Hi :

I'm trying to create NC(1=Normal) type ALARM, but there is no such option to 

invert a signal as NC type alarm, does anybody has similar experience or tips

Tanks for your help 

Hello Lee,

on the HMI an alarm is active when trigger bit = 1. I don't know about a possibility to change this behaviour.

So either you have to invert the trigger bit on the PLC or have look here (even it is in the German part of the Forum) when you need to solve it on the HMI.

Regards,

Frink

Thank you experts, since there are not many point, I invert signal in PLC, and use that to trigger alarm. But I'm sure that WinCC Classic is able to invert alarm in alarm setting, but HMI does not'.