Siemens Simatic S7-200 CPU 210 System Manual page 50

Getting Started with a Sample Program
Network 5
I0.2
/
Network 6
I0.2
/
Network 7
I0.2
/
Network 8
M0.0
Network 9
M0.1
Network 10
M0.2
Network 11
END
Figure 3-11 Home Security Program Example in Ladder, continued
3-10
Reset everything if the system is disarmed.
I0.3
M0.0
P /
R
1
M0.1
R
1
M0.2
R
1
Q0.3
R
1
Use the negative transition to turn the LED on.
I0.0 SM0.5
/
I0.1
/
Use the positive transition to turn the LED off.
I0.0 SM0.5
/
I0.1
/
Turn on the system LED.
Q0.0
Turn on the alarm siren.
Q0.1
Turn on the low-level alert notification.
Q0.2
End of the Program.
M0.0
N R
1
M0.0
P
S
1
S7-200 Programmable Controller, CPU 210
C79000-G7076-C235-01