IDEC SmartRelay Manual
145
IDEC SmartRelay functions
4.4 Special functions list - SF
• 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 ranges and parameter defaults, refer to the On-delay (Page 132)topic.
Timing diagram A
Timing diagram B
Functional description
A 0 to 1 transition at input Trg triggers the time T
L
(Time Low). After the time T
L
has expired,
output Q is set for the duration of T
H
(Time High).
If there is a further 0 to 1 transition (retriggering pulse) at input Trg before the preset time (T
L
+ T
H
) has expired, T
a
is reset and the pulse/pause cycle is restarted.
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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