A-B 1746-NO4V/A (often shown as 1746-NO4VA) – 4‑channel analog voltage output for SLC 500 control

The Allen‑Bradley 1746‑NO4V/A is a 4‑channel analog voltage output module for the SLC 500 platform. It’s a straightforward way to generate control references—think 0…10 V or ±10 V signals—for drives, valve positioners, power supplies, or third‑party instruments. From my experience, teams pick this module when they want predictable scaling in RSLogix 500 and a drop‑in fit for existing 1746 chassis without fuss. You might notice that it’s voltage‑only; if you need current loops, the sister module is the -NO4I.

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Key Features

• 4 analog voltage outputs – Typical ranges include 0…10 V and ±10 V for broad device compatibility.
• 12‑bit resolution (per channel) – Clean, stable output steps suitable for speed reference and position control.
• Standard 1746 backplane – Powered and controlled by the SLC chassis; no external power brick or fieldbus adapters.
• Removable RTB wiring – Screw‑terminal block helps with neat panel wiring and quicker module swaps.
• Status indication – Front LED simplifies basic diagnostics during commissioning.
• Non‑isolated channels – Common‑referenced outputs; plan grounding and shields accordingly for noise‑sensitive loops.

Technical Specifications

Application Fields

• VFD speed references (0…10 V) and servo/positioner command signals on legacy SLC lines.
• Analog setpoints for temperature, pressure, or level controllers that accept voltage inputs.
• Power supplies and test stands where programmable voltage outputs simplify recipe changes.
• Retrofit projects in packaging, water/wastewater, and material handling—keep the 1746 chassis, modernize the field devices.

A maintenance tech in a bottling plant told us they swapped a faulty NO4V on a Saturday callout—downloaded the saved program, verified scaling, and the filler was back in spec before the next shift. That quick recovery is usually why teams keep a spare on the shelf.

Advantages & Value

• Drop‑in compatibility – Works across SLC 5/01…5/05 systems without special firmware tricks.
• Predictable engineering – Straightforward scaling and status bits in RSLogix 500 save troubleshooting time.
• Cost control – Keep your existing 1746 chassis and wiring; no need to re‑certify panels just to restore voltage outputs.
• Procurement certainty – Series A designation helps match installed base hardware for consistent performance.

Installation & Maintenance

• Panel & cabinet – Mount the 1746 chassis in a ventilated enclosure; follow NEC/IEC wiring and maintain analog cable separation from power.
• Wiring practices – Use shielded twisted pair for analog runs; land shields at a single point (controller end is typical) to avoid ground loops.
• Load and grounding – Verify the receiving device input impedance (≥2 kΩ is typical for this module). Tie analog commons carefully to plant ground.
• Configuration – Set the desired range in RSLogix 500 and confirm scaling (engineering units to raw/scale). Label channels and document ranges in the project notes.
• Routine care – Keep vents dust‑free, check terminal tightness, and back up program files after any range or scaling change. Firmware on the CPU, not the module, usually governs behavior.
• Safety – De‑energize the chassis before inserting or removing modules; verify analog outputs are disabled before wiring changes.

Quality & Certifications

• Typically complies with UL/cUL and CE for industrial control equipment; EMC performance depends on installation practices.
• Supplied units covered by our 365‑day warranty.

If you can share the SLC processor type and the devices you’re driving (drive make, input impedance, cable runs), I can double‑check range settings and suggest a clean wiring plan. One thing I appreciate is how quickly this module drops into a chassis and just works—provided the scaling and grounding are tidy.