Time Of Day Ob; Status Ob - Siemens SIMATIC S7-1200 System Manual

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PLC concepts

5.1 Execution of the user program

Time of day OB

Time of day OBs execute based on configured clock time conditions. The CPU supports two

time of day OBs.

Time of day events

You can configure a time of day interrupt event to occur once on a specified date or time or

cyclically with one of the following cycles:

● Every minute: The interrupt occurs every minute.

● Hourly: The interrupt occurs every hour.

● Daily: The interrupt occurs every day at a specified time (hour and minute).

● Weekly: The interrupt occurs every week at a specified time on a specified day of the

week (for example, every Tuesday at 4:30 in the afternoon).

● Monthly: The interrupt occurs every month at a specified time on a specified day of the

month. The day number must be between 1 and 28, inclusive.

● Every end of month: The interrupt occurs on the last day of every month at a specified

● Yearly: The interrupt occurs every year on the specified date (month and day). You

cannot specify a date of February 29.

SecondTimes Bool

Status OBs execute if a DPV1 or PNIO slave triggers a status interrupt. This might be the

case if a component (module or rack) of a DPV1 or PNIO slave changes its operating mode,

for example from RUN to STOP.

Status events

For detailed information on events that trigger a status interrupt, refer to the manufacturer's

documentation for the DPV1 or PNIO slave.

Start information for a time of day event OB

OB call is caught up because time was set forward

OB call is started a second time because time was set backward

Start information for status OB

Hardware identifier

Alarm specifier

S7-1200 Programmable controller

System Manual, V4.2, 09/2016, A5E02486680-AK