Yes, this is how it should work, but now it seems that after the operator presses enter the timer actual value is occasionally very big time value. Even if i have set the time to MM or SS only it can take a time of hours or minutes even if the timer is only for seconds.
This Jazz is controlling wood chip boilers chip feedind system and combustion air blower. If we turn off the power shortly then it starts to count time from the correct value again, but the operator sometimes misses to turn off the power after setting the times. Now we are getting very cold weather here in Finland, so we need to tune the time values a lot until we get a balance of feed / consumption.
I have an idea of using fixed one second timer and to do the "timers" with counting these pulses until requred duration is elapsed.
