Siemens LOGO! 230 RC User Manual

25
LOGO! manual
EWA 4NEB 712 6006-02
3.5.3 Off-delay
The off-delay is represented in a cir-
cuit diagram by a relay with off-
delay:
In LOGO! the symbol for the off-
delay is as follows:
Trg
R
T
Q
Trg input You start the time for the off-delay by means of the Trg input (Trg
stands for trigger)
R input You reset the time for the off-delay and set the output to 0
via the R (reset) input (R has priority over Trg)
T parameter T is the time after which the output is switched off (the output sig-
nal changes from 1 to 0).
Timing diagram
Trg
T
TT
a
starts
Q
R
The bold part of the
timing diagram appears
in the off-delay symbol.
When the Trg input takes on the state 1, the output (Q) switches to 1 im-
mediately. If the state of Trg changes from 1 to 0, LOGO!’s current time
T
a
is started and the output remains set. If T
a
reaches the values set via T
(T
a
=T), the output (Q) is reset to 0 (off-delay).
If the Trg input is switched on and off again, the time T
a
starts again.
You reset the time T
a
and the output via the R (reset) input before the time
T
a
has elapsed.
Applications
Automatic stairway lighting system
Programming LOGO!

Siemens LOGO! 230 RC Specifications

General

Inputs	8 digital inputs
Outputs	4 relay outputs
Input voltage type	AC
Width	72 mm
Height	90 mm
Depth	55 mm
Number of analog inputs	0
Number of analog outputs	0
Operating temperature	0 °C to 55 °C
Storage temperature	-40 °C to 70 °C
Protection class	IP20
Digital inputs according to EN 61131-2	Type 1
Weight	approx. 210 g
Program Memory	400 function blocks
Dimensions	72 mm x 90 mm x 55 mm