I. Product Introduction

NI SCXI-1160 is a 16-channel SPDT lockout relay switch module of the SCXI series, used for routing, switching and load control of medium-low level analog/digital signals. It features low on-resistance, low thermal offset, channel isolation, and is suitable for testing and industrial scenarios requiring reliable on-off and signal isolation. The part number is 776572-60. It is currently out of production but still has spare parts and maintenance support available.

II. Model Interpretation

SCXI: Signal Conditioning Extension for Instrumentation, a series of instrument signal conditioning extensions.

1160: A general-purpose relay switch module of the SCXI series, with 16 channels of SPDT lockout relays; the same series includes 1161 as power relays, and 1162/1163 as optically isolated digital I/O.

Part Number: 776572-60.

III. Technical Parameters

Channels: 16 independent SPDT (Form C) lockout relays, each channel includes a common terminal COM, normally open NO, and normally closed NC.

Switch Rating: 250 VAC / 30 VDC, 2 A / channel; maximum switching power 500 VA (AC), 60 W (DC ≤ 30 V).

On-resistance: Initial < 0.1 Ω.

Thermal Offset: Typical < 3 µV.

Relay Characteristics: Lockout type, power-off retention state; action time typical 10 ms, maximum 15 ms; maximum switching rate 50 times / second.

Isolation: Channel-to-channel, channel-to-backplane 150 VDC/125 VAC (CAT I).

Power Supply: +5 V DC (backplane power supply), power consumption approximately 1.5 W.

Temperature: Operating 0 - 55 ℃; Storage -40 - 85 ℃.

Life: Mechanical life ≥ 10 million times, electrical life ≥ 100,000 times (full load).

IV. Interface and Communication Configuration

Front panel: 96-pin DIN connector, compatible with SCXI-1303 shielded terminal block (screw wiring).

Backplane bus: Standard SCXI bus, power supply, control and status reading, supports multi-module cascading and address configuration.

Control and drive: Compatible with NI-SWITCH driver, supports LabVIEW, LabWindows/CVI, C/C++, .NET; can work with NI-DAQmx devices.

Compatibility: Compatible with MIO-16, Lab-PC series and DIO-24/32F/96 DAQ boards.

V. Core Functions

16-channel independent signal routing: SPDT lockout relays, capable of switching analog/digital signals or controlling small power loads, with power-off retention state.

Low-error signal switching: Extremely low on-resistance and thermal offset, suitable for weak signals (such as sensors, thermocouples) for precise routing.

Electrical isolation and anti-interference: Channel-to-channel and channel-to-backplane isolation, blocking ground loops, protecting the rear-end acquisition equipment from high-voltage damage.

Software programmable control: Single-channel independent on-off, supports scanning list and timing control, compatible with automated test sequences.

Multi-module expansion: One chassis can accommodate multiple 1160 modules, expanding to hundreds of channels, building a large-scale switch matrix.

VI. Application Scenarios

Automation test system: Signal multiplexing and matrix scanning in ATE equipment, enabling parallel testing of multiple DUTs.

Data acquisition signal routing: Signal selection and channel expansion for multiple sensors (strain, thermocouples, RTD). Industrial control and load drive: Control relays, solenoid valves, indicator lights, heaters and other small-power devices.

Signal isolation and level conversion: Signal isolation between devices with different ground potentials to eliminate ground loop interference.

Laboratory and research: Switching of experimental conditions, multi-channel signal selection, control of signal paths in precision measurement systems.

VII. Operating and Maintenance Instructions

Operating Instructions

Installation: Disconnect power, insert into the SCXI chassis slot and fix; set module address to avoid conflicts.

Connection: Use SCXI-1303 terminal block, distinguish COM/NO/NC; single-ended grounding of the shielding layer, separate wiring for high voltage and low voltage.

Configuration: Set channel status, scanning rate and timing in NI-SWITCH; pulse trigger switching for closed-relay locking.

Power-on: After correct wiring, turn on the box power, then start the software; prohibit hot plugging to avoid surge damage to contacts.

Maintenance Instructions

Environment: Ventilate and dry, away from strong electromagnetic fields, vibration and high temperatures; humidity 5% - 95% without condensation.

Regular Inspection: Monthly inspection of terminals, connectors and cables, tighten connections, clean dust, prevent oxidation and loosening.

Life Management: Record the number of operations, replace when approaching the lifespan to avoid contact adhesion or poor contact.

Fault Troubleshooting: Check contacts and wiring when there is poor contact; check power supply, grounding and software configuration when there is an erroneous action.

Storage: Disconnect power and remove wires when not in use, clean and store in a cool, dry place, protected from moisture and corrosion.