IDEC SmartRelay functions
IDEC SmartRelay Manual
137
Parameters T
H
and T
L
Note the preset values for the parameters T
H
and T
L
in
Chapter 4.3.2.
The on-delay and off-delay times for parameters T
H
and T
L
can be based on the actual value of another, already-
configured function. You can use the actual values of the
following functions:
•
Analog comparator (actual value Ax - Ay, see Chapter
4.4.18)
•
Analog trigger (actual value Ax, see Chapter 4.4.16)
•
Analog amplifier (actual value Ax, see Chapter 4.4.20)
•
Analog multiplexer (actual value AQ, see Chapter 4.4.26)
•
Analog ramp control (actual value AQ, see Chapter
4.4.27)
•
Analog math (actual value AQ, see Chapter 4.4.30)
•
PI controller (actual value AQ, see Chapter 4.4.28)
•
Up/down counter (actual value Cnt, see Chapter 4.4.13)
Select the required function by the block number. The
timebase is configurable. For information on valid timebase
ranges and parameter preset, refer to Chapter 4.4.1.
Trg
T
H
T
H
T
a
expires
Q
T
L
T
a
expires
T
L
T
H
T
L
The bold section of
the timing diagram
is also shown in the
on/off-delay
symbol.
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
before 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
reset after a power failure.
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