User Manual

231 Chapter 7
Figure 7.33: GCL Logic for Rising Edge
7. Falling Edge
For Falling Edge application, the DO value will be activated to logic
high, when DI value is changing from logic high to logic low (it is so-
called falling edge). But the DO value won’t continuously remain logic
high. Instead, after a specific period (in the example project, it is 1 sec-
ond), the DO value will back to logic low. Refer to Figure 7.34 below for
its time chart:
Figure 7.34: Time Chart for Falling Edge
AND
AND
Start Timer 0
If Timer 0 ≧ 1 s Set Flag 0 = True
AND
If DI 0 = True
If DI 0 = True
If Flag 0 = False
Set DO 0 = True
Rule 1
Rule 2
Rule 3
DO 0
Time
T0 T1T0 + 1 second T1 + 1 second
DI 0
Falling Edge