Siemens LOGO! 24 User Manual

LOGO! Manual
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4.4.19 Stairwell Light Switch
Brief description
Following an input pulse (edge-controlled), a parameteriz-
able timed period starts. The output is reset when the de-
fined period has elapsed. 15 s before the time has elapsed,
an off warning is issued.
Symbol in
LOGO!
Connection Description
Input Trg Use the Trg (trigger) input to
start the time for the stair-
well light switch (off delay).
Parameter T T is the time after which the
output is switched off (out-
put state changes from 1
to 0).
Minutes are set as the de-
fault time base.
Output Q Q is switched off when the
time T has elapsed. 15 s be-
fore the time has elapsed,
the output switches to 0 for
1 s.
Parameter T
Please refer to the note in Section 4.3.2 when specifying
the values.
Timing diagram
15s
T
a
starts
T
1s
Q
Trg
Warning time
Warning duration
LOGO! Functions

Siemens LOGO! 24 Specifications

General

Dimensions	90 x 72 x 55 mm
Relay Outputs	4
Programming	LOGO! Soft Comfort
Mounting Type	DIN Rail
Protection Class	IP20
Inputs	8 Digital
Outputs	4 Relay
Output Current	10 A per relay output
Operating Temperature	0 ... 55 °C
Display	LCD with backlight