Edge-Triggered Interval Time-Delay Relay - Siemens LOGO! 24RC Manual

LOGO! Functions
4.4.8

Edge-Triggered Interval Time-Delay Relay

Brief description
An input signal produces a signal of a parameterizable
duration at the output (retriggerable).
Symbol in
LOGO!
Parameter T
Please refer to the note on the T parameter in Sec-
tion 4.3.2.
Timing diagram
Trg
Q
T starts
a
Description of function
When the input Trg switches to the state 1, the output Q
immediately switches to the state 1. At the same time, the
time T
a
(T =T), the output Q is reset to 0 (pulse output).
a
If the input Trg changes again from 0 to 1 before the set
time has elapsed (retriggering), the time T
output remains on.
94
Connection
Input Trg
Parameter T
Output Q
T
T
starts running. If T
Description
The input Trg (Trg stands for
trigger) starts the time for
the edge-triggered interval
time-delay relay
T is the period after which
the output is switched off
(output signal is switched
from 1 to 0).
Q switches on when Trg
does but when Trg switches
off remains on until the
delay period T has elapsed.
The bold part of the timing diagram
appears in the edge-triggered interval
time-delay relay symbol.
reaches the time specified for T
a
a
is reset and the
LOGO! Manual
A5E00067781 01