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Summary of Contents for National Instruments NI 9423
- Page 1 OPERATING INSTRUCTIONS AND SPECIFICATIONS NI 9421/9423 8-Channel Sinking Digital Input Modules Français Deutsch ni.com/manuals...
- Page 2 National Instruments 9423 and includes specifications and terminal assignments for the NI 9421/9423. In this document, the NI 9421 with screw terminal, NI 9421 with DSUB, and NI 9423 are referred to inclusively as the NI 9421/9423. Visit ni.com/...
- Page 3 60 VDC to earth ground. Ensure that hazardous voltage wiring is Caution performed only by qualified personnel adhering to local electrical standards. Do not mix hazardous voltage circuits and Caution human-accessible circuits on the same module. © National Instruments Corp. NI 9421/9423...
- Page 4 Make sure that devices and circuits connected to Caution the module are properly insulated from human contact. When module terminals are hazardous voltage Caution LIVE (>42.4 V /60 VDC), you must ensure that devices and circuits connected to the module are properly insulated from human contact.
- Page 5 AEx nC IIC T4, and Ex nC IIC T4 hazardous locations; and nonhazardous locations only. Follow these guidelines if you are installing the NI 9421/9423 in a potentially explosive environment. Not following these guidelines may result in serious injury or death. © National Instruments Corp. NI 9421/9423...
- Page 6 Do not disconnect I/O-side wires or connectors Caution unless power has been switched off or the area is known to be nonhazardous. Do not remove modules unless power has been Caution switched off or the area is known to be nonhazardous. Substitution of components may impair Caution suitability for Class I, Division 2.
- Page 7 Power supply and module cables must be separated on opposite sides of the enclosure and must enter and exit through opposing enclosure walls. © National Instruments Corp. NI 9421/9423...
- Page 8 Connecting the NI 9421/9423 The NI 9421/9423 provides connections for eight digital input channels. Figure 2. NI 9421/9423 Terminal and Pin Assignments NI 9421/9423 ni.com...
- Page 9 You can connect 2-, 3-, and 4-wire sourcing-output devices to the NI 9421/9423. A sourcing-output device drives current or applies voltage to DI. An example of a sourcing-output device is an open collector PNP. © National Instruments Corp. NI 9421/9423...
- Page 10 Connect the output of the sourcing-output device to DI on the NI 9421/9423. Connect the common of the external device to the COM terminal or pin. Refer to Figure 3 for an illustration of connecting a device to the NI 9421/9423. Sourcing-Output Device External...
- Page 11 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. © National Instruments Corp. NI 9421/9423...
- Page 12 Wiring for High-Vibration Applications If an application using the NI 9421/9423 with screw terminal is subject to high vibration, National Instruments recommends that you either use ferrules to terminate wires to the detachable screw-terminal connector or use the NI 9932 backshell kit to protect the connections.
- Page 13 In sleep mode, the system consumes minimal power and may dissipate less heat than it does in normal mode. Refer to the Specifications section for more information about power consumption and thermal dissipation. © National Instruments Corp. NI 9421/9423...
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Page 14: Specifications
The following specifications are typical for the range –40 to 70 °C unless otherwise noted. The specifications are the same for the NI 9421 and the NI 9423 unless otherwise noted. All voltages are relative to COM unless otherwise noted. - Page 15 I/O protection Input voltage NI 9421 ........ 40 V max NI 9423 ........ 35 V max Reverse-biased voltage ....–30 V max Input current NI 9421 ........ 7 mA max, internally limited NI 9423 ........ 8.5 mA max, internally limited Input delay time NI 9421........
- Page 16 NI 9423........979,623 hours at 25 °C; Bellcore Issue 2, Method 1, Case 3, Limited Part Stress Method Contact NI for Bellcore MTBF specifications Note at other temperatures or for MIL-HDBK-217F specifications. NI 9421 Power Requirements Power consumption from chassis Active mode .......
- Page 17 10 mm (0.39 in.) of insulation stripped from the end Torque for screw-terminals ....0.5 to 0.6 N · m (4.4 to 5.3 lb · in.) Ferrules ..........0.25 mm to 2.5 mm © National Instruments Corp. NI 9421/9423...
- Page 18 Weight NI 9421/9423 with screw-terminal ......150 g (5.3 oz) NI 9421 with DSUB....145 g (5.1 oz) Safety NI 9421/9423 with Screw-Terminal Safety Voltages Connect only voltages that are within the following limits. Channel-to-COM ......30 V max Isolation Channel-to-channel ....
- Page 19 Measurement Category I is for measurements performed on circuits not directly connected to the electrical distribution system referred to as MAINS voltage. MAINS is a hazardous live electrical supply system that powers equipment. This category is for © National Instruments Corp. NI 9421/9423...
- Page 20 measurements of voltages from specially protected secondary circuits. Such voltage measurements include signal levels, special equipment, limited-energy parts of equipment, circuits powered by regulated low-voltage sources, and electronics. Do not connect the NI 9421 with DSUB to Note signals or use for measurements within Measurement Categories II, III, or IV.
- Page 21 • EN 55011 (CISPR 11): Group 1, Class A emissions • AS/NZS CISPR 11: Group 1, Class A emissions • FCC 47 CFR Part 15B: Class A emissions • ICES-001: Class A emissions © National Instruments Corp. NI 9421/9423...
- Page 22 For the standards applied to assess the EMC of this Note product, refer to the Online Product Certification section. For EMC compliance, operate this device with Note double-shielded cables. CE Compliance This product meets the essential requirements of applicable European Directives as follows: •...
- Page 23 18 shocks at 6 orientations 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.
- Page 24 Maximum altitude......2,000 m Pollution Degree ....... 2 Environmental Management National Instruments 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.
- Page 25 WEEE recycling center. For more information about WEEE recycling centers and National Instruments WEEE initiatives, visit ni.com/ environment/weee National Instruments (RoHS) National Instruments RoHS (For information ni.com/environment/rohs_china about China RoHS compliance, go to ni.com/ environment/rohs_china © National Instruments Corp. NI 9421/9423...
- Page 26 Where to Go for Support The National Instruments Web site is your complete resource for technical support. At you have access to ni.com/support everything from troubleshooting and application development self-help resources to email and phone assistance from NI Application Engineers.
- Page 27 South Africa 27 0 11 805 8197, Spain 34 91 640 0085, Sweden 46 (0) 8 587 895 00, Switzerland 41 56 2005151, Taiwan 886 02 2377 2222, Thailand 662 278 6777, Turkey 90 212 279 3031, United Kingdom 44 (0) 1635 523545 © National Instruments Corp. NI 9421/9423...
- Page 28 National Instruments, NI, ni.com, and LabVIEW are trademarks of National Instruments Corporation. Refer to the Terms of Use section on ni.com/legal for more information about National Instruments trademarks. Other product and company names mentioned herein are trademarks or trade names of their respective companies.
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