Description
NI SCXI-1163R
Technical Specifications Brand: NI Model: SCXI-1163R Channel Count: 32 SPST relay channels Contact Rating: 30 VDC / 250 VAC maximum, 1 A per channel Relay Type: SPST electromechanical dry contact Isolation: Channel-to-backplane galvanic isolation Operating Temperature: 0°C to +50°C Protection Grade: IP20 Mounting: SCXI chassis plug-in module
Functional Features 32 independent SPST dry contact relay output channels. Galvanic isolation between SCXI control circuit and field load circuit. Software controlled relay on/off switching through DAQ system. Dry contact output supports both AC and DC external load circuits. Front panel screw terminal block for field load wiring. Built-in relay status readback to confirm relay switching state. Overcurrent protection for each relay channel.
Application Scenarios Automated test system relay switching, machine interlock signal control, test fixture power routing, industrial alarm contact triggering, bench top automated equipment sequence control.
Performance Parameters Stable contact resistance after rated switching cycles. Isolation circuit prevents field surge damage to DAQ control system. Relay status readback verifies actual switch state. Reliable on/off operation for low power signal switching. Low leakage current when relay contact opens.
Material Composition Front Panel: Flame retardant black plastic with screw terminal block. PCB: FR4 multilayer printed circuit board. Core Components: Electromechanical SPST relays, relay drive optocoupler, surge suppression components. Terminal Block: Screw-clamp plastic terminal block. Back Connector: Gold plated edge connector for SCXI backplane.
Structural Features SCXI plug-in module design, rear gold finger connects to chassis backplane. Front panel carries 32-channel screw terminal block for field wiring. Each relay sits on PCB with independent drive circuit. Side latch locks module in chassis slot. Internal optocoupler separates relay drive logic from relay coil circuit.
Working Principle DAQ system sends digital command over SCXI backplane bus to module. Onboard drive circuit energizes selected relay coil, moving mechanical contact to close or open external field circuit. Dry contact terminals on front block connect external load circuit, which has no electrical connection with SCXI control side. Module reads relay state and sends status information back to DAQ software for verification. Surge suppression components absorb inductive kickback from relay coil when de-energizing.
Installation Requirements Power off SCXI chassis before inserting module. Lock side latch after module insertion. Wire external load circuit to front screw terminals, follow contact voltage and current rating strictly. Configure relay channel control in NI measurement software. Separate high-voltage load wiring from SCXI control signal wiring.
Usage Notes Do not exceed rated voltage and current of relay contacts. Limit inductive load or add external surge suppression for inductive loads. Check relay contact condition periodically after large number of switching cycles. Wear anti-static wristband during module replacement. Avoid connecting high energy power loads directly to relay channels.
