HS/FS Logic in a known state after HS reboot

[Warichet]

Hi,

I'm creating an alarm system based on existing sensors.
The system works fine, except that the alarm is triggered the first time after reboot.
So I need to reset my logic for 2 min after reboot.
The question is: how can I do that ?

I thought about a timer, preset for 2 min, but how can I trigger the timer just after reboot ?

I seem to remember the iKO "System" could be used for that purpose, but don't remember which/what.

Maybe a hint ?

Thank you.

[Taxus]

Hi Raymond,
the "System"-iKO is placed in Interne Objekte / System / System (nach Start immer 1).
Combined with the 'Sperre' you get the results you want.

[Warichet]

Hi Rainer,

Thank you for the pictures.

Combined with the 'Sperre' you get the results you want.

If I get you right, on the first picture, the output is=0 from t0 until t0+59sec and becomes=1 after t0+60sec and remains on. Right ?

In fact, the "Sperre" is just an AND gate ?

Thank you

[Taxus]

The Boot+1- and Boot+2-objects are not remanent, have an initial value of zero, and they are triggered once (and then have the value 1), so, "yes" to your first question.

The Sperre is not an AND: when E1 changes, no value will be sent.

[Warichet]

The Boot+1- and Boot+2-objects are not remanent, have an initial value of zero, and they are triggered once (and then have the value 1), so, "yes" to your first question.

It turned out that it wasn't a problem of logic state after reboot
The standard "Sperre" is "pass though" by default (initial value=1=offen), so I've simply re-written it to be "blocking" by default (initial value=0=closed).

Seems to work.

Thank you for your kind help.