Need help please to realize a pop up window with confirmation buttons OK and Cancel when a user chose to shut down a system pressing button on HMI.

thanks for your interest, i don't know what faceplates are, but until now i've realized pop up messages 

using visibilities.

The problem is related now with button pressing actions, 'cause i have 2 buttons that activate 2 machines. Is there a way to inhibit a button action for a fixed period of time while the other button is just pressed and a message is temporary visualized on HMI?

What i've done is to put a NC contact at beginning of network just before NA contact linked to button1.

the NC contact becomes open when the user press the button2, so button1 cannot do anything.

The problem is due to the fact that after button1 i have P_TRIG and N_TRIG to intercept the 0-1 and 1-0 transactions, so despite to the fact that no action is performed by button1, its own state change anyway, so after the NC contact closes again it causes mistake actions with P_TRIG and N_TRIG..

Thanks Again

In WinCC RT Professional v11 you can use a windows in the layer number 31 and set visibility with a bit (let's say a tag called "Visible" type bool). Now, if you set the bit, your windows appears, now you'll want close it from the "x" in the windows and you will note that our bit ("Visible") is still activated. But if you reset the bit and set it again, the windows will appears one more time. Finally, you can "reset and set" the bit every time the window should appear and your pop up is ready!

Sorry about my english and good luck.