15
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15 - Graphical programming
Next, we need an operator that
switches to on when the upper
output is on, and o when the lower
output is on. We will use an RS toggle
switch. Click on the square in the fth
column of the second row, and add
the RS operator. The output from this
toggle switch can now directly con-
trol the digital output for the pump,
but we still need to add the pump
exercise calendar. Select the square to
the right of the RS toggle switch and
add the OR operator, and nally add
the output directly to the right of the
OR operator.
Connect the output from the > opera-
tor to the S input of the RS toggle
switch, and the output from the <
operator to the R input. Connect the
RS output to one of the inputs of the
OR operator, and the pump exercise
calendar to the other input.
Finally, connect the output from the OR operator to the digital output. You can now save the pro-
gram. This is the result.
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