OPERATING INSTRUCTIONS AND SPECIFICATIONS NI 9481E 4-Channel SPST Electromechanical Relay Module
This document describes how to use the National Instruments 9481E and includes dimensions, terminal assignments, and specifications for the NI 9481E. Visit ni.com/info and enter rdsoftwareversion to determine which software you need for the modules you are using. For information about installing, configuring, and programming the system, refer to the system documentation. Visit ni.com/info and enter cseriesdoc for information about C Series documentation.
NI 9481E Dimensions The following figure shows the dimensions of the NI 9481E. 73.4 (2.89) 58.4 (2.30) 66.0 (2.60) 26.7 (1.05) 0.0 (0.00) 0.0 (0.00) Figure 1. NI 9481E Dimensions in Millimeters (Inches) © National Instruments Corp.
Connecting the NI 9481E The NI 9481E has a 10-terminal detachable screw-terminal connector that provides connections for four electromechanical relay channels. 3 0 CH0a CH0b CH1a CH1b CH2a CH2b CH3a CH3b NC NC 0 1 2 3 4 5 6 7 8 9 Figure 2. NI 9481E Terminal Assignments NI 9481E Operating Instructions and Specifications 4 ni.
Each electromechanical relay channel has two interchangeable terminals, CHa and CHb. Each channel has an LED that indicates the state of the channel. When a channel LED is lit, the channel is on. When the LED is dark, the channel is off. The LEDs are disabled when the chassis is in sleep mode. Refer to the Sleep Mode section for more information about sleep mode.
Note You must use 2-wire ferrules to create a secure connection when connecting more than one wire to a single terminal on the NI 9481E. When the channel is turned on, the terminal connected to the load drives current or applies voltage to the load. When the channel is off, the terminal does not drive current or apply voltage to the load. Sleep Mode This module supports a low-power sleep mode. Support for sleep mode at the system level depends on the chassis that the module is plugged into.
Specifications The following specifications are typical for the range –40 to 85 °C unless otherwise noted. Output Characteristics Number of channels.......................... 4 electromechanical relay channels Relay type ......................................... Single pole single throw (SPST) Power-on output state ....................... Channels off Switching capacity (resistive load) Switching voltage ....................... 60 VDC max, 250 Vrms max Switching current, per channel One channel on ........
Resistance per channel, channel on......................................... 50 mΩ Switching rate ................................... 1 operation per second Relay release time............................. 5 ms max Relay operate time ............................ 10 ms max Relay bounce time ............................ 3 ms Off state leakage ............................... 10 μA max Life expectancy Mechanical (no load).................. 20,000,000 operations Electrical (connecting to load) ...
Power Requirements Power consumption from chassis Active mode ............................... 580 mW max Sleep mode ................................. 5 mW max Thermal dissipation (at 70 °C) Active mode ............................... 1.5 W max Sleep mode ................................. 5 mW max Physical Characteristics Use a dry, low-velocity stream of air to clean the module. If needed, use a soft-bristle brush for cleaning around components. Screw-terminal wiring ......................
Safety Safety Voltages Connect only voltages that are within the following limits. CHa-to-CHb...................................... 250 Vrms max, Measurement Category II Measurement Category II is for measurements performed on circuits directly connected to the electrical distribution system. This category refers to local-level electrical distribution, such as that provided by a standard wall outlet, for example, 115 V for U.S. or 230 V for Europe.
Channel-to-earth ground Continuous ........................... 250 Vrms (Double insulation) Withstand .............................
Environmental National Instruments C Series modules are intended for indoor use only but may be used outdoors if installed in a suitable enclosure. Refer to the manual for the chassis you are using for more information about meeting these specifications. Operating temperature (IEC 60068-2-1, IEC 60068-2-2) ..... –40 to 85 °C Storage temperature (IEC 60068-2-1, IEC 60068-2-2) ..... –40 to 85 °C Operating humidity (IEC 60068-2-56)..............................
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 NI and the Environment Web page at ni.com/environment.
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