S5-100U Introduction to STEP 5
7.4.1 Program Processing with CPU 102
You can process the program in the following two modes:
• Normal mode
• Test mode
Program processing is faster in the normal mode, but you can not use the STATUS test function.
Transferring from one mode to the other is called a mode change.
Test Mode:
Scanning the STEP 5 program
Normal Mode:
The control program you have written in STEP 5 is not processed directly. What is processed is a
translated or runtime-optimized form of the program generated by the programmable controller.
Figure 7-9. Program Scanning with CPU 102
Control
program
in STEP 5
Transfer
data
Runtime-
optimized
program
Cycle trigger
Assemble
(compile)
Cycle trigger
Transfer
data
Test mode Normal mode
EWA 4NEB 812 6120-02
7-19
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