Siemens SIMATIC S7-200 - Page 348

SIMATIC Instructions
9-160
S7-200 Programmable Controller System Manual
A5E00066097-02
SCRT
SCR
S0.3
S0.2
SCRE
S
Q0.2
LAD STL
Network 6
LSCR S0.2
Network 7
Network 8
Network 9
SM0.0
1
TON IN
PT
T38
250
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
T38
Network 6
Network 8
LD T38
SCRT S0.3
Network 9
SCRE
.
.
.
Network 7
LD SM0.0
S Q0.2, 1
TON T38, 250
.
.
.
FBD
S
N
Network 1
S0.1
SM0.1
1
Network 2
S0.1
Network 3
AND
SM0.0
SM0.0
S
N
Q0.4
1
R
N
Q0.5
2
TON IN
PT
T37
+20
On the first scan,
enable State 1.
Beginning of State 1
control region
Turn on the red light on
First Street.
Turn off the yellow and
green lights on First
Street.
Start a 2-second timer.
SCR
Network 4
S0.2
SCRT
T37
Transition to State 2
after a 2-second delay.
Figure 9-58 Example of Sequence Control Relays (SCRs) for SIMATIC LAD, STL, and
FBD (continued)