Derives from the system time when calling OR-Motion screw on PXI controllers

Hello

Just an email to avoid others wasting time when they are facing in this fantasy bug:

We use PXI systems with Controllers NI PXI running Windows 7 and the 7340 family cards (PXI-7344). We have noticed that when the calls when it's through screws OR-Motion to question the different registers of the State (e.g. position, ADC value, general axis or the reference state) axis, the (Windows) system clock runs FASTER either. OR-Motion calls most are performed per second, faster windows clock works. When you get into the status for 4 axes 10 times per second (lines 100 ms rate), the drift is greater than 5%!

I include here an example of program that reproduces this behavior.

It is an essential question, for example if save you data with or from the timestamps, and it gets even worse if Windows is configured to periodically synchronize its own clock to a server via the NTP Protocol (it's how we noticed this problem in the first place). In this case, you see large discontinuities in your data every once in a while. Our systems must be running automatically and record data continuously throughout the year, so this bug is a real challenge.

People at NOR been able to reproduce this bug too and are working on it (no idea of any CAR # yet). Note that this problem has not been seen on a DC non - OR Office running Windows 7 64 bit...

The exact configuration is the following:

Chassis PXI-1036

PXI-8101 (or PXI-8102 on another system) controller

4 PXI-7340 axes into the Groove 4, no physical connection for this test

(PXI-6221 in slot 2, not used in this sample program)

Windows 7 Enterprise SP1 32-bit English

LabVIEW 2011 SP1 32-bit English

OR-Motion 8.3

2.6.2 PXI platform services

(all software OR additional distribution 2012 DS1)

Controller BIOS: improved 1.3.1 to 2.0.1f0, problem given the two versions of the BIOS

I'll try to post here as soon as we receive news of NEITHER.

Kind regards

Vincent

Advertisement

Hi all

I wanted to let you know that the driver OR Motion 8.4 coming should solve this problem.

Best regards

Tags: NI Hardware

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