IDEC SmartRelay functions
IDEC SmartRelay Manual 123
Parameters T
H
and T
L
Note the preset values for the parameters T
H
and T
L
in
Chapter 4.4.1.
Timing diagram
Functional description
The time T
H
is triggered with a 0 to 1 transition at input Trg.
If the status at input Trg is 1 at least for the duration of the
time T
H
, the output is set to 1 on expiration of the time T
H
(the
output follows the input with on-delay).
The time is reset when the signal at input Trg is reset to 0 be-
fore the time T
H
has expired.
A 1 to 0 transition at input Trg triggers the time T
L
.
If the status at input Trg is 0 at least for the duration of the
signal T
L
, the output is set to 0 on expiration of the time T
L
(the output follows the input with off-delay).
The time is reset when the signal at input Trg changes to 1
again before the time T
L
has expired.
If retentivity is not set, output Q and the expired time are re-
set after a power failure.
Trg
T
H
T
H
Q
T
L
T
L
T
H
T
L
T
a
expires
The bold section
of the timing dia-
gram is also
shown in the on/
off-delay symbol.
T
a
expires
Courtesy of Steven Engineering, Inc. ● 230 Ryan Way, South San Francisco, CA 94080-6370 ● General Inquiries: (800) 670-4183 ● www.stevenengineering.com
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