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Phone: +86 16626708626Description
Key Technical Specifications
- Part Number: 1769-OF4
- Manufacturer: Allen-Bradley / Rockwell Automation
- Product Family: Compact I/O
- Module Type: Analog output module
- Output Channels: 4 single-ended
- Output Voltage Ranges: ±10 V, 0-10 V, 0-5 V, 1-5 V
- Output Current Ranges: 0-20 mA, 4-20 mA
- Full-Scale Ranges: ±10.5 V, -0.5 to 10.5 V, -0.5 to 5.25 V, 0.5 to 5.25 V, 0 to 21 mA, 3.2 to 21 mA
- Resolution: 15 bits plus sign, unipolar and bipolar
- Current Draw @ 5.1 V DC: 120 mA
- Current Draw @ 24 V DC: 170 mA
- Heat Dissipation: 2.86 W
- Operating Temperature: 0-60 °C
- Mounting: DIN rail or panel
- Dimensions: 118 x 35 x 87 mm
- Weight: About 1.0 lb
Product Introduction
The Allen-Bradley 1769-OF4 is a CompactLogix 4-channel analog output module used to drive voltage or current signals to field devices. It is commonly used for valves, drives, actuators, and other analog final control elements.
Its value is simple: one module covers both voltage and current output needs with a compact footprint. The 15-bit resolution, selectable ranges, and straightforward 1769 compatibility make it a common replacement in control panels that need stable analog output control.
1769-OF4
1769-OF4
Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to this Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| Output stays at zero | Wrong scaling, bad configuration, or controller not commanding the channel | ✅ High | Verify raw output value in the PLC and check the module setup | Confirm software configuration before replacing hardware |
| Current loop does not move | Open circuit, wrong load, or bad field wiring | ✅ High | Measure loop current at the terminal block | Check the wiring and receiving device first |
| Voltage output is unstable | Loose terminal, poor grounding, or wrong load impedance | ✅ High | Measure voltage directly at the output terminals | Rework wiring and grounding before blaming the module |
| One channel is dead | Damaged output circuit or local terminal issue | ✅ High | Move the command to another channel and compare readings | Isolate the channel before ordering a replacement |
| Output saturates at full scale | Incorrect engineering units or overrange signal | ✅ High | Compare commanded value, raw counts, and output range | Fix scaling and range selection first |
| Noise on output signal | Cabinet grounding, shield problem, or nearby power wiring | ⚠️ Medium | Inspect cable shielding and output waveform | Improve wiring practice and separation |
| Module runs hot | Overload or cabinet temperature too high | ⚠️ Medium | Measure load current and cabinet ambient temperature | Reduce load and verify ventilation |
If the issue remains, send support photos of the wiring, controller diagnostics, and module configuration screens.
Frequently Asked Questions
Q: Does the 1769-OF4 support both current and voltage output?
A: Yes. It supports both current and voltage ranges, which is the main reason it gets used so often in compact analog control applications.
Q: How many channels does it have?
A: Four single-ended analog outputs.
Q: Can I use it for 4-20 mA valve positioners?
A: Yes, as long as the load and wiring are within spec. Verify the loop impedance and make sure the receiving device is wired correctly.
Q: Is this module isolated between channels?
A: It is a single-ended analog module, so you still need to pay attention to grounding and signal reference. That is where field problems usually start.
Q: Why is this often sold as New Surplus?
A: Because it is frequently pulled from excess project inventory or unused stock. That keeps the cost down, but the part number and condition still need to be checked carefully.
Q: What should I verify before replacing one?
A: Confirm the output type, range, loop wiring, and controller configuration. Most analog output “failures” are actually scaling or field wiring problems.
Q: Is the 1769-OF4 hard to wire wrong?
A: It can be if you assume the wrong range or mix up current versus voltage wiring. Take a photo of the old wiring and match the channel setup before power-up.
