Technical data

SFCs for Handling Time-of-Day Interrupts
System Software for S7-300/400 System and Standard Functions - Volume 1/2
A5E00709327-01
9-3
Executing the Time-of-Day Interrupt OBs
The following table shows the different effects of the "execution" parameter. You
set this parameter with STEP 7 or with SFC 28 "SET_TINT" (input parameter
PERIOD).
Execution of the Time-of-Day
Interrupt OBs
Reaction
None
(can only be set with STEP 7)
The time-of-day interrupt OB is not executed even when it exists in the
CPU.
Parameters can be re-assigned in the user program using SFC 28
"SET_TINT" (set time-of-day interrupt).
Once The time-of-day interrupt is canceled after the time-of-day interrupt OB
has been called. It can then be set and activated again.
Periodic
(every minute, hour, day, week,
month, year)
If the start date and time have already passed when the interrupt is
activated, the time-of-day interrupt OB interrupts the cyclic program at
the next possible point "start date/time + multiple of the selected period."
In extremely rare situations, processing of the time-of-day interrupt OB
may not yet be completed when it is called again.
Result:
• Time error, (the operating system calls OB80; if OB80 does not
exist, the CPU changes to STOP).
• The time-of-day interrupt OB is executed later.