Automating Manufacturing Systems - Process Control and ...

plc advanced functions - 16.27
Program 2
Program 3
S2:1/15 - first scan
A
FOR
label number 0
index N7:0
initial value 1
terminal value 10
step size 2
JSR
Program File 3
Input par N7:0
Return par N7:0
NXT
label number 0
SBR
Input par N9:0
ADD
SourceA N9:0
SourceB 1
Dest N9:0
RET
Return par N9:0
Figure 16.28
C Program Implementation
16.6.2 Traffic Light
Problem: Design and write ladder logic for a simple traffic light controller that has
a single fixed sequence of 16 seconds for both green lights and 4 second for both yellow
lights. Use either stacks or sequencers.
Solution: The sequencer is the best solution to this problem.