Change detection in combination with additional digital input

[Alkali]

Hello everyone,

I am using change detection for several digital lines and am trying to create an additional task to read a different digital line periodically. However, when both tasks are started I get the following error message:

Specified route cannot be satisfied, because it requires resources that are currently in use by another route.

Property: DAQmx_SampClk_Src

Property: DAQmx_SampClk_ActiveEdge

Source Device: Dev1

Source Terminal: Change Detection Event

Required Resource in Use by

Source Device: Dev1

Source Terminal: PFI0

Destination Device: Dev1

Destination Terminal: di/SampleClock

Status Code: -89137

I am generating a clock using the card's frequency generator as a sample clock for counters and the digital input I'm trying to acquire. This freqout clock is routed to PFI0. The error message is not very explanatory to me, so I hope that somebody can help me with this error.

[Duffy2007 · Accepted solution]

Hello Alkali,

only one task with timing can be used for the digital inputs so only change detection or continuous input can be used.

How Many Different Tasks Can I Run On My Multifunction DAQ Card?

Why not make change detection for all or acquire all with a fast rate so every change is shown?