Siemens Simatic S7 Series System Manual page 310

Program instructions
7.13 Program control
Example: SCR convergent flow control
LAD
310
Beginning of state L control region Network 1
Transition to State L'
End of SCR region for state L
Beginning of state M control re-
gion
Transition to state M'
End of SCR region for state M
When both State L' and State M'
are activated:
Enable State N (S5.0)
•
Reset State L' (S3.5)
•
Reset State M' (S6.5)
•
STL
LSCR S3.4
Network 2
LD V100.5
SCRT S3.5
Network 3
SCRE
Network 4
LSCR S6.4
Network 5
LD C50
SCRT S6.5
Network 6
SCRE
Network 7
LD S3.5
A S6.5
S S5.0, 1
R S3.5, 1
R S6.5, 1
System Manual, 09/2015, A5E03822230-AC
S7-200 SMART