Siemens SIMATIC PCS 7 Configuration Manual page 87

Process control system compendium part a - configuration guidelines v8.2
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Configuration is performed in the following three steps:
1. CPU properties:
Assign one of up to 15 free process image partitions to a cyclic interrupt OB
(e.g. OB 35 – 100 ms)
2. Module properties:
Assign the module addresses to a process image partition and thereby to the desired cyclic
interrupt OB
3. CFC chart:
Installation of the channel blocks in the cyclic interrupt OB which belongs to the process
image partition
The process image partition is automatically updated by the cyclic interrupt OB to which it was
assigned.
This ensures that the inputs really are read at the start of a cyclic interrupt OB (for example, a
controller is processed) and also that the outputs are written in accordance with the cycle (input
– process – output: IPO).
= Process image partition PIPx
Note
You can find background information about the relationship between process images and
process image partitions in the "SIMATIC Process Control System PCS 7 Engineering System"
(https://support.industry.siemens.com/cs/ww/en/view/109485969) manual, in the section
"Setting the process image".
If redundant IO modules are used, TPAs must be used.
Compendium Part A - Configuration Guidelines (V8.2)
Configuration Manual, 08/2016, A5E38166869-AA
If no process image partition is configured for OB 35 (the process image is updated in
OB 1 only), OB 35 is executed three times with the "old" process values, without having
direct influence on the process.
Configuration of the hardware (AS and I/O)
6.1 General CPU settings (H system and standard AS)
87

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