Siemens SIMATIC S7-1200 - Page 189

Programming concepts
7.3 Using blocks to structure your program
S7-1200 Programmable controller
System Manual, V4.2, 09/2016, A5E02486680-AK
189
Creating additional OBs
You can create multiple OBs for your user program, even for the program cycle and startup
OB events. Use the "Add new block" dialog to create an OB and enter a name for your OB.
If you create multiple program cycle OBs for your user program, the CPU executes each
program cycle OB in numerical sequence, starting with the program cycle OB with the lowest
number (such as OB 1). For example: after the first program cycle OB (such as OB 1)
finishes, the CPU executes the program cycle OB with the next higher number.
Configuring the properties of an OB
You can modify the properties of an OB. For example, you can configure the OB number or
programming language.
Note
Note that you can assign a process image part number to an OB
that corresponds to PIP0,
PIP1, PIP2, PIP3, or PIP4. If you enter a number for the process image part number, the
CPU creates that process image partition. See the topic "
Execution of the user program
(Page
83)" for an explanation of the process image partitions.