Stopped reading instruments

[Mouldsy]

We are running Labview V5 on our Relief Valve Flow Test, it reads from 3 Pressure Tranducers, 1 Temperature and a Differential Pressure Transducer. The program has suddenly stopped reading any of the instruments and we are unable to work out why. 

[RayFarmer]

Hi,

Are you running within the LabVIEW developement environment or as an EXE?

Are you getting any error reported?

Is that;

a) it was running, then stopped reading instruments.

b) it was running on a previous execution, but on a new execution it stops reading.

c) the system has been powered down for sometime but was previously working

Regards

Ray Farmer

[Mouldsy]

Ray,

We are running in the Labview developement enviroment. The system has been running fine for the last four years until this week, the last time we

used it was a month ago. The program itself still starts and runs but all the displays for pressure and temperature are reading zero, I have not seen

any errors reported.

The instruments have just recently come back from calibration so I know they are working ok, I'm not sure if it's the card in the PC or the Card that

the Instruments are connected too.

Regards,

Rob Moulds

[RayFarmer]

Hi,

Check that default instrument settings are the same as your top level VI expects, particular if you are not using default settings. Cal Houses tend to use Instrument default addresses and then dont return the addresses back to original settings

Do you trap on the error cluster from the Instrument Initialisation VIs. May be use some breakpoints or open up some lower level VI's to see what's going on.

How are you communicating with you instruments, RS232, GPIB, DAQ?

Regards

Ray Farmer

[LV_Pro]

What is your configuration? You say that you have a card in the PC connected to another card, you mention instruments, etc. For a card in the PC, if it is a National Instruments card you can use the Measurement & Automation explorer tool that installs with the DAQ drivers. As mentioned regarding external instruments, if they are addressable be certain that the addresses are correct. You say it worked until last week but you haven't used it for a month which is confusing. What is the time frame for the calibration vs when you detected the problem? Did it work before cal, after cal, a while after cal? What instruments, how are they connected, etc.?

P.M.

[Mouldsy]

Before we get too in depth I must explain that I am a novice with this software and didn't set it up I've have inherited it.

We are communicating using DAQ, I believe it's a PCI-M10-16E-4 I/O Board. The Pressure (IOMEGA PX223) and Temperature (5B37 Thermocouple) Instruments are wired to a carrier which is connected to the PCI Board in the PC.

The last time the equipment was used until this problem on Monday was about one month ago, everything worked ok. Previously to last month the program has been working on and off for four years. 

Where do I find the Instrument addresses?

Rob

[Stuart_R]

The Instrument addresses that have been assigned will show up inside MAX. Browse inside Devices & Interfaces and they should all appear below.