DC, 100 mA
Interfaces / Ports: One 36-pin connector
Indicators: Module power/status LED
Operating Temp: 0 to 60 degrees C
Platform / Compatibility: SLC 500 modular hardware
Limit: 8 single-ended current outputs
Lifecycle: Active replacement part
FREQUENTLY ASKED QUESTIONS
Technical Specifications:
Q: What is the primary output current range and resolution of the 1746-NO8I module?
A: The primary output range is 0 to 20 mA with a resolution of 12 bits or 13 bits (unipolar).
Wiring & Installation:
Q: Does the 1746-NO8I require external field power in addition to backplane power?
A: Yes, it requires 24V DC field power in addition to the 5V DC backplane power.
Troubleshooting & Compatibility:
Q: What action should be taken if the module fails to maintain a stable current output?
A: Verify the load impedance on the output channel is within the module's specified drive limits.
Replacement & Upgrades:
Q: What is the suggested current-output module for migrating from the 1746-NO8I to a modern platform?
A: Consider the newer analog output modules within the CompactLogix or ControlLogix platforms.
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