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help triggering sleep or log out after period of HMI inactivity

Dan Gray 2 years ago in IQANdesign • updated by Gustav Widén (System support) 2 years ago 2
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I'm working on an MD4 application that I would like to have automatically log out after a period of inactivity--meaning no human interaction with the MD4 touch screen. The concept would be similar to a screensaver that turns on after say 30 minutes of inactivity and requires a pin code to wake up. Is there any status code or anything else in the system that I could make use of? Would it be possible to have a System Information Channel with a Display Input Active value that is True any time the screen is being touched (ex MD4) or a button is being pushed (ex MD3)?

Thanks, Dan

One suggestion is to look at change of value on the system information channels "active display page" and "menu system open". This could be used to reset a TMR, and the value of TMR channel could be used in the reset function on a PCC.


A limitation compared to the status channel you are suggesting is that this method would not reset the timer if the user is only working in the menu system or only stays on the same display page.


The topic was posted as a private topic, would you mind if I move this to the questions or ideas section on the public forum?

For this project, the display page might not change even though the system is in use and the menu system will not be accessible without a pin code. I follow the idea though. I will look for some critical part and watch it. In my case, I can watch a motor signal or a valve solenoid signal .

Yes you can move this to a public forum. Thanks for the help.