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Key Technical Specifications
- Part Number: 1769-OB16
- Manufacturer: Allen-Bradley / Rockwell Automation
- Product Family: Compact I/O
- Module Type: Digital output module
- Output Channels: 16
- Output Type: DC sourcing
- Operating Voltage Range: 20.4-26.4 V DC
- Nominal Voltage: 24 V DC
- Current per Point: 0.5 A max at 60 °C
- Current per Module: 4 A max at 60 °C
- Current Draw @ 5.1 V DC: 200 mA
- Heat Dissipation: 2.11 W max
- Response Time: 0.1 ms on, 1 ms off
- Isolation: 1200 V AC for 1 s, output to bus
- Operating Temperature: 0-60 °C
- Mounting: DIN rail or panel
- Dimensions: 118 x 35 x 87 mm
- Weight: 280 g
Product Introduction
The Allen-Bradley 1769-OB16 is a CompactLogix 16-point DC sourcing output module used to switch 24 VDC field loads from a PLC. It is a common fit for solenoids, indicators, relays, and other discrete DC devices.
It is chosen when you want a compact solid-state output card with fast switching and predictable wiring. The 16-channel layout, 24 VDC operating range, and compact I/O form factor make it a frequent replacement in machine panels and small process systems.
1769-OB16
Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to this Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| Output LED is on, but load stays off | Open field wire, missing common supply, or bad load | ✅ High | Measure 24 V DC at the load and check the output common | Verify field wiring and supply first |
| One point never energizes | Damaged transistor output or wiring fault | ✅ High | Move the wire to a known-good point and re-test | Isolate the channel before replacing the module |
| Multiple outputs fail together | Group supply missing or external fuse blown | ✅ High | Check the group feed and output common terminals | Restore the field power path first |
| Output is stuck on | Shorted field wiring or failed output transistor | ✅ High | Remove the field wire and verify whether the point still stays on | Replace only after confirming the load circuit is clear |
| Outputs chatter or pulse | Program logic issue or unstable field supply | ⚠️ Medium | Monitor the commanded state in the controller and measure supply stability | Fix the logic or power problem first |
| Module not recognized by controller | Poor seating, backplane issue, or wrong slot setup | ⚠️ Medium | Reseat the module and check controller diagnostics | Verify the expansion bus before swapping hardware |
| Excess heat at the module | Overcurrent load or short circuit | ✅ High | Measure actual current per point and compare to spec | Reduce the load and inspect wiring |
If the issue continues, send support photos of the wiring, controller diagnostics, and module LEDs.
Frequently Asked Questions
Q: Is the 1769-OB16 a sourcing output module?
A: Yes. It is a 24 VDC current-sourcing output card, so the load and wiring need to match that topology.
Q: Can I use it for solenoids and pilot lights?
A: Yes, that is a normal use case. Just stay within the per-point and per-module current limits.
Q: Is it the same as a relay output card?
A: No. It is a solid-state transistor output module, so it switches faster but does not give you dry contacts like a relay module.
Q: What controllers does it work with?
A: It is used with CompactLogix and MicroLogix 1500 systems. Confirm the exact platform and expansion layout before ordering.
Q: Why is this often sold as New Surplus?
A: Because it is common legacy inventory from old projects or spare stock. That is normal for Compact I/O parts, especially when people are buying replacements for installed equipment.
Q: What should I check before blaming the module?
A: Check the 24 VDC field supply, the common terminal, and the load wiring first. Most output issues on this type of card come from the field side, not the output transistor itself.
Q: What is the most common install mistake?
A: Forgetting that it is a sourcing module and wiring it like a sinking module. That mistake will waste your time fast, so verify the load return path before power-up.
