Technical data

Establishing an Online Connection and Making CPU Settings
18.3 Displaying and Setting the Time and Date
Programming with STEP 7
410 Manual, 05/2010, A5E02789666-01
TOD Interrupts
OB 80 is called if TOD interrupts were not triggered due to the "Time jump" when standard time is
switched to daylight saving.
For daylight saving/standard time conversion the periodicity is maintained for TOD interrupts with
minute and hourly periodicity.
TOD Synchronization
A CPU that is configured as TOD Master (for example, in the CPU register "Diagnostics/Clock"),
always synchronizes other clocks with the Module Time and the current TOD status.