5.4 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 options, which allow you to adapt the circuit program to suit your own
requirements.
This section provides you with a brief overview of input designations and with some particular
background information on SFs. The SFs in particular are described in Chapter7.5
5.4.1 Designation of the inputs
Logical inputs
Here, you will find the description of the connectors you can use to create a logical link to other blocks
or to the inputs of the xLogic unit.
S (Set):
A signal at input S sets the output to logical “1”.
R (Reset):
The reset input R takes priority over all other inputs and resets the outputs.
Trg (Trigger):
This input is used to trigger the start of a function.
Cnt (Count):
This input is used for counting pulses.
Fre (Frequency):
Frequency signals to be evaluated are applied to this input.
Dir (Direction):
This input determines the direction of count.
En (Enable):
This input enables a block function. When this input is “0”, other signals to the block will be ignored.
Inv (Invert):
A signal at this input inverts the output signal of the block.
Ral (Reset all):
All internal values are reset.
Parameter inputs
At some of the inputs you do not apply any signals. You configure the relevant block values instead.
Examples:
Par (Parameter):
This input will not be connected. Here, you set the relevant block parameters (times, on/off thresholds
etc.).
No (Cam):
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