PXI-2568 Specifications

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Updated2025-10-07
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PXI-2568 Specifications

Caution The protection provided by the PXI-2568 can be impaired if it is used in a manner not described in this document.

Definitions

Warranted specifications describe the performance of a model under stated operating conditions and are covered by the model warranty.

Characteristics describe values that are relevant to the use of the model under stated operating conditions but are not covered by the model warranty.

Typical specifications describe the performance met by a majority of models.
Nominal specifications describe an attribute that is based on design, conformance testing, or supplemental testing.

Specifications are Typical unless otherwise noted.

Conditions

Specifications are valid at 23 °C unless otherwise noted.

All voltages are specified in DC, AC_pk, or a combination unless otherwise specified.

Topology

Topologies

31-SPST (form A, latching)

15-DPST

PXI-2568 Pinout

15-DPST Topology

Table 1. Signal Descriptions
Signal	Description
CHxW0	Wire 0 signal connection
CHxW1	Wire 1 signal connection
COMxW0	Routing destination for W0 on the corresponding channel
COMxW1	Routing destination for W1 on the corresponding channel
—	No connection

31-SPST Topology

Table 2. Signal Descriptions
Signal	Description
CHx	Signal connection
COMx	Routing destination for the corresponding channel

Input

Caution This module is rated for Measurement Category I. It is intended to carry signal voltages no greater than 100 V_rms, 150 V_pk, or 150 VDC. This module can withstand up to 800 V impulse voltage. Do not use this module for connection to signals or for measurements within Categories II, III, or IV. Do not connect to MAINS supply circuits (for example, wall outlets) of 115 VAC or 230 VAC.

Caution When hazardous voltages (>42.4 V_pk/60 V DC) are present on any channel, safety low-voltage (≤42.4 V_pk/60 V DC) cannot be connected to any other channel.

Maximum switching voltage
Channel-to-channel	150 V
Channel-to-ground	150 V, CAT I

Caution The switching power is limited by the maximum switching current and the maximum voltage and must not exceed 60 W, 62.5 VA.

Maximum switching power (per channel)^[1]¹ Switching inductive loads (for example, motors and solenoids) can produce high voltage transients in excess of the module's rated voltage. Without additional protection, these transients can interfere with module operation and impact relay life. For more information about transient suppression, visit ni.com/info and enter the Info Code relayflyback.	60 W, 62.5 VA (DC to 60 Hz)
Maximum current (switching or carry, per channel)	2 A

Dynamic Characteristics

Maximum cycle speed

145 cycles/s

Relay operate time^[2]² Certain applications may require additional time for proper settling. Refer to the NI Switches Help for more information about including additional settling time.

1 ms, typical

3.4 ms, maximum

Expected relay life^[3]³ Relays are field replaceable. Refer to the NI Switches Help for more information about replacing a failed relay.

Mechanical

1 × 10⁸ cycles

Electrical
10 VDC, 100 mADC resistive	2.5 × 10⁶ cycles
10 VDC, 1 ADC resistive	1 × 10⁶ cycles
30 VDC, 1 ADC resistive	5 × 10⁵ cycles
30 VDC, 2 ADC resistive	1 × 10⁵ cycles

Trigger Characteristics

Input trigger
Sources	PXI trigger lines <0...7>
Minimum pulse width^[4]⁴ The PXI-2568 recognizes trigger pulse widths less than 150 ns if digital filtering is disabled. Refer to the NI Switches Help for information about disabling digital filtering.	150 ns

Output trigger
Destinations	PXI trigger lines <0...7>
Default pulse width	2 µs, typical

Physical

Relay type	Electromechanical, latching
Relay contact material^[5]⁵ Certain devices are built with silver, gold covered. Contact NI for more details on a specific device.	Palladium-ruthenium, gold covered
I/O connector	62-pin D-SUB, male
PXI power requirement	6 W at 5 V, 2.5 W at 3.3 V
Dimensions (L × W × H)	3U, one slot, PXI/cPCI module, 21.6 cm × 2.0 cm × 13.0 cm(8.5 in. × 0.8 in. × 5.1 in.)
Weight	227 g (8 oz)

Environment


Maximum altitude	2,000 m (at 25 °C ambient temperature)
Pollution degree	2
Indoor use only

Operating Environment

Ambient temperature range	0 °C to 55 °C (Tested in accordance with IEC 60068-2-1 and IEC 60068-2-2.)
Relative humidity range	10% to 90%, noncondensing (Tested in accordance with IEC 60068-2-56.)

Storage Environment

Ambient temperature range	-20 °C to 70 °C (Tested in accordance with IEC 60068-2-1 and IEC 60068-2-2.)
Relative humidity range	5% to 95%, noncondensing (Tested in accordance with IEC 60068-2-56.)

Shock and Vibration

Operational shock

30 g peak, half-sine, 11 ms pulse (Tested in accordance with IEC 60068-2-27. Test profile developed in accordance with MIL-PRF-28800F.)

