Siemens SIMATIC S7-300 Quick Start Manual page 61

S5T#1S
FBD Elements for
Enter the FBD elements below for the TLIGHT sample program in your
OB1
OB1. Proceed as described in the table on the previous page.
Primer: S7-300 Programmable Controller, Quick Start
C79000-G7076-C500-01
Network 8: Timer start for yellow phase delay for vehicles
&
T4
M0.0
S_ODT
S
T3
TV
S5T#6S
R
??.?
Network 9: Red phase for pedestrians
>=1
T2
T3
Network 10: Timer start for red/yellow phase for vehicles
&
T5
M0.0
S_ODT
S
T4
S5T#3S TV
R
??.?
Network 11: Timer start for green request delay
T6
S_ODT
S BI
???
Q0.7
TV BCD
???
R Q
??.?
Network 1: FC1 call for traffic light control
FC1
??.?
EN ENO
Programming Logic Blocks with STEP 7
BI
???
BCD
???
Q
&
M0.0
>=1
M0.0
BI
???
BCD
???
Q
Q0.0
=
6-17