IDEC SmartRelay Manual
141
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 ranges and parameter defaults, refer to Section "On-delay (Page 132)".
Timing diagram
Functional description
The 0 to 1 signal transition at input Trg triggers the current time T
a
. IDEC SmartRelay sets
output Q when T
a
= T. A further signal at input Trg does not influence the time T
a
.
IDEC SmartRelay resets the output and the time T
a
with the next 1 signal at input R.
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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