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