Siemens SIMATIC ET 200pro - Assign Process Image Partitions to an ob

Configuring
5.2 Configuring the CPU
CPU 1516pro-2 PN (6ES7516-2PN00-0AB0)
46 Operating Instructions, 11/2019, A5E35873416-AC
32 process image partitions
By means of process image partitions, the CPU synchronizes the updated inputs/outputs of
particular modules with defined user program sections.
For the CPU 1516pro-2 PN, the overall process image is subdivided into up to 32 process
image partitions (PIP).
The CPU updates PIP 0 (automatic update) automatically in each program cycle and assigns
it to OB 1.
You can assign the process image partitions PIP 1 to PIP 31 to the other OBs during
configuration of the input/output modules.
The CPU always reads the process image partition of the inputs (PIPI) before processing the
associated OB. The CPU outputs the process image of the outputs (PIPQ) at the end of the
OB.
The figure below illustrates the updating of a process image partition.
Figure 5-12 Update process image partition
5.2.3.2 Assign process image partitions to an OB
Update process image partition
You can assign a process image partition to an OB. In this case, the process image partition
is automatically updated.
The CPU always reads the process image partition of the inputs (PIPI) before processing the
associated OB. The CPU outputs the process image of the outputs (PIPQ) at the end of the
OB.
The figure below illustrates the updating of a process image partition.
Figure 5-13 Update process image partitions