Timing a heaters On and OFF period

Hello All, I'm looking for some help.

I have a machine with a heater in it. I am trying to record the ON time and OFF time, every time the heater operates.

It works like this, a N/C pressure switch at input (I1 is High) Label "Pressure Low", calls for the heater to be energized (Q1 is High). Label "Switch Heater ON"

If the heater is actually energized, then input (I2 is High) Label "Heater is ON"

When the pressure switch is N/O (I1 is Low) Label "Pressure High", the output (Q1 is Low) Label "Switch Heater OFF".

If the heater is actually de-energized, then input (I2 is Low) Label "Heater is OFF".

What I want to do is measure the time the heater is actually ON and actually OFF, and show the current and/or the last time on the TDE screen

E.g.

Current Heater ON time =

Current Heater OFF time =

Last Heater ON time =

Last Heater OFF time =

I feel its something to do with the Stopwatch Block, and/or Lap times.

I have spent most of the afternoon trying to get my head around it.

Any help would be much appreciated.

Soft Comfort 8.2.1
LOGO!8 FS4

Cheers

Thanks for the response,

Currently the heater is on for 4 Minutes and x seconds, and off for 3 Minutes and x seconds, so I guess seconds would be the way to go. However on startup from cold, the heater could be on for as long as 3 hours.

I don't need to know the time (E.g. On at 5.30pm, off at 5.35pm) I just need to know how long the heater was On, and how long it was Off.

I'm having a go again at it now, but I feel I'm just missing something.

Thanks in advance

I'm going to see if I can simplify what I actually need from this.

The timing is for testing, so maybe I can use a selector switch or a function button.

Back asap

You are a genius, that is perfect.

Thank you so much for your time and effort.