Block Types - Siemens S5-100U User Manual

Simatic s5 programmable controller

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Block Types

The following table lists the most important characteristics of the individual block types:

OB0 to OB255

Length (max.)

Length (max.)

Length (max.)

tion methods

Block header

The operating system calls up particular OBs automatically (see section 7.3.1 and 9.3).

Function blocks are already integrated into the operating system (see section 9.2).

Data blocks DB0 and DB1 are reserved.

EWA 4NEB 812 6120-02

Table 7-2. Comparison of Block Types

PB0 to PB255

SB0 to SB255

FB0 to FB255

Introduction to STEP 5

DB2 to DB255

256 data words

Bit patterns,

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