Lindy Carbon Monoxide Alarm - Manual (Page 38)

O
PERATION O
PERATION
4
Rack
4.9.5
[-] Previous Feedback Input
Selection pointer to previous input.
[+] N EXT F EEDBACK I NPUT
Selection pointer to next input.
[F] F ILTER
Origin of the feedback.
[D] D ELAY T IME
Set the delay time after the
operation of the input event f1 in s.
[H] H
OLD T IME
Set the hold time of f2 after the
release of f1 in s.
[P] P
ASS C ONDITION
Set the pass mode.
thru
pass
conditional pass if input condi-
tion is still met
[E] E FFECT
State how the input acts on
the OR element.
thru
switched through
off switched off
invert switched through
in inverted fashion
[?] H ELP
Explanation of the menu
items.
[Q] Q UIT
Jump back to the previous
menu.
FEEDBACK INPUTS
To realise complex filter conditi-
ons, each filter has two feedback
inputs where filter events can be
further processed.
The special feature here is the
possibility of delay (delay time),
conditional evaluation (pass
condition) and hold time.
F1: Filter 1
F2: Feedback input of filter 2.
f1: F1 output event, input event
of F2
f2: Output of the feedback input
of F2
With a pass condition = thru,
the effective hold time of f2 can
be extended by any time by sub-
sequent events of f1 (retriggering).
f2 in this case is not released
until thold after the last falling
edge of f1.