National Instruments SCXI-1124 – Multi‑Channel Analog Output for SCXI Test & Control Racks

The NI SCXI‑1124 is a multi‑channel analog output module designed for the SCXI chassis platform, typically used when you need stable voltage or current signals in automated test stands and light industrial control. From my experience, it slots neatly into mixed-signal SCXI racks and plays well with LabVIEW and NI‑DAQ software, making it a practical choice for driving actuators, simulating sensors, or feeding reference signals to external equipment.

You might notice that it bridges the gap between bench testing and small control panels: voltage outputs for devices expecting ±10 V or 0–10 V references, and current outputs for 0–20 mA/4–20 mA loops show up in many cases. That flexibility is the main reason teams keep the SCXI‑1124 in legacy ATE racks and pilot plants.

• Multi‑range analog outputs – Supports common voltage ranges (e.g., ±10 V, 0–10 V) and current loops (0–20 mA, 4–20 mA) for process devices and sensor simulation.

• Seamless SCXI integration – Controlled via the SCXI backplane using an NI DAQ device; reduces wiring clutter and centralizes system timing, typically improving reliability.

• Software compatibility – Works with LabVIEW and LabWindows/CVI through NI‑DAQmx or Traditional NI‑DAQ (depending on your DAQ hardware and OS support).

• Per‑channel configuration – Set voltage/current modes channel‑by‑channel, so one module can drive a mix of transducers and reference inputs.

• Accessory ecosystem – Pairs with front terminal blocks (such as SCXI‑1325 screw‑terminal) for clean field wiring and easier maintenance.

• One‑slot footprint – Saves rack space in SCXI‑1000/1001 chassis; helpful when you’re building a compact test station.

• Process control: drive 4–20 mA valve positioners, pressure transmitter loops, and analog speed references on VFDs.

• Automated test equipment: simulate sensor outputs (e.g., ±10 V) to validate PLC/DAQ input channels and instrument responses.

• HIL and lab benches: feed analog setpoints to power stages, motion drivers, and environmental chambers.

• Pilot plants and R&D rigs: flexible channel configuration for quick re‑tasking between projects.

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• Proven reliability – The SCXI platform is well‑established; spare parts and documentation are easier to source than many bespoke solutions.

• Reduced integration effort – Tight software support and backplane control typically mean less custom wiring and faster bring‑up.

• Mixed‑signal in one rack – Combine the SCXI‑1124 with AI and switching modules to consolidate an entire test plan into a compact chassis.

• Lifecycle continuity – For teams maintaining legacy ATE, the SCXI‑1124 helps extend system life without a full platform redesign.

A maintenance engineer shared a quick note with us: “Swapping the SCXI‑1124 into our 12‑slot rack let us drive both ±10 V references and 4–20 mA loops from one spot. No extra loop isolators, far fewer cables, and it just worked with our existing LabVIEW code.”

• Environment – Mount in an SCXI chassis with adequate ventilation; keep ambient within 0–50 °C. Avoid high‑EMI zones when routing low‑level voltage lines.

• Wiring – Use the recommended terminal block (e.g., SCXI‑1325) and strain‑relief. For current loops, twisted pair helps reduce noise; for voltage outputs, use shielded cable with single‑point grounding.

• Safety – Verify load impedance and loop power before enabling current mode. De‑energize the rack before moving jumpers or re‑terminating wiring.

• Maintenance – Schedule annual calibration (typical practice for ATE). Keep connectors clean and tighten terminals periodically. Update NI‑DAQ drivers/firmware in a controlled test environment before deploying to production.

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• CE marking for EMC and safety (common on SCXI modules).

• UL/CSA recognition may apply depending on manufacturing lot; confirm on device label if you have a compliance checklist.

• RoHS compliance varies by production date for legacy hardware; verify part number and date code when needed.

• Typical manufacturer’s limited warranty: 1 year.

• SCXI‑1325 screw‑terminal block (front‑mount) for clean field wiring to the SCXI‑1124.

• SCXI chassis options: SCXI‑1000 (4‑slot), SCXI‑1001 (12‑slot), SCXI‑1000DC (DC supply version).

• Shielded cabling from the SCXI chassis to your NI DAQ interface, selected per your controller model.

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Note: Specific ranges, channel counts, and update capabilities can depend on your SCXI chassis and the NI DAQ device controlling the system. If you share your target loads and timing requirements, I can suggest a tested configuration for the SCXI‑1124 in your rack.