I/O Test Panel

Use the I/O Test Panel to read the current values of all I/O lines, quadrature encoders, and LEDs on NI frame grabbers or Smart Cameras. You can chart the values of the I/O signals by double-clicking on the signals of interest and clicking Start on the Monitor tab.

FAQs

Q: Why is my digital line not responding in the I/O Test Panel?

The digital line could not be responding if one of the following conditions is present:

• The output line is currently being used for pulse generation and the pulse is too fast to display the changing state.
• The output value for the digital output line is being overwritten by another step in the inspection. Verify that the digital output line is not being used by any other Read/Write I/O or Generate Pulse step in the inspection.

Q: Why does the quadrature encoder value for my NI PCI-1426 not appear in the test panel?

The value of the quadrature encoder for the NI PCI-1426 cannot be read.