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LOGO! Manual
A5E00380835-01
4.3.1 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 in-
puts of the LOGO! 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,
for example.
En (Enable):
This input enables a block function. When this input is
“0”, other signal from 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.
Connector X at SF inputs
SF inputs connected to connector x are set low. That is, the
inputs carry a ’lo’ signal.
LOGO! functions
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