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3.5.3
Supplementary Operations
System operations
CPU 948 Programming Guide
C79000-G8576-C848-04
You can use the supplementary operations set on the programmer only
in function blocks (FB and FX). This means that the total operations
set for function blocks consists of the basic operations and the
supplementary operations.
The system operations also belong to the supplementary functions.
You can use the system operations, for example to overwrite the
memory at optional locations or to change the contents of the working
registers of the CPU. System operations can only be programmed if
they have been enabled in the presets menu of the programmer (no
longer necessary from S5-DOS Version 2.0 upwards).
If you intend to use system operations, you should be familiar with
Chapter 9 "Memory access".
Caution
Only experienced system programmers should use the system
operations and then only with extreme caution.
You can only write operations in function blocks in STL. You cannot
program function blocks in graphic form (LAD and CSF methods of
representation).
This section describes the supplementary operations and covers possible
combinations of substitution operations with actual operands.
System operations are marked in the first column of the
tables with
S
Supplementary Operations
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