Methods Of Representation - Siemens S5-100U User Manual

Introduction to STEP 5
Each method of representation has its own special characteristics. A program block that has been
programmed in STL cannot necessarily be output in CSF or LAD. The three methods of graphic re-
presentation are not compatible. However, programs in CSF or LAD can always be converted to
STL. Figure 7-1 illustrates these points in a diagram.
Figure 7-1. Compatibility of STEP 5 Methods of Representation
The STEP 5 programming language has the following three operation types:
• Basic
• Supplementary
• System
Table 7-1 provides further information about these operations.
Application
Methods of
representation
Special features
Refer to Chapter 8 for a description of all operations and for programming examples.
7-2
CSF
STL
Table 7-1. Comparison of Operation Types
STEP 5 PROGRAMMING LANGUAGE
Basic Operations
In all blocks
STL, CSF, LAD
LAD
Supplementary
Operations
Only in function blocks
STL
S5-100U
System Operations
Only in function blocks
STL
For users with good
system knowledge
EWA 4NEB 812 6120-02