Siemens SIMATIC S7-200 - Example of Convergence of Control Streams for LAD, STL, and FBD

SIMATIC Instructions
9-164
S7-200 Programmable Controller System Manual
A5E00066097-02
The convergence of control streams can be implemented in an SCR program by
making the transition from state L to state L’ and by making the transition from
state M to state M’. When both SCR bits representing L’ and M’ are true, state N
can the enabled as shown in Figure 9-62.
S
SCR
S5.0
S3.4
LAD STL
Network
LSCR S3.4
Network
Network
Beginning of State L
control region.
Enable State N.
S3.5
Network
Network
LD S3.5
A S6.5
S S5.0, 1
R S3.5, 1
R S6.5, 1
Network
. . .
. . .
S6.5
R
S3.5
Reset State L’.
SCRT
S3.5
Network
Transition to State L’.
V100.5
Network
LD V100.5
SCRT S3.5
Network
SCRE
SCRE
Network
End of SCR region for
State L.
SCR
S6.4
Network
LSCR S6.4
Beginning of State M
control region.
Network
Network
Network
. . .
. . .
SCRT
S6.5
Network
Transition to State M’.
C50
Network
LD C50
SCRT S6.5
Network
SCRE
SCRE
Network
End of SCR region for
State M.
1
1
R
S6.5
Reset State M’.
1
Figure 9-62 Example of Convergence of Control Streams for LAD, STL, and FBD