IDEC SmartRelay Manual
151
IDEC SmartRelay functions
4.4 Special functions list - SF
• 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 the On-delay (Page 132)topic.
Timing diagram
Functional description
A 0 to 1 signal transition at input Trg sets output Q. The next 1 to 0 transition at Trg retriggers
the current time T
a
, and output Q remains set.
IDEC SmartRelay resets output Q when T
a
= T. You can output a warning signal before the
off-delay time (T - T
!
) expires to reset Q for the time of the pre-warning period T
!L
.
A further one-shot at input Trg during T
a
retriggers the time T
a
.
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.
Setting the Par parameter
Note the defaults specified in topic Time response (Page 124).
View in programming mode (example):
Note
All times must have the same timebase.
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