Divergence Of Control Stream - Siemens SIMATIC S7-200 System Manual

Network 5
Network 6
Network 7
SM0.0
SM0.0
Network 8
T38
Network 9
Figure 9-58 Example of Sequence Control Relays (SCRs) for SIMATIC LAD, STL, and
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.
Figure 9-59
S7-200 Programmable Controller System Manual
A5E00066097-02
SCRE
S0.2
SCRT
SCR
AND
1
+250
S0.3
SCRT SCRT
SCRE
FBD (continued)
State M

Divergence of Control Stream

FBD
End of SCR region for
State 1
Beginning of State 2
control region
Q0.2
Turn on the green light
S
on Third Street.
N
T38
Start a 25-second timer.
TON
IN
PT
Transition to State 3
after a 25-second delay.
End of SCR region for
State 2
State L
Transition Condition
State N
SIMATIC Instructions
9-161