IDEC SmartRelay Manual
139
IDEC SmartRelay functions
4.4 Special functions list - SF
• Interval time-delay relay/Pulse output (Page 142)(current time Ta)
• Edge-triggered interval time-delay relay (Page 144)(current time Ta)
• Asynchronous pulse generator (Page 146)(current time Ta)
• Stairwell light switch (Page 150)(current time Ta)
• Dual-function switch (Page 152)(current time Ta)
• Stopwatch (Page 166)(actual value AQ)
• Frequency trigger (Page 175) (actual value Fre)
Select the required function by the block number. The timebase is configurable. For information
on valid timebase ranges and parameter preset, refer to Section "On-delay (Page 132)".
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
, IDEC SmartRelay sets the
output to 1 on expiration of the time T
H
(the output follows the input with on-delay).
IDEC SmartRelay resets the time when IDEC SmartRelay resets the signal at input Trg to 0
before the time T
H
expires.
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
, IDEC SmartRelay sets
the output to 0 on expiration of the time T
L
(the output follows the input with off-delay).
IDEC SmartRelay resets the time when the signal at input Trg changes to 1 again before the
time T
L
expires.
If the block is retentive, IDEC SmartRelay resets output Q and the expired time to the values
before a power failure; if the block is not retentive, IDEC SmartRelay resets output Q and the
expired time to defaults after a power failure.
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