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- Key Technical Specifications
| Parameter | Specification |
| Part Number | 776577-63R |
| Relay Channels | 32 Single-Pole Single-Throw (SPST) Form A |
| Relay Type | Solid-State Relays (Optically Isolated MOSFET switches) |
| Max Switching Voltage | 60 V DC, 30 V AC RMS (42.4 V peak) |
| Max Switching Current | 450 mA continuous per channel (DC or AC peak) |
| On-State Resistance | 1.5 Ω typical, 2.5 Ω maximum |
| Isolation Voltage | 300 V RMS channel-to-bus / bank-to-earth |
| Switching Time | Turn-on: 1.0 ms max | Turn-off: 0.5 ms max |
| Max Switching Rate | 200 cycles/second |
| Compatible Terminal Blocks | SCXI-1326, SCXI-1302 |
| Power Requirements | +5 V DC (100 mA), +24 V DC (250 mA max) from chassis backplane |
| Operating Temperature | 0 to 50°C (32 to 122°F) |
- Product Introduction
The National Instruments SCXI-1163R is a 32-channel optically isolated solid-state relay (SSR) module designed for switching low-power DC and AC loads in automated test systems and process control racks. Utilizing MOSFET-based solid-state switches rather than mechanical armatures, it delivers bounce-free, silent switching with virtually infinite mechanical life at actuation rates up to 200 Hz.
Featuring 300 V RMS optical isolation between output banks and the chassis backplane, the SCXI-1163R isolates sensitive digital acquisition cards (E/M/X Series PXI/PCI) from field voltage spikes, ground loops, and noisy external inductive loads. Test engineers specify the SCXI-1163R for automated production line testing, solenoid valve actuation, multiplexer switching, and high-speed matrix control.
SCXI-1163R
- Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to this Part | Quick Check Method | Recommendation |
| Module fails self-test in NI MAX | Chassis backplane fuse blown or address jumper misconfigured | ✅ High | Re-seat module in chassis; verify SCXI chassis power rails and test card detection | Confirm SCXI ID jumpers match software configuration. Verify +5 V and +24 V power rails from SCXI backplane. |
| Relay fails to close (High resistance when driven high) | External load current exceeds 450 mA or drive voltage < min threshold | ✅ High | Measure voltage across load terminals with multimeter during logic ON command | Verify load draw is strictly under 450 mA continuous. If load current is fine but channel stays open, internal optical driver is damaged. Replace module. |
| High off-state leakage voltage | Expected behavior of solid-state relays with high-impedance loads | ❌ Low | Measure voltage across load with load connected vs disconnected | Solid-state relays exhibit minor OFF-state leakage current (~1 µA). Connect a small pull-down resistor across high-impedance inputs if floating voltage causes false triggers. |
| Channel shorted permanently (Stuck ON) | Overcurrent or high voltage transient fused the internal MOSFET | ✅ High | Measure resistance across switch terminals with card completely unpowered | Resistance should be >1 MΩ unpowered. If reading measures ~1.5 Ω unpowered, the internal MOSFET output stage is permanently shorted. Replace card. |
- Frequently Asked Questions (FAQ)
Q: What is the advantage of the SCXI-1163R over electromechanical relay cards like the SCXI-1160?
A: The SCXI-1163R uses solid-state relays (MOSFETs) with no moving mechanical parts. This eliminates contact bounce, provides significantly faster switching speeds (up to 200 Hz vs 10-20 Hz for mechanical relays), and offers virtually infinite mechanical operating life, making it superior for high-duty-cycle automated test operations.
Q: Can I switch 120 V AC line voltage with the SCXI-1163R?
A: No. The maximum switching limit is 60 V DC or 30 V AC RMS (42.4 V peak). Attempting to switch 120 V AC mains voltage will break down the internal SSR MOSFET junctions and cause permanent short circuits. For 120 V AC switching, use an electromechanical relay module like the SCXI-1160 or SCXI-1161.
Q: Which terminal block is recommended for connecting field wiring to this card?
A: The SCXI-1326 high-voltage screw terminal block is designed specifically for the . It provides secure screw terminal access and maintains proper safety clearances for high-density wiring harnesses.
Q: Is the hot-swappable in an active SCXI chassis?
A: No. Always power down the SCXI chassis and host controller before removing or inserting the module. Hot-swapping risks latching up the backplane control bus or damaging the onboard multiplexer drivers.
Q: How do you verify performance on surplus NI relay cards before shipping?
A: Every unit passes a strict 5-step SOP quality inspection. We clean all backplane edge connectors, insert the card into an active SCXI-1000 chassis, execute a continuous 24-hour switching cycle across all 32 SSR channels under a 400 mA load, test ON-state resistance limits (<2.5 Ω), and perform a 500 V Megger insulation check prior to anti-static packaging.
