1Introduction
Aims of the manual
This manual is intended to provide specialized information about
programming the CPU 948 for users who already have basic
knowledge of programming PLCs and want to use the CPU 948 in the
S5-155U programmable controller. If you do not yet have this basic
knowledge, we strongly advise you read the documentation
introducing the programming language STEP 5 /3/ or take part in a
course at our training center. SIEMENS provides comprehensive
training for SIMATIC S5. For more detailed information, contact your
local SIEMENS office.
Contents of Chapter 1
Chapter 1 explains how to use the manual and deals with the areas of
application of the S5-155U programmable controller with the
CPU 948 and its structure.
The chapter explains the typical mode of operation of a CPU and the
structure of the CPU program.
You will also find a few suggestions about how to tackle
programming and will learn some of the features of the CPU 948
which are important for programming.
If you have already worked with the CPU 946/947 and would like to
know the differences between these modules and the CPU 948, refer
to Section 1.8.
Chapter 1 also informs you about differences between versions A01
and A02 of the CPU 948 and explains points you should remember
when converting "928B" programs for the CPU 948.
CPU 948 Programming Guide
C79000-G8576-C848-04
1 - 3
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