Switch 2: Selecting Rising Or Falling Edge Triggering - DirectLOGIC DL405 Manual

Switch 2: Positions 1,2,3 and 4 on Switch 2 determine whether the interrupt is triggered on the
Selecting Rising or rising (leading) edge of the input signal or on the falling (trailing) edge of the input
Falling Edge signal. This is often called "triggering." The examples earlier in this manual showed
Triggering the timing diagrams with a Rising edge trigger. They could just as easily have been
shown using the falling edge trigger. The following diagram shows the difference.
Set the dipswitches to the ON position for rising edge triggering, or set the
dipswitches to OFF for falling edge triggering. You will also notice that the points are
"paired." That is, one switch sets the triggering for two points. For example, If you
slide the position 2 switch to the ON position, then both inputs 2 and 3 will generate
interrupts on the rising edge.
Rising edge
Module starts the latching
process when the input comes ON
11
Falling edge
Module starts the latching
process when the input goes OFF
Input ON
Input OFF
11 11