Siemens SIMATIC S7-200 System Manual page 191

In other situations, a control stream might be directed into one of several possible control streams,
depending upon which transition condition comes true first. Such a situation is depicted in Figure
6-34, which shows an equivalent SCR program.
Figure 6-34 Divergence of a Control Stream, Depending on the Transition Condition
Example: Conditional Transitions
State L
Transition Condition
State M
Network 1
LSCR S3.4
Network 2
LD M2.3
SCRT S3.5
Network 3
LD I3.3
SCRT S6.5
Network 4
SCRE
S7-200 Instruction Set
Transition Condition
State N
//Beginning of State L control region
//Transition to State M
//Transition to State N
//End of SCR region for State L
Chapter 6
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