OPERATING INSTRUCTIONS AND SPECIFICATIONS
NI 9426
32-Channel, 24 V, Sourcing Digital Input Module
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This document describes how to use the National Instruments 9426 and includes specifications and pin assignments for the NI 9426. 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.
Note The safety guidelines and specifications in this document are specific to the NI 9426. The other components in the system might not meet the same safety ratings and specifications. Refer to the documentation for each component in the system to determine the safety ratings and specifications for the entire system.
Safety Guidelines
Operate the NI 9426 only as described in these operating instructions.
Hot Surface This icon denotes that the component may be hot. Touching this component may result in bodily injury.
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Safety Guidelines for Hazardous Voltages
If hazardous voltages are connected to the module, take the following precautions. A hazardous voltage is a voltage greater than 42.4 Vpk or 60 VDC to earth ground.
Caution Ensure that hazardous voltage wiring is performed only by qualified personnel adhering to local electrical standards.
Caution Do not mix hazardous voltage circuits and human-accessible circuits on the same module.
Caution Make sure that devices and circuits connected to the module are properly insulated from human contact.
Caution When module terminals are hazardous voltage LIVE (>42.4 Vpk/60 VDC), you must ensure that devices and circuits connected to the module are properly insulated from human contact.
Safety Guidelines for Hazardous Locations
The NI 9426 is suitable for use in Class I, Division 2, Groups A, B, C, D, T4 hazardous locations; Class I, Zone 2, AEx nA IIC T4, and
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NI 9426 Operating Instructions and Specifications |
Ex nA IIC T4 hazardous locations; and nonhazardous locations only. Follow these guidelines if you are installing the NI 9426 in a potentially explosive environment. Not following these guidelines may result in serious injury or death.
Caution Do not disconnect I/O-side wires or connectors unless power has been switched off or the area is known to be nonhazardous.
Caution Do not remove modules unless power has been switched off or the area is known to be nonhazardous.
Caution Substitution of components may impair suitability for Class I, Division 2.
Caution For Zone 2 applications, install the system in an enclosure rated to at least IP 54 as defined by IEC 60529 and EN 60529.
Caution For Zone 2 applications, install a protection device that prevents the Vsup voltage from exceeding 42 V if there is a transient overvoltage condition.
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Special Conditions for Hazardous Locations Use in Europe
This equipment has been evaluated as Ex nA IIC T4 equipment under DEMKO Certificate No. 07 ATEX 0626664X. Each module is marked 
II 3G and is suitable for use in Zone 2 hazardous locations. If you are using the NI 9426 in Gas Group IIC hazardous locations or in ambient temperatures of –40 °C ≤ Ta ≤ 70 °C, you must use the device in an NI chassis that has been evaluated as EEx nC IIC T4, Ex nA IIC T4, or Ex nL IIC T4 equipment.
Special Conditions for Marine Applications
Some modules are Lloyd’s Register (LR) Type Approved for marine applications. To verify Lloyd’s Register certification, visit ni.com/certification and search for the LR certificate, or look for the Lloyd’s Register mark on the module.
Caution To meet radio frequency emission requirements for marine applications, use shielded cables and install the system in a metal enclosure. Suppression ferrites must be installed on power supply inputs near power entries to modules and controllers. Power supply and module cables must be separated on opposite sides of the enclosure and must enter and exit through opposing enclosure walls.
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NI 9426 Operating Instructions and Specifications |
Connecting the NI 9426
The NI 9426 has a 37-pin DSUB connector that provides connections for 32 simultaneously-sampled digital input channels.
DI16 |
20 |
1 |
DI0 |
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2 |
DI1 |
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DI17 |
21 |
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3 |
DI2 |
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DI18 |
22 |
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4 |
DI3 |
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DI19 |
23 |
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5 |
DI4 |
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DI20 |
24 |
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6 |
DI5 |
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DI21 |
25 |
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7 |
DI6 |
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DI22 |
26 |
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8 |
DI7 |
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DI23 |
27 |
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9 |
Vsup |
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Vsup |
28 |
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10 |
Vsup |
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Vsup |
29 |
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11 |
DI8 |
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DI24 |
30 |
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12 |
DI9 |
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DI25 |
31 |
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13 |
DI10 |
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DI26 |
32 |
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14 |
DI11 |
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DI27 |
33 |
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15 |
DI12 |
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DI28 |
34 |
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16 |
DI13 |
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DI29 |
35 |
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17 |
DI14 |
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DI30 |
36 |
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18 |
DI15 |
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DI31 |
37 |
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19 |
NC |
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Figure 1. NI 9426 Pin Assignments
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