OPERATING INSTRUCTIONS AND SPECIFICATIONS
NI 9476
32-Channel, 24 V, Sourcing Digital Output Module
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This document describes how to use the National Instruments 9476 and includes specifications and pin assignments for the NI 9476. 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 9476. 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. Visit ni.com/info and enter cseriesdoc for information about C Series documentation.
NI 9476 Operating Instructions and Specifications |
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Safety Guidelines
Operate the NI 9476 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.
Safety Guidelines for Hazardous Locations
The NI 9476 is suitable for use in Class I, Division 2, Groups A, B, C, D, T4 hazardous locations; Class I, Zone 2, AEx nC IIC T4, and Ex nC IIC T4 hazardous locations; and nonhazardous locations only. Follow these guidelines if you are installing the NI 9476 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.
© National Instruments Corp. |
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NI 9476 Operating Instructions and Specifications |
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 between the external power supply and the Vsup pin. The device must prevent the Vsup-to-COM voltage from exceeding 50 V if there is a transient overvoltage condition.
Special Conditions for Hazardous Locations Use in Europe
This equipment has been evaluated as EEx nC IIC T4 equipment under DEMKO Certificate No. 03 ATEX 0324020X. Each module is marked 
II 3G and is suitable for use in Zone 2 hazardous locations. If you are using the NI 9476 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.
NI 9476 Operating Instructions and Specifications |
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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.
© National Instruments Corp. |
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NI 9476 Operating Instructions and Specifications |
Connecting the NI 9476
The NI 9476 has a 37-pin DSUB connector that provides connections for 32 digital output channels.
DO16 |
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1 |
DO0 |
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2 |
DO1 |
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DO17 |
21 |
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3 |
DO2 |
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DO18 |
22 |
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4 |
DO3 |
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DO19 |
23 |
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5 |
DO4 |
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DO20 |
24 |
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6 |
DO5 |
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DO21 |
25 |
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7 |
DO6 |
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DO22 |
26 |
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8 |
DO7 |
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DO23 |
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 |
DO8 |
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DO24 |
30 |
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12 |
DO9 |
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DO25 |
31 |
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13 |
DO10 |
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DO26 |
32 |
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14 |
DO11 |
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DO27 |
33 |
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15 |
DO12 |
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DO28 |
34 |
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16 |
DO13 |
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DO29 |
35 |
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17 |
DO14 |
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DO30 |
36 |
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18 |
DO15 |
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DO31 |
37 |
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19 |
COM |
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Figure 1. NI 9476 Pin Assignments
NI 9476 Operating Instructions and Specifications |
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Each channel has a DO pin to which you can connect a digital input device. The 32 digital output channels are internally referenced to COM.
You must connect an external power supply to the NI 9476. The power supply provides the current for the output channels. Connect the positive lead of the power supply to the supply pin, Vsup, and the negative lead of the power supply to the common pin, COM. Refer to the Specifications section for information about the power supply voltage range.
Note The Vsup pins are internally connected. You can connect only one external voltage supply to the device.
Caution Do not remove or insert modules if the external power supply connected to the Vsup and COM pins is powered on.
The NI 9476 has current sourcing outputs, meaning the DO pin is driven to Vsup when the channel is turned on.
© National Instruments Corp. |
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NI 9476 Operating Instructions and Specifications |
You can directly connect the NI 9476 to a variety of industrial devices such as solenoids, motors, actuators, relays, and lamps. Make sure the devices you connect to the NI 9476 are compatible with the output specifications of the module. Refer to the Specifications section for more information about the output specifications.
Connect the device to DO and COM, and connect the external power supply to Vsup and COM, as shown in Figure 2.
Vsup |
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DO |
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External |
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Power |
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Device |
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Supply |
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COM
NI 9476
Figure 2. Connecting a Device to the NI 9476
NI 9476 Operating Instructions and Specifications |
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