IDEC SmartRelay functions
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IDEC SmartRelay Manual 
4.3 Basics on special functions
Because of their different input designation, you can see 
right away that there is a difference between the special 
functions and basic functions. SFs contain timer functions, 
retentive functions and various parameter assignment op
-
tions, which allow you to adapt the circuit program to suit 
your own requirements.
This section provides you with a brief overview of input des-
ignations and with some particular background information 
on SFs. The SFs in particular are described in Chapter 
4.4.
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