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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.

Siemens SIMATIC IM 151/CPU User Manual

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