DAQmx Timing Property Node: SampClk.Timebase.Src / Rate not visible in Property Selection despite correct node and task wiring

[ansc2767]

Problem Description

I am trying to synchronize two NI-DAQmx tasks that run on different C Series modules with different sample rates (Delta-Sigma module + slow sampled module), following NI’s recommended approach.

According to NI documentation, this requires configuring the following properties via a DAQmx Timing Property Node:

• SampClk.Timebase.Src
• SampClk.Timebase.Rate
• SampClk.Rate

However, I am not able to access these properties in LabVIEW, even though I am using the correct node and wiring.

What I have already verified

• I am using DAQmx Timing Property Node
• The node is wired with a valid DAQmx Task wire (violet wire) coming from: DAQmx Create Channel, followed by DAQmx Timing (Sample Clock)
• The hardware is recognized and working

Observed Behavior

When I right-click the DAQmx Timing Property Node and choose Select Property…, I only see:

Properties

 └─ Sample Clock

    └─ Write Waveform

       └─ Use Initial Waveform dt

The properties:

• SampClk.Timebase.Src
• SampClk.Timebase.Rate

do not appear in the property tree.

If I use the Class Browser Search and search for:

• Timebase
• SampClk.Timebase
• Timescale

the properties appear in the search results (e.g. Advanced: First Sample Clock Time: Timescale), but after clicking OK they are not inserted into the property node, and the node still shows only the Write Waveform property.

Questions

1. Under which conditions are SampClk.Timebase.Src and SampClk.Timebase.Rate exposed in the DAQmx Timing Property Node?
2. Are these properties: device-, module-, driver-version dependent?
3. Is there an alternative supported way to set the Sample Clock Timebase for C Series modules if these properties are not visible?

Environment

• LabVIEW: LabVIEW 2025 Q3 (64-bit)
• NI-DAQmx: 2025 Q3
• Hardware:
• NI-cRIO-9049
• Delta-Sigma module: 9232
• Slow sampled module: 9219

[ansc2767]

Solution / Update

I was able to resolve the issue.

The problem was not the DAQmx Timing Property Node itself, but the project context.
Originally, my VI was not part of a proper LabVIEW Project (.lvproj).

After creating a new LabVIEW Project and then placing my VI inside this project, the correct DAQmx Timing properties (including SampClk.Timebase.Src and SampClk.Timebase.Rate) became available in the property node.