Plant changes in RUN - CiR
11.11 Effects on the process when re-configuring in RUN
CPU 410 Process Automation/CPU 410 SMART
System Manual, 05/2017, A5E31622160-AC
195
Operating system function
Effects
Time system
The timers continue running.
The cycles for time-of-day interrupt, cyclic interrupt and time-
delay interrupt continue running but the interrupts them-
selves are locked. They are only received after the SDB
evaluation. This means, for example, that only one interrupt
can be added for each cyclic interrupt.
Programming device operation
Only the STOP command can be operated from the pro-
gramming device.
This means data record jobs are not possible.
External SSL information
Information functions are processed with a time delay.
11.11.2
Behavior of the CPU after download of the configuration in RUN
11.11.2.1
Overview
Sequence after download of the configuration in RUN
Once a modified configuration has been downloaded, CPU first checks whether your
changes are admissible. If they are, it evaluates the relevant system data.
This evaluation affects operating system functions such as process image updates and user
program processing. The details of these effects are set out below.
The fixed time for interpretation of system data by the CPU is referred to below as CiR
synchronization time.
The CPU enters the event W#16#4318 in the diagnostic buffer at the start and the event
W#16#4319 in the diagnostic buffer at the end of system data evaluation.
Note
If a Power Off occurs or the CPU switches to STOP during system data evaluation, only a
warm restart or cold restart is then possible.
The CPU then starts OB 80 with the event W#16#350A and enters the duration of evaluation
in the OB start information. This allows you to use this time in the control algorithms in your
cyclic interrupt OBs, for example.
Note
Always make sure that OB 80 has been loaded to your CPU. Otherwise, the CPU will switch
to STOP when an OB 80 start event occurs.