IDEC SmartRelay Manual
143
IDEC SmartRelay functions
4.4 Special functions list - SF
• 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 Section "On-delay (Page 132)".
Timing diagram
Functional description
A 0 to 1 transition at input Trg sets the output, and triggers a time T
a
during which the output
remains set.
IDEC SmartRelay resets output Q to lo (pulse output) when T
a
reaches the value preset at T
(T
a
= T).
IDEC SmartRelay sets the output immediately if there is a 1 to 0 transition at input Trg before
the specified time 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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