National Instruments NI 9472, NI 9474 - page 10

NI 9472/9474 10 ni.com

You must connect an external power supply to the NI 9472/9474.

This power supply provides the current for the devices you connect

to the module. Connect the positive lead of the power supply to

Vsup and the negative lead of the power supply to COM. The Vsup

pins on the NI9472 with DSUB are internally connected. You can

connect only one external voltage supply to the device. Refer to the

Specifications section for information about the power supply

voltage range.

Caution Do not remove or insert modules if the external

power supply connected to the Vsup and COM pins is

powered on.

The NI 9472/9474 has current sourcing outputs, meaning the DO

terminal or pin is driven to Vsup when the channel is turned on.

Contents

Main Safety Guidelines Safety Guidelines for Hazardous Voltages Page Safety Guidelines for Hazardous Locations Special Conditions for Hazardous Locations Use in Europe Special Conditions for Marine Applications Connecting the NI 9472/9474 The NI 9472/9474 provides connections for eight digital output channels. Figure 2. NI 9472/9474 Terminal and Pin Assignments Page Page Page Increasing Current Drive Wiring for High-Vibration Applications I/O Protection Understanding Short-Circuit-Proof Devices Power Supplies and Overcurrent Conditions Detecting an Overcurrent Condition Resetting Channels After an Overcurrent Condition Sleep Mode Specifications Output Characteristics Page NI 9472 Power Requirements NI 9474 Power Requirements Physical Characteristics Safety NI 9472/9474 with Screw Terminal SafetyVoltages NI 9472 with DSUB Safety Voltages Safety Standards Hazardous Locations Environmental Shock and Vibration Electromagnetic Compatibility CE Compliance Environmental Management Waste Electrical and Electronic Equipment (WEEE) Where to Go for Support RoHS Page 373509E-01 May08