Siemens Simatic S7-1500H, Системное руководство

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Configuration
6.5 Process images and process image partitions
S7-1500R/H redundant system
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System Manual, 10/2018, A5E41814787-AA
32 process image partitions
The CPU uses process image partitions to synchronize the updated inputs/outputs of
specific modules with specific parts of the user program.
In the S7-1500R/H redundant system, the overall process image is subdivided into up to 32
process image partitions (PIP).
The CPU automatically updates PIP 0 (automatic update) in each program cycle and assigns
it to OB 1.
You can assign other OBs to process image partitions PIP 1 to PIP 31 during configuration
of the IO devices.
Before the start of the OB, the CPU writes the outputs of the assigned process image
partition (PIPQ) straight to the peripheral outputs of the IO devices. The CPU then updates
the assigned process image partition for inputs (PIPI) and reads in the process signals.
The figure below illustrates the updating of a process image partition.
Figure 6-8 Updating a process image partition
6.5.2 Updating process image partitions in the user program
Requirements
Alternatively, you can also use the following instructions to update process images:
● "UPDAT_PI" instruction at the start of the assigned OB
● "UPDAT_PO" instruction at the end of the assigned OB
You will find the instructions in STEP 7 in the "Instructions" task card under "Extended
instructions". The instructions can be called from any point in the user program.
Requirements for updating process image partitions with the "UPDAT_PI" and "UPDAT_PO"
instructions:
● The process image partitions must not be assigned to any OB. This means the process
image partitions are not automatically updated.
Note
Update of PIP 0
PIP 0 (automatic update) cannot be updated with the "UPDAT_PI" and "UPDAT_PO"
instructions.