one repetition loop

[Dustyboy]

Hi, i need error message to occur only the first time it appears.See attached file.When error occurs in string it pops up errormessage, but it keeps repeating each time it sens  the correct  string /Match.What is best way to handle this case? any suggestions? Thanks.

[JChec]

If I understand your problem correctly... you could just put the 'display message to user' in a case statement with a flag that goes false once the message has already displayed.

JChec

Message Edited by JChec on 10-02-2009 01:38 PM

[Dustyboy]

Close to solution, but it cant be like this because i have to set the flag everytime i start the test.I need it to be automatically but just once.Now it is just once (fine) but needs to be set each time.

[LV_Pro]

Not sure what you mean that you need to set the flag each time you start the test. How do you start a test? Can you not use that "signal" to also reset the "first error" flag?

[Dustyboy]

It is in a rs-232 communication.It "senses" when a error is inside communication and it pops the message, but next time i start the test again i need to turn on the flag to have it activated again or else nothing happens.

[F._Schubert]

If you have a loop, place the flag on a shift register. Initialize the SR with false. It is much better codeing than using a FP control for the flag.

Felix

[LV_Pro · Accepted solution]

As the previous poster suggests, put the flag in a shift register, which is reset by whatever boolean you start the test with. See attached.