Update log and graph ONLY when gate value changes

[Janniebunny]

Hi there,

I have a number of sensors connected to a PLC which sends counter output to Winlog when triggered. I am only interested to log and if possible display the actual counter value and time it triggered, i.e. update the log and graph ONLY when the gate value changes. Even if I can log the counter and exact timestamp will help. How can this be done? Any pointers in the right direct will be highly appreciated.

Regards,
Jan