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Siemens SIMATIC S7 System Manual

Siemens SIMATIC S7
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Program instructions
7.6 Counters
S7-200 SMART
System Manual, V2.3, 07/2017, A5E03822230-AF
255
Example CTD count down
LAD
STL
Count down counter C1 current value
counts from 3 to 0
With I0.1 OFF, I0.0 OFF-ON decre-
ments C1 current value
I0.1 ON loads countdown preset value
3
Network 1
LD I0.0
LD I0.1
CTD C1, +3
C1 bit is ON when counter C1 current
value = 0
Network 2
LD C1
= Q0.0
Timing diagram

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Siemens SIMATIC S7 Specifications

General IconGeneral
BrandSiemens
ModelSIMATIC S7
CategoryController
LanguageEnglish

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