Random vibration
Operating	5 Hz to 500 Hz, 0.31 g_rms (Tested in accordance with IEC 60068-2-64.)
Nonoperating	5 Hz to 500 Hz, 2.46 g_rms (Tested in accordance with IEC 60068-2-64. Test profile exceeds the requirements of MIL-PRF-28800F, Class 3.)

Compliance and Certifications

Safety Compliance Standards

This product is designed to meet the requirements of the following electrical equipment safety standards for measurement, control, and laboratory use:

IEC 61010-1, EN 61010-1
UL 61010-1, CSA C22.2 No. 61010-1

Note For safety certifications, refer to the product label or the Product Certifications and Declarations section.

EMC Guidelines

This product was tested and complies with the regulatory requirements and limits for electromagnetic compatibility (EMC). These requirements and limits provide reasonable protection against harmful interference when the product is operated in the intended operational electromagnetic environment.

This product is intended for use in industrial locations. However, harmful interference may occur in some installations, when the product is connected to a peripheral device or test object, or if the product is used in residential areas. To minimize interference with radio and television reception and prevent unacceptable performance degradation, install and use this product in strict accordance with the instructions in the product documentation.

Furthermore, any changes or modifications to the product not expressly approved by NI could void your authority to operate it under your local regulatory rules.

Refer to the following notices for cables, accessories, and prevention measures necessary to ensure the specified electromagnetic compatibility (EMC) performance.

Note Operate this product only with shielded cables and accessories.

Note Refer to the Read Me First: Safety and Electromagnetic Compatibility document for important safety and electromagnetic compatibility information. To obtain a copy of this document online, visit ni.com/docs, and search for the document title.

Note When exposed to transient electromagnetic phenomena such as electrostatic discharge (ESD) or power surges, this product may experience a temporary upset or other performance degradation that requires more than 10 seconds for self-recovery.

Note The FlexRIO FPGA module front panel interface is sensitive to electrostatic discharge. Use caution when handling the FlexRIO FPGA module to prevent damage to the internal components exposed by this interface.

Note Using the PXI-2568 in a manner not described in this document may impair the protection the PXI-2568 provides.

Electromagnetic Compatibility

This product meets the requirements of the following EMC standards for electrical equipment for measurement, control, and laboratory use:

EN 61326-1 (IEC 61326-1): Class A emissions; Basic immunity
EN 55011 (CISPR 11): Group 1, Class A emissions
EN 55022 (CISPR 22): Class A emissions
EN 55024 (CISPR 24): Immunity
AS/NZS CISPR 11: Group 1, Class A emissions
AS/NZS CISPR 22: Class A emissions
FCC 47 CFR Part 15B: Class A emissions
ICES-001: Class A emissions

Note In the United States (per FCC 47 CFR), Class A equipment is intended for use in commercial, light-industrial, and heavy-industrial locations. In Europe, Canada, Australia, and New Zealand (per CISPR 11), Class A equipment is intended for use only in heavy-industrial locations.

Note Group 1 equipment (per CISPR 11) is any industrial, scientific, or medical equipment that does not intentionally generate radio frequency energy for the treatment of material or inspection/analysis purposes.

Note For EMC declarations, certifications, and additional information, refer to Product Certifications and Declarations.

Product Certifications and Declarations

Refer to the product Declaration of Conformity (DoC) for additional regulatory compliance information. To obtain product certifications and the DoC for NI products, visit ni.com/product-certifications, search by model number, and click the appropriate link.

Environmental Management

NI is committed to designing and manufacturing products in an environmentally responsible manner. NI recognizes that eliminating certain hazardous substances from our products is beneficial to the environment and to NI customers.

For additional environmental information, refer to the Engineering a Healthy Planet web page at ni.com/environment. This page contains the environmental regulations and directives with which NI complies, as well as other environmental information not included in this document.

EU and UK Customers

Waste Electrical and Electronic Equipment (WEEE)—At the end of the product life cycle, all NI products must be disposed of according to local laws and regulations. For more information about how to recycle NI products in your region, visit ni.com/environment/weee.

电子信息产品污染控制管理办法（中国RoHS）

中国RoHS— NI符合中国电子信息产品中限制使用某些有害物质指令(RoHS)。关于NI中国RoHS合规性信息，请登录 ni.com/environment/rohs_china。(For information about China RoHS compliance, go to ni.com/environment/rohs_china.)

¹ Switching inductive loads (for example, motors and solenoids) can produce high voltage transients in excess of the module's rated voltage. Without additional protection, these transients can interfere with module operation and impact relay life. For more information about transient suppression, visit ni.com/info and enter the Info Code relayflyback.

² Certain applications may require additional time for proper settling. Refer to the NI Switches Help for more information about including additional settling time.

³ Relays are field replaceable. Refer to the NI Switches Help for more information about replacing a failed relay.

⁴ The PXI-2568 recognizes trigger pulse widths less than 150 ns if digital filtering is disabled. Refer to the NI Switches Help for information about disabling digital filtering.

⁵ Certain devices are built with silver, gold covered. Contact NI for more details on a specific device.