Siemens Simatic S7-200 System Manual page 282

Instruction Set
Network 6
Network 7
SM0.0
Network 8
T38
Network 9
.
.
.
Figure 10-39 Example of Sequence Control Relays (SCRs), 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 10-40.
Figure 10-40
10-94
LAD
(Program continued from previous page)
S0.2
Beginning of State 2
SCR
control region
Q0.2
Turn on the green light
S
on Third Street.
1
T38
IN TON
Start a 25-second timer.
250 PT
S0.3
Transition to State 3
SCRT
after a 25-second delay.
End of SCR region for
SCRE
State 2
State L
State M
Divergence of Control Stream
Network 6
LSCR S0.2
Network 7
LD SM0.0
S Q0.2, 1
TON T38, 250
Network 8
LD T38
SCRT S0.3
Network 9
SCRE
.
.
.
Transition Condition
State N
S7-200 Programmable Controller System Manual
C79000-G7076-C230-02
STL