Alpha Technologies FXM 650, 1100, 2000 UPS - Manual (Page 90)

017-230-B4 Rev B 88
Appendix B - Types of Triggers
There are 3 types of trigger:
B.1 Edge trigger
When the user input changes from one state to the other, the Alpha FXM is triggered to perform Action #1. If the
level is set to High, the action will be triggered by a Low to High edge (leading edge). If the level is set to Low, the
action will be triggered by the High to Low edge (falling edge).
Figure 59 — Edge Trigger
B.2 Level Toggle
When the Level is set to High, the Alpha FXM is triggered to perform the other action when the user input chang-
es from Low to High. If the input then changes from High to Low, Action #2 will be triggered. In other words, a
level change in the user input will trigger an action toggle between Action #1 and #2.
Figure 60 — Level Trigger
Low to High
edge trigger User input
Action #1 Action #1
(a) Level = High
User Input = Low to High, Action #1 is triggered
User Input = High to Low, no action triggered
High to Low
edge trigger
User input
Action #1 Action #1
(b) Level = Low
User Input = High to Low, Action #1 is triggered
User Input = Low to High, no action triggered
Action #1 Action #1
Action #2 Action #2 User input
(a) Level = High
User Input = Low to High, Action #1 is triggered
User Input = High to Low, Action #2 is triggered
Action #2 Action #2
Action #1 Action #1
User input
(b) Level = Low
User Input = High to Low, Action #1 is triggered
User Input = Low to High, Action #2 is triggered