"niSwitch Abort Scan.vi" takes a lot of time in scanning mode

[Tepig]

Following example is based on

C:\Program Files (x86)\National Instruments\LabVIEW 2017\examples\instr\niSwitch\Switch - Scanning - Software Scanning (NI-SWITCH).vi

Environment Information

• LabVIEW 2017
• niSwitch 17.0
• PXIe-8821 + PXIe-1078
• PXIe-8821 + PXIe-1082
• PXI-2567
• ScanList: ch0->com0

I have a question why "niSwitch Abort Scan.vi" takes a lot of time under scanning.

When "Wait Between START and ABORT" was set to 0, the VI took about 16msec.

When I increased the parameter to 50msec, it took 1.6msec, error "-1074126842" returned.

I guess under scanning, the VI takes a lot of time. But it too long...

Is this based on my coding problem or hardware/driver?

Can I decrease the process time?

At above settings, the scan should finish within 1-5msec I believe. When I set "Wait Between START and ABORT" to 0, the VI took 16msec but when I set the parameter 15msec, the situation wasn't changed. From this result, the scanning was not finished, it took over 15msec.

Does scanning require so many overhead?

FYI: Error "-1074126842"

"The switch module is currently in scanning mode, and the operation cannot be performed at this time."

<<Under Scanning, no error but takes ~16msec>>

<<Scanning stopped, fast but error returned>>

[Tepig]

On "Wait Between START and ABORT", 15msec is threshold...?

[Tepig · Accepted solution]

We concluded that NI Switch driver doesn't work fast.

It seems that it internally does some module/system check to guarantee the module health.

There is no way to make it fast.