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Key Technical Specifications
- Catalog Number: 1746-NO4V
- Manufacturer: Allen-Bradley
- Product Family: SLC 500
- Module Type: Analog output module
- Output Channels: 4
- Output Range: -10 to +10 VDC
- Resolution: 12-bit
- Backplane Current at 5 VDC: 55 mA
- Backplane Current at 24 VDC: 145 mA
- Output Load Current: 10 mA max
- Isolation: 500 VDC field to backplane
- Calibration: Factory calibrated
Product Introduction
The Allen-Bradley 1746-NO4V is a 4-point analog voltage output module for the SLC 500 platform. It converts PLC output words into analog voltage signals for drives, actuators, valve positioners, and other analog control devices.
This module is used where a legacy SLC 500 panel needs four stable voltage outputs in the ±10 VDC range. The 1746-NO4V is non-isolated, factory calibrated, and fits standard SLC racks, so it is a direct replacement when the original analog output card must match the existing control scheme.
1746-NO4V
1746-NO4V
Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to this Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| Output stays at 0 V | No backplane power, bad slot, or logic not writing output | ✅ High | Measure rack power and check the PLC output word | Verify the controller is commanding the channel first |
| Output is stuck at full scale | Program scaling error or bad analog value | ✅ High | Compare the output word to the expected value | Check the program before replacing the module |
| One channel dead, others work | Damaged output channel or bad field wiring | ✅ High | Swap the field wire to another known-good channel | If the fault follows the channel, the module is suspect |
| Output is noisy or unstable | Load impedance too low or wiring noise | ✅ High | Measure the load and inspect cable shielding | Keep the load within spec and clean up the wiring |
| Drive or actuator does not respond | Incorrect scaling or wrong input on the receiving device | ⚠️ Medium | Verify the receiving device expects ±10 VDC | Confirm the downstream device is set up correctly |
| Module fault LED on | Internal fault or power issue | ✅ High | Reseat the module and recheck chassis power | Replace only after confirming the rack supply is stable |
If you are stuck, send photos of the wiring, output scaling, and controller diagnostics to technical support.
Frequently Asked Questions
Q: What is the 1746-NO4V used for?
It is an analog voltage output module for the SLC 500 PLC family. It sends control voltage to external devices like drives and actuators.
Q: Is it a current output module?
No. This is the voltage-output version. If you need 4-20 mA output, this is not the right module.
Q: Does it output 0-10 V or ±10 V?
The standard catalog description is -10 to +10 VDC. Some listings shorten that to 10 VDC output, but the full range is the important one to verify.
Q: Is this part still made by Rockwell?
No. It is a legacy SLC 500 module, so most units are surplus or refurbished.
Q: Is it isolated?
No, it is a non-isolated analog output module. That matters when you are dealing with grounding and signal reference.
Q: What usually gets blamed on the module when the real issue is elsewhere?
Bad scaling in the PLC program, a receiving device that expects current instead of voltage, or a load that is wired wrong. Those are common mistakes.
Q: What should I verify before ordering?
Check the exact part number, output range, load requirement, and whether your downstream device accepts voltage input. The module can be perfectly good and still be wrong for the application if the receiving equipment is expecting current.
