cancel message display

[jpraffer]

Hi,

    I am using labview 8.6. I am using a display message to user and i am using a D/I through the daq to activate it. the signal will remain at the daq but i want to be able to acknowledge (ie OK ) the message and for it to disappear even when the input is still high.

Backround: labview is controlling a transistor that controls 12V to a pump. when the system is pumping then message is also activated. The message is always active on the screen because the input is always high during the pump operation even when i ok or cancel.

how do i get the message to be acknowledged?

any help would be appreciated.

j

[James_W]

You could use 2 lines, 1 for set the message status, 1 for acknowledge.

You have to ensure you don't send the message twice because you have already acknowledged it but not cleared it. - There is the potential of a race condition here if you are not careful with your logic - i.e. don't send a message when one is already flagged as sent.

James

[tbob]

Try this vi.  If pump is off, no message is displayed.  If pump goes on, message is displayed.  Pressing OK button on message pop-up sets the Ack flag.  The message will no longer pop-up.  When pump goes off, Ack gets reset so that the next pump on will cause a message display.

[jpraffer]

thanks bob. thats great help. I will need to play around it to run the pump and the message from the same switch.

j

[tbob]

You can use a two button dialog if you need to act on OK or Cancel buttons.