Description
Product Introduction & Engineering Value
A failed switching module can interrupt an entire automated test sequence even when the measurement hardware is functioning correctly. The SCXI-1163R provides controlled switching of external electrical loads through 32 independent solid-state relay channels, making it suitable for legacy automated test and monitoring systems.
For engineers maintaining older NI SCXI platforms, the value of this module is compatibility. Replacing it requires checking chassis configuration, relay wiring, software drivers, and the original test sequence. A correctly verified spare can restore an existing system without rebuilding the test architecture.
Technical Specifications
| Specification | Details |
|---|---|
| Manufacturer | National Instruments |
| Model | SCXI-1163R |
| Part Number | 776572-63R |
| Product Type | Relay switch module |
| Platform | NI SCXI chassis |
| Relay Channels | 32 channels |
| Relay Type | Optically isolated solid-state relay |
| Contact Configuration | Form A normally open |
| Relay Organization | 8 banks × 4 relays |
| Maximum Switching Voltage | 240 VAC or 240 VDC |
| Maximum Switching Current | 200 mA per channel |
| Maximum Working Voltage | 450 Vrms bank-to-bank / bank-to-ground |
| Leakage Current | 1 µA maximum |
| On Resistance | 8 Ω maximum |
| Turn-On Time | 1.5 ms |
| Turn-Off Time | 0.25 ms |
The SCXI-1163R uses eight isolated relay banks, each containing four independently controlled normally open solid-state relays. It supports serial programming through the SCXIbus and can also operate in parallel mode with compatible digital I/O hardware.
Field Application & The “Trench” Experience
A semiconductor equipment supplier maintained an aging wafer test platform built around an NI SCXI chassis. During production qualification runs, several device switching operations began failing intermittently. The DAQ system remained online, but specific test paths were not being activated consistently.
Maintenance engineers traced the problem to a degraded SCXI-1163R relay module. The replacement procedure included verifying the SCXI slot assignment, restoring the relay control configuration, checking external wiring, and validating switching performance with known loads.
The machine returned to operation without replacing the entire test rack.
Typical application scenarios:
- Semiconductor device test systems requiring automated signal routing
- Production test fixtures for electronic assemblies
- Laboratory switching systems with isolated external loads
- Industrial monitoring systems using legacy NI SCXI hardware
SCXI-1163R
Transparency SOP: QA & Testing
A SCXI-1163R should be tested as a switching device, not simply as a powered module.
Verification process:
- Physical inspection
- Confirm NI model identification
- Inspect SCXIbus connector condition
- Check front and rear connectors
- Look for overheating or contamination
- Electrical testing
- Verify chassis recognition
- Check relay activation response
- Measure switching resistance
- Confirm isolation between banks
- Functional validation
- Test all 32 relay channels
- Verify open/close operation
- Confirm control communication
- Check leakage behavior where required
A relay module stored for years can appear normal while having degraded switching characteristics. Channel-level testing is necessary before production use.
The Veteran’s Tech Trap Guide
⚠️ Do not exceed the relay current rating
The SCXI-1163R is rated for up to 200 mA per channel and 240 V switching. It is not a replacement for high-current contactors or power switching devices. Exceeding these limits can permanently damage the solid-state relay channels.
⚠️ Check inductive loads before connection
Motors, solenoids, and coils can generate voltage transients during switching. External suppression may be required to protect the relay outputs and maintain service life.
PRO TIP: Document the original relay channel mapping before replacement. In large test fixtures, a single wiring mismatch can create confusing test failures.
⚠️ Verify serial/parallel mode settings
The SCXI-1163R uses configurable jumpers for serial and parallel operation. Incorrect jumper settings can prevent communication or cause unexpected relay behavior.
Dynamic FAQ
Q1. What is the NI SCXI-1163R used for?
The SCXI-1163R is a 32-channel solid-state relay module used for automated switching of external electrical loads in NI SCXI-based systems.
Q2. How many relay channels does the SCXI-1163R provide?
It provides 32 optically isolated Form A solid-state relay channels arranged in eight banks of four relays.
Q3. What voltage and current can the SCXI-1163R switch?
Each channel can switch up to 240 VAC/VDC and 200 mA maximum current.
Q4. Is the SCXI-1163R still available from NI?
The SCXI-1163R is a legacy product and is no longer available as a current NI production item. Remaining availability is generally through surplus inventory and refurbished test equipment suppliers.
Q5. What should be checked before replacing an SCXI-1163R?
Verify:
- SCXI chassis compatibility
- Relay wiring configuration
- Serial or parallel mode settings
- External load ratings
- NI software driver compatibility
Q6. Are refurbished SCXI-1163R modules tested?
A qualified refurbished unit should include chassis communication testing, relay channel verification, isolation checks, and switching performance validation.
Q7. What warranty applies to a replacement SCXI-1163R?
Warranty depends on supplier testing standards and product condition. Industrial test equipment suppliers typically provide limited functional warranty coverage for tested surplus or refurbished modules.
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