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Phone: +86 16626708626Description
Key Technical Specifications
- Catalog Number: 1746-NO8V
- Manufacturer: Allen-Bradley
- Product Family: SLC 500
- Module Type: Analog output module
- Output Channels: 8
- Output Range: -10 to +10 VDC
- Additional Configurable Ranges: 0-5 VDC, 1-5 VDC, 0-10 VDC
- Resolution: 16-bit
- Backplane Current at 5 VDC: 120 mA
- Backplane Current at 24 VDC: 160 mA
- Backplane Power Consumption: 5.6 W
- Output Load: 1 kΩ minimum, 10 mA maximum
Product Introduction
The Allen-Bradley 1746-NO8V is an 8-channel analog voltage output module for the SLC 500 platform. It converts PLC output data into controlled voltage signals for drives, actuators, and other analog field devices.
This module is used when a legacy SLC 500 panel needs eight voltage outputs with 16-bit resolution and individual channel configuration. The 1746-NO8V is a good fit where the downstream equipment expects ±10 VDC, 0-10 VDC, or 1-5 VDC control signals and the original rack layout must stay intact.
1746-NO8V
1746-NO8V
Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to this Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| Output stays at 0 V | No backplane power or PLC not writing output | ✅ High | Measure rack power and check the output word | Verify the controller command before replacing the module |
| Output is stuck at full scale | Scaling or configuration error | ✅ High | Compare the program value to the expected output range | Check the PLC scaling first |
| One channel dead, others work | Damaged output channel or field wiring issue | ✅ High | Move the load to a known-good channel | If the fault follows the channel, the module is suspect |
| Output is noisy or unstable | Load too low, grounding issue, or bad cable shield | ✅ High | Measure the load and inspect cable shielding | Keep the load within spec and clean up the wiring |
| Receiving device does not respond | Wrong voltage range or wrong device input type | ⚠️ Medium | Verify the downstream device expects voltage input | Match the output range to the receiving equipment |
| Module fault LED on | Internal fault or unstable rack power | ✅ High | Reseat the module and recheck chassis supply | Confirm rack power before assuming card failure |
If you are stuck, send photos of the wiring, output scaling, and controller diagnostics to technical support.
Frequently Asked Questions
Q: What does the 1746-NO8V do?
It is an 8-channel analog voltage output module for the SLC 500 family. It sends controlled 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, you need the current-output variant instead.
Q: What output ranges does it support?
The main range is -10 to +10 VDC, and the module can also be configured for 0-5 VDC, 1-5 VDC, and 0-10 VDC.
Q: Is it isolated?
No, this module is not the isolated type. That means grounding and signal reference need to be handled carefully.
Q: Is this part still produced by Rockwell?
No. It is a discontinued SLC 500 module, so most stock is surplus or refurbished.
Q: What should I verify before ordering?
Check the exact catalog number, the output range, the receiving device input type, and the load impedance. A lot of bad installs come from plugging a voltage-output module into a device that actually wants current.
