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Chapter 3 Signal Connections

I/O Signals

Field Wiring Considerations

To prevent incorrect results caused by environmental noise and crosstalk,

make sure the NI 660x and the peripheral device share a common ground

reference. Connect one or more NI 660x device D GND lines to the ground

reference of your peripheral device.

You can also use the digital filters available on each PFI line to reduce

errors that these problems might cause.

Noise

For noise immunity, take the following precautions:

• When routing signals to the TIO device, keep cabling away from noise

sources.

• Separate the TIO device signal lines from high-current or high-voltage

lines. High-current or high-voltage lines that run in parallel paths at a

close distance can induce currents in or voltages on the TIO device

signal lines. To reduce the coupling between lines, separate parallel

lines by a reasonable distance or run the lines at right angles to one

another.

• Do not run signal lines through conduits that also contain power lines.

• Protect signal lines from magnetic and electric fields caused by

monitors, electric motors, welding equipment, breakers, transformers,

or other devices by running them through special metal conduits.

• Use appropriate digital filtering to remove noise.

National Instruments PCI-6601 User Manual

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