Siemens SIMATIC S7-200 - Example of Conditional Transitions for LAD, STL, and FBD

SIMATIC Instructions
9-166
S7-200 Programmable Controller System Manual
A5E00066097-02
In other situations, a control stream may be directed into one of several possible
control streams, depending upon which transition condition comes true first. Such
a situation is depicted in Figure 9-63.
State L
State M State N
Transition Condition Transition Condition
Figure 9-63 Divergence of Control Stream, Depending on Transition Condition
An equivalent SCR program is shown in Figure 9-64.
SCRT
SCR
S3.5
S3.4
SCRE
LAD STL
Network
LSCR S3.4
Network
Network
Network
Beginning of State L
control region.
Transition to State M.
End of SCR region for
State L.
M2.3
Network
Network
LD M2.3
SCRT S3.5
Network
LD I3.3
SCRT S6.5
Network
. . .
. . .
SCRT
S6.5
Transition to State N.
I3.3
Network
SCRE
Network
Figure 9-64 Example of Conditional Transitions for LAD, STL, and FBD