Overview Of The Blocks - Siemens SIMATIC IM 151/CPU Manual

5.6 Blocks
This section provides an overview of the blocks that run in the CPU component of
the IM 151/CPU.
The operating system of the CPU is designed for event-driven processing of the
user program. The following tables show which organization blocks (OBs) the
operating system automatically invokes in response to which events.
More Information
You will find a detailed description of the blocks and the start events listed below in
the System and Standard Functions Reference Manual. There is an overview of all
the STEP 7 documentation in the ET 200S Distributed I/O System manual.
Overview of All the Blocks
Table 5-8

Overview of the Blocks

Block Number
OB 13
FC 128
FB 128
DB 127
SFC 48
SFB 7
ET 200S Interface Module IM 151/CPU
A5E00058783-01
Area Maximum Size
– 8 KB
0 – 127
0 – 127
1 – 127
–
–
– –
Functions of the IM 151/CPU
Remarks
All the possible OBs are listed below this
table.
–
–
0 is reserved
You will find a list of all the SFCs of the CPU
component in Appendix C.1.
You will find a list of all the SFBs of the CPU
component in Appendix C.2.
5-13