Siemens LOGO! - Stairway Lighting Switch

155
LOGO! Manual
A5E00380835-01
4.4.9 Stairway lighting switch
Short description
An input edge triggers a configurable and retriggerable
time. The output is reset after this time has expired. A
warning signal can be output before this time has expired
to warn of the impending shutdown.
Symbol in
LOGO!
Wiring Description
Input Trg A signal at input Trg (Trig-
ger) triggers the off-delay
time for the stairway lighting
switch.
Parameter T represents the off-delay
time of the output (output
signal transition 1 to 0).
T
!
determines the triggering
time for the pre-warning.
T
!L
determines the length of
the pre-warning signal.
Retentivity:
/ = No retentivity
R = The status is retentive.
Output Q Q is reset after the time T
has expired. A warning sig-
nal can be output before
this time has expired.
Timing diagram
T
a
is busy
T
Q
Trg
T
!L
T
!
LOGO! functions