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OVERVIEW
Official designation: Allen-Bradley 1746-OB8 (SLC 500, Discrete Output Module)
The 1746-OB8 is an 8-point, single-slot DC digital output module for the SLC 500 system. It provides eight sourcing outputs rated for 24V DC to control external devices.
KEY SPECS SUMMARY
Power: 5V DC, 135 mA
Interfaces / Ports: Removable wiring terminal block
Indicators: 8 Output Status LEDs
Operating Temp: 0 to 60 degrees C
Platform / Compatibility: SLC 500, 1746 I/O chassis
Limit: 24V DC nominal output
Lifecycle: Discontinued
FREQUENTLY ASKED QUESTIONS
Technical Specifications:
Q: What is the maximum current capacity per output channel on the 1746-OB8 module?
A: Each output channel supports a maximum load current of 3.0 A.
Wiring & Installation:
Q: Does the 1746-OB8 module require external power in addition to the backplane power?
A: Yes, it requires external 24V DC power for the output circuits, separate from the backplane 5V DC.
Troubleshooting & Compatibility:
Q: If an output LED is active but the device is not energizing, what should be checked?
A: Check the external 24V DC output power supply, fuse integrity, and external wiring connections.
Replacement & Upgrades:
Q: What is the recommended replacement module for the discontinued Allen-Bradley 1746-OB8 in SLC 500 systems?
A: Refer to the latest manufacturer manual for the recommended replacement for the 1746-OB8 DC output module.
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