Siemens SIMATIC S7-200 - Divergence of Control Stream

SIMATIC Instructions
9-161
S7-200 Programmable Controller System Manual
A5E00066097-02
FBD
Beginning of State 2
control region
Turn on the green light
on Third Street.
Start a 25-second timer.
Transition to State 3
after a 25-second delay.
End of SCR region for
State 2
Network 6
S0.2
SCRT
SCR
AND
SM0.0
SM0.0
S
N
Q0.2
1
TON
IN
PT
T38
+250
Network 7
Network 8
S0.3
SCRT
T38
SCRT
Network 9
SCRE
Network 5
SCRE
End of SCR region for
State 1
Figure 9-58 Example of Sequence Control Relays (SCRs) for SIMATIC LAD, STL, and
FBD (continued)
Divergence Control
In many applications, a single stream of sequential states must be split into two or
more different streams. When a stream of control diverges into multiple streams,
all outgoing streams must be activated simultaneously. This is shown in
Figure 9-59.
State L
State M State N
Transition Condition
Figure 9-59 Divergence of Control Stream