IDEC SmartRelay Manual
137
IDEC SmartRelay functions
4.4 Special functions list - SF
• 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
IDEC SmartRelay sets Output Q to hi immediately when the input Trg changes to hi.
IDEC SmartRelay retriggers the actual time T
a
at the 1 to 0 transition of Trg. The output
remains set. IDEC SmartRelay resets Output Q to 0 with off-delay when T
a
reaches the value
configured at T (T
a
=T).
IDEC SmartRelay retriggers he time T
a
with a one-shot at input Trg.
You can set input R (Reset) to reset the time T
a
and the output before T
a
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.
5
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