Archived: Using Internal Analog Input Channels in Traditional NI-DAQ (Legacy)This document has been archived and is no longer updated by National Instruments
Hardware: Multifunction DAQ (MIO)
I would like to test my E Series Multifunction (MIO) data acquisition device to verify that the analog outputs and analog inputs are working. Are there any special Virtual Channels I could use for diagnostics?
I would like to monitor the voltage at the analog output pins (DAC0OUT, DAC1OUT) of my E Series data acquisition device. Can I internally acquire the analog output voltage without external wiring?
This KnowledgeBase describes the use of internal analog input channels in Traditional NI-DAQ (Legacy). These special channels require no external connections and provide an easy way to test the analog inputs and outputs of an E Series measurement device. They can also be used to monitor analog output voltage without the need to wire the output back to an input pin.
Note: For information on performing this type of operation in NI-DAQmx please refer to KnowledgeBase 3L9G7246: Read the Value of Analog or Digital Output Channels.
There are several internal analog input Virtual Channels that can be used to run diagnostics on the analog output and analog input capabilities of any E Series multifunction (MIO) measurement device. They are also useful as a means to acquire the voltage at the analog outputs without using any analog inputs.
Internal analog input channels are routed using an internal switching matrix, so no wiring or cabling is required. The table below lists the most commonly used internal analog input channels. Not all devices support these internal analog inputs. For a more detailed list of the channels your device supports, see the Hardware Capabilities section of the LabVIEW Help file. If you are programming with NI-DAQ function calls, refer to the DAQ Device Internal Analog Input Channels section of the NI-DAQ Help file.
Note: When programming with NI-DAQ function calls, you should use the NI-DAQ Constants in your programs; do not use the Numeric Channels. These constants are defined in the NI-DAQ constants include file (
Analog Input/Output Self-Diagnostics Example
Because no external connections are required, internal analog inputs provide a convenient means to verify the operation of your E Series measurement device. In this example, we test a PCI-MIO-16E-1 device by generating a sine wave on the analog output and then use an internal analog input to verify the sine wave.
KnowledgeBase 3L9G7246: Read the Value of Analog or Digital Output Channels
DAQ Support: Online E Series Diagnostic Utility (Legacy)
Data Acquisition Support
KnowledgeBase KB 563B1D3A: How do I Access Internal Channels on my DAQ Device using DAQmx?
Report Date: 01/29/2001
Last Updated: 01/31/2017
Document ID: 25S9MQED