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OVERVIEW
Official designation: Allen-Bradley 1791-24B8 (Block I/O, Combination Discrete I/O Module)
Role/Application: This DC-powered 32-point combination module provides 24 discrete inputs and 8 discrete outputs for remote, distributed control using the Remote I/O link.
KEY SPECS SUMMARY
Power: 19.2 to 30V DC, 300 mA draw
Interfaces / Ports: Remote I/O link, two removable terminal strips
Indicators: Individual input/output LED indicators
Operating Temp: 0 degrees C to plus 60 degrees C
Platform / Compatibility: PLC-2, PLC-3, PLC-5, and SLC family processors
Limit: Max output current 500 mA (Vertical); derated above 30 degrees C
Lifecycle: Discontinued/Obsolete
FREQUENTLY ASKED QUESTIONS
Technical Specifications:
Q: What are the input and output voltage ranges for the 1791-24B8 DC block I/O module?
A: Both the 24 inputs and 8 outputs operate within a range of 10 to 30V DC.
Wiring & Installation:
Q: What is the recommended wire size for connecting field devices to the I/O terminals?
A: Input and output wiring should use up to 14 AWG stranded wire.
Troubleshooting & Compatibility:
Q: Does the 1791-24B8 module support fast and slow input signal delay settings?
A: Yes, it supports 1 ms ON, 5 ms OFF (fast) and 1 ms ON, 18 ms OFF (slow).
Replacement & Upgrades:
Q: What is the maximum surge current rating for the output points on this block I/O module?
A: The non-fused surge current rating is 3 Amps for 50 milliseconds, repeatable every 2 seconds.
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