Siemens SIMATIC IM 151/CPU

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