Communication Stops with Modbus Device

[shrekt]

Dear All,

Let me explain my set up first:

I am communicating with 3 modbus devices paralllely, means i have 3 while loops in parallel to read register.

After reading these register i am inserting the values in the database.

I am using 3 different vis for all 3 loops ( not reentrant).

Also i am opening & closing the visa and database connection in the loops.

The monitored the cpu usage and the memory, they are not increasing and are steady.

Problem: While i am running the above setup for a day then after about 16-20 hrs the program stops,

i am not understaning as 3 parallel loops are running with different vis, then also all the 3 loops does'nt respond.

Can anyone suggest anything,

Thank you in advance. 

Regards,

Shrek

[RavensFan]

Have you considered NOT opening and closing the resources within the loops?  If you are doing something repeatedly, then constantly opening and closing resources may be causing problems like a memory leak.

Are all 3 VI's accessing the same resource?  If so, you might want to create a VI that is a single point of access for a given resource and let the 3 parallel VI's all interact with that.

[PiMaster]

I'm giving a kudos for adverb invention.

[shrekt]

Thanks for the reply,

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Have you considered NOT opening and closing the resources within the loops?  If you are doing something repeatedly, then constantly opening and closing resources may be causing problems like a memory leak.

________________________________________________________________________________________________________________________________________

In some of the document from NI only i have read that the connection opened should be closed or the memory size will increase.

I am experiencing the problem of memory size increase when i am not closing the connection (in other application).

________________________________________________________________________________________________________________________________________

Are all 3 VI's accessing the same resource?  If so, you might want to create a VI that is a single point of access for a given resource and let the 3 parallel VI's all interact with that.

______________________________________________________________________________________________________________________________________

All the 3 loops contains Modbus master vi which polls for a specific device and inserts that value in the same database. I tried doing it with reentrant vi,

Calling the same (reentrant) vi in all the loops but the modbus comm. was giving error.

Regards,

Shrek