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Phone: +86 16626708626Description
Key Technical Specifications
- Catalog Number: 1746-OBP16
- Manufacturer: Allen-Bradley
- Product Family: SLC 500
- Module Type: High-current sourcing DC output module
- Output Count: 16
- Output Type: Sourcing
- Operating Voltage Range: 20.4-26.4 VDC
- Backplane Current at 5 VDC: 250 mA
- Continuous Current per Point: 1.5 A at 30 °C
- Continuous Current per Point: 1.0 A at 60 °C
- Continuous Current per Module: 6.4 A
- Fuse Protection: Yes, fused common with blown-fuse LED
Product Introduction
The Allen-Bradley 1746-OBP16 is a 16-point high-current sourcing DC output module for the SLC 500 platform. It is used to drive higher-load 24 VDC devices such as solenoids, contactors, and motor starter coils.
This module is chosen when a standard SLC output card is not enough for the load. The 1746-OBP16 supports up to 1.5 A per point at 30 °C, includes fused common protection, and fits existing SLC 500 racks without changing the cabinet layout.
1746-OBP16
1746-OBP16
Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to this Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| Output dead on one channel | Blown fuse or open field wire | ✅ High | Check the blown-fuse LED and measure continuity | Replace the fuse and inspect the load circuit |
| Multiple outputs dead | Common fuse open or supply missing | ✅ High | Verify the fused common and 24 VDC supply | Restore the supply and check for shorts before reapplying power |
| Output trips when load energizes | Overcurrent from coil or shorted device | ✅ High | Measure inrush and steady-state current | Confirm the load is within the module rating |
| Load works on another channel | Original channel fuse or contact issue | ✅ High | Swap to a known-good point | If the fault follows the point, the module side is suspect |
| Module status normal but no load action | Miswiring or wrong common terminal | ✅ High | Compare wiring to the terminal diagram | Rewire the load correctly before replacing hardware |
| Outputs run hot | High aggregate load or poor cabinet cooling | ⚠️ Medium | Measure total module current and cabinet temperature | Reduce load and verify ventilation |
If you are stuck, send photos of the wiring, fuse status, and load nameplate to technical support.
Frequently Asked Questions
Q: What does the 1746-OBP16 do?
It is a 16-point high-current 24 VDC sourcing output module for the SLC 500 family.
Q: How is it different from a regular 1746-OB16?
The OBP16 is built for higher current and includes fused common protection. That makes it better for heavier DC loads.
Q: Does it have electronic protection like the OB16E?
No. The OBP16 uses fused common protection, not the electronic fold-back style used in the “E” modules.
Q: Is this part still produced by Rockwell?
No. It is a legacy SLC 500 module, so most stock is surplus or refurbished.
Q: Can I use it for 120 VAC loads?
No. This is a 24 VDC sourcing output module. AC loads need an AC output or relay output solution.
Q: What should I check before ordering?
Verify the output voltage, per-point current, fuse style, and wiring common. If the machine drives solenoids or contactors at 24 VDC, this is often the right class of module, but the load current still needs to be checked.
