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Ladder Logic (LAD) for S7-300 and S7-400
C79000-G7076-C504-02
PROJ1\...\FB53-<Offline>
”lampon””sensor1” ”button2”
Symbol Information:
I0.0 sensor1 Temperature exceeded
I1.2 button2 Acknowledge button
Q4.0 lampon Alarm signal
Network 1 : Output alarm
An alarm is output when the temperature limit is exceeded and the
message is not acknowledged
Figure 3-15 Symbol Information in Ladder
When you print the block, the printout is the same as the current screen
followed by the corresponding instruction and symbol comments.
Note
When you download a program to the CPU, the symbol table is not
downloaded. This means that when you are editing a user program whose
original is not on the programming device or PC, the original symbols are no
longer available.
Creating Logic Blocks
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