What's the simplest way to program my ISY994i to turn off my garage lights after they have been on for 15 minutes? 2477D just installed along with my 50+ other Insteon devices but have never ran across this need. 

I bet I can answer this one!  Include what ever triggered the light in the IF section, then use the "wait" command in the THEN section for 15 minutes, then the "off" command?

I agree with redridge.  I will add that one needs to be careful to avoid having the THEN section retrigger the IF section but, otherwise, it should be as simple as described.

Are you concerned only about when the garage lights are manually turned on, or are there other automated cases that might cause your lights to be on?

I do that with a bathroom fan so it doesn't run forever:

Bath Fan - [ID 008A][Parent 0062]

If
        'Rooms / Kitchen / Kitchen BathRoom Fan' is switched On
 
Then
        Wait  3 minutes 
        Set 'Rooms / Kitchen / Kitchen BathRoom Fan' Off
 
Else
   - No Actions - (To add one, press 'Action')
 

Thanks to all! I will implement today! This switch is only turned on manually, so, this should be a simple fix!

Thanks to all! I will implement today! This switch is only turned on manually, so, this should be a simple fix!

If you answer oberkc's question it may change the method of condition in the program.

The one given will not detect if the light us turned on from other sources.

Sent using Tapatalk

Got it! It is only turned on manually.