FP 1601 with PXI RT

[cdsenthil]

Hi,

I am working in a system where there are about 34 FP1601 banks and a determistic data logging is required. The system also has a PXI RT system. All the FP banks and the PXI RT are connected in the same network.

The intention is to log the data continiously on the PXI RT collecting the data from 34 FP banks.

The FP Read funtion doesnot get downloaded to the RT, hence a network read funtion was used to read the data from FP banks.

The network read funtion however throws up error after sometime or gives absurd values.

The data however update correctly in MAX  loaded in a windows PC.

It would be great help if some one could provide a solution!!

[Brian_K.]

Hi cdsenthil,

You said that the FieldPoint Network Read.vi gives you funny errors. 

1)  Is there a error code that goes with the error? 

2) Is there a special case in which the error occurs?

3)  You said that MAX can accuratily measure voltages from the FieldPoints.  Can you run code on your host computer, that does similar actions to what your PXI-RT system does?

[cdsenthil]

Thanks Brain,

The FP Network Read as such does not give any error codes but returns zero or absurd non zero values (sorry for the confusion).

The system seems to work fine if the number of network modules that are accessed is low say one or two modules. As the number of channels or number of modules accessed increases the problem occurs.

The systems response is also very slow. when a thermocouple is removed from the TC 120 module, the read a very high value (indicating open TC) in the FP Network Read vi takes a long time even few minutes sometimes. The response in MAX is absolutely fine.

Even in the windows system the FP Network Read function has the same behaviour, however the FP Read funtion works perfectly fine.

[Brian_K.]

How fast are you reading your modules in your program.  What is your loop rate?  You may want to open the Real-time system manager to see how much of your CPU is being used.  Can you isolate down exactly what VIs start to cause the slowdown?