NI SCXI-1349 Adapter Connection Guide

Step 5: Final inspection and power on

Check if all connections are secure and if the screws are tightened.

Confirm that no metal foreign objects have fallen into the interior of the chassis.

Reinsert the SCXI chassis power cord and turn on the chassis power switch.

Open the computer and enter the Measurement&Automation Explorer (MAX) to verify if the SCXI module is correctly recognized.

Attention: During the entire installation process, do not insert or remove the SCXI-1349 adapter or module while the chassis is powered on, as this may cause equipment damage.

Technical specifications

The design of SCXI-1349 meets the requirements of industrial grade data acquisition systems, and its main specifications are as follows.

Analog input characteristics

Maximum operating voltage: 30 Vrms, 42 Vpk, 60 VDC (signal+common mode voltage). This means that the voltage range that the adapter itself can withstand is limited, and when connecting to higher voltage field signals, the SCXI module's built-in isolation or attenuation function must be used.

Environmental specifications

Working temperature: 0 ° C to 50 ° C

Storage temperature: -20 ° C to 70 ° C

Relative humidity: 10% to 90%, no condensation

Safety Certification

Design standards: Complies with IEC 61010-1, UL 3111-1, and CAN/CSA C22.2 No. 1010.1 (Safety Standards for Electrical Measurement and Testing Equipment).

Altitude: up to 2000 meters.

Installation category: Class I (CAT I, suitable for circuits not directly connected to the main power supply).

Pollution level: Level 2 (only non-conductive pollution, occasional temporary conductivity may occur due to condensation).

Electromagnetic Compatibility (EMC)

Radiation emission: EN 55011 Class A (at 10 meters), FCC Part 15A (above 1 GHz).

Immunity: assessed to comply with EN 61326-1:1997 A1:1998 Table 1.

Compliance Mark: CE, C-Tick, FCC Part 15 Class A.

Important note: To achieve complete EMC/EMI compliance, shielded cables (i.e. 68 pin shielded cables included with SCXI-1349) must be used for operation. Unshielded cables may result in excessive radiation or decreased immunity.

Precautions for safe operation and maintenance

As a key component connecting on-site signal and measurement systems, the safe use of SCXI-1349 is crucial. The following excerpt and extension of the security guidelines in the document:

Prohibited in hazardous environments: Do not operate this equipment in explosive environments or places with flammable gases or vapors.

Damaged equipment must not be used: If the adapter shows obvious damage such as broken casing, damaged connector, moisture or liquid ingress, it should be immediately stopped from use and inspected by trained personnel or sent back to NI for repair.

Unauthorized modification is prohibited: Do not replace unauthorized components or modify the internal circuit of the adapter. Any unauthorized modification may introduce electric shock hazards or damage safety features.

Signal insulation requirements: Users must perform insulation treatment on all signal connections that may come into contact with the highest voltage. Even if the SCXI module itself provides isolation, it should be ensured that exposed wires do not accidentally touch.

Do not exceed the rated value: The signal (including power signal to ground) connected to the adapter must not exceed the maximum signal rating listed in this document, otherwise it may cause electric shock, fire, or damage to all connected boards, chassis, and computers.

Cleaning method: When cleaning the adapter, a soft non-metallic brush should be used to gently brush away any floating dust. For stubborn pollutants, a hard non-metallic brush can be used. After cleaning, it is necessary to ensure that the adapter is completely dry and free of residual pollutants before it can be put back into use.

Supporting chassis requirements: SCXI-1349 must be used in conjunction with UL listed SCXI chassis (such as SCXI-1000, SCXI-1001, SCXI-1000DC) to meet the overall system's safety certification requirements.

Common application scenarios

SCXI-1349 is commonly used in the following system architectures:

Single module single channel system: An SCXI module is directly connected to an E-series DAQ device through an adapter for high-precision measurement of small signals (such as high-resolution thermocouple measurement).

Multi module multiplexing system: Multiple SCXI modules are installed in the same chassis, and signals are multiplexed to the output of one module through the backplane bus, and then connected to DAQ devices through SCXI-1349. In this mode, one analog input channel of the DAQ device can sequentially access multiple channels of multiple modules.

Parallel mode system: If it is necessary to collect independent signals from multiple modules simultaneously, an SCXI-1349 adapter and independent DAQ devices can be configured for each module (the computer needs to have multiple DAQ devices). In this mode, each module directly corresponds to an analog input channel of a DAQ device, achieving the highest parallelism.

Troubleshooting

If the module cannot be recognized or data cannot be read properly after installation, it is recommended to check in the following order: