Error 66 from MB master query

[sharmishtha]

Hi, I am getting error 66 after about a minute, when I am trying to read the temperature of a watlow controller using the MB ethernet master query VI inside a subVI. however, there is no error if I just try to read the temperature continuously. I increased the wait time to a ridiculously large 10 seconds, thinking that the controller was being pinged too much since i have multiple instances of the read-temperature subVI in my top VI, but to no avail. Any ideas for troubleshooting anyone? 

BTW, the controller is directly hooked up to the ethernet port of my laptop.

Thanks.

[sharmishtha]

If i am writing to and reading from the same controller within the same loop, do I need to delay the two operations? I am guessing the TCP close connection VI from either the read or the write does not execute properly before the other one tries to access the  controller. But if that is the case, this should happen from the very first iteration right? How come I am getting a few perfect iterations, and then suddenly error 66 is generated?

Sorry for multiple posts, but I have been wasting way too much time on this problem with no headway at all. Please can someone help? I dont want to post my VI as that has lot of sub-VIs so it might get complex; but I could if necessary.

[D_Biel]

1. Are you using a specific driver for your watlow instruments?

2. What NI are hardware are you using for your communication?

3. Could you provide more information about the error you are seeing? Is there more to the message? A screenshot would be helpful.

[sharmishtha]

Sorry for not replying earlier..thanks for your inquiry though...but I managed to solve my problem; I was missing a close TCP connection VI in one of my sub VIs. Thanks again.