value 3 and just one input is set to ON, only the Out 3
output will be set to ON. As soon as two inputs change
to ON, the Out 3 output remains at ON and the Out 4
output changes to ON. As soon as a third input changes
to ON, the Out 3 and Out 4 outputs remain ON and Out
1 changes to ON.
As soon as the number of outputs decreases, the outputs
changing to OFF will be those which have been in the ON
state the longest. As soon as one output changes to OFF,
pilot output number takes the value of the output number
after the output(s) which has (have) just been set to OFF.
To complete the above example, as soon as one input
changes to OFF, the Out 3 output changes to OFF and
PILOT output number displays the integer value 4.
The Parameters tab in the property box contains the
number of outputs which may change ON depending on
the number of inputs which are set to ON. The values of
this parameter are fixed at 2, 3 or 4.
If the value of the parameter is fixed at 2, only the Out 1
and Out 2 outputs are used and may, therefore, change
to ON. In this case, if more than two inputs change to ON,
the Out 1 and Out 2 outputs remain at ON and the Out 3
and Out 4 outputs remain fixed at OFF.
If the value of the parameter is fixed at 3, only the Out 1,
Out 2 and Out 3 outputs are used and may, therefore,
change ON. In this case, if four inputs change to ON, the
Out 1, Out 2 and Out 3 outputs remain at ON and Out 4
remains fixed at OFF.
If the value of the parameter is fixed at 4, only the Out 1,
Out 2, Out 3 and Out 4 outputs are used and may,
therefore, change to ON.
All inputs which are not connected have the value OFF.
When the program is initialized, the pilot output number
is fixed at 1.
The Parameters tab contains the default checkbox which
re-initializes pilot output number to 1 (and defines the first
output activated when the first input changes to 1) after
a controller power failure.
Example of use:
Filling a tank with a group of four pumps operating in
parallel. The operating duration of each pump is the same.
The "number of outputs controlled" parameter is fixed at
4.
On initialization, pilot output number has the value 1. On
initialization, if the tank is in the state indicated and if a
sensor above the water is in the ON state when the user
program is executed, the INPUT 1 and INPUT 2 inputs are
ON, INPUT 3 and INPUT 4 are OFF and Out 2 and Out 3
are ON.
Assuming that the tank is full, Input 2 changes to OFF and
Out 1 changes to OFF. Pilot output number indicates the
value 2.
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