Run Sequence - Siemens SIMATIC PCS 7 Configuration Manual

8.2.4

Run sequence

Principle of the run sequence
A runtime group is created for every CFC chart (process tag) automatically upon creation. The
"Predecessor for runtime sequence" function in the runtime editor provides the option of
determining the installation position of the next CFC chart within a cyclic interrupt OB. All blocks
of a CFC chart are therefore assigned to the same cyclic interrupt OB. This ensures that the
channel drivers and technological blocks are processed in the same cycle in a runtime
sequence.
Note
If blocks with startup characteristics are included, these are also integrated in OB 100.
Execution time of the runtime groups
You can set the execution time of the process tags by inserting the corresponding runtime
group in one of the following cyclic interrupt OBs.
Cyclic interrupt OB
OB 30
OB 31
OB 32
OB 33
OB 34
OB 35
OB 36
Compendium Part A - Configuration Guidelines (V8.2)
Configuration Manual, 08/2016, A5E38166869-AA
Default value for time frame
5 s
2 s
1 s
500 ms
200 ms
100 ms
50 ms
Configuring AS functions
8.2 Creating process tags
Default value for priority class
7
8
9
10
11
12
13
169