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2.4.3.2. Configurable Digital Input
The digital input is implemented in the form of a weak pull-up resistor. This means
that the reading of the floating input is always high.
Users must follow the electrical specifications set in the 2.4.1 ‘universal specification’.
This example shows how a simple button is connected to a digital input.
2.4.3.3. Communicate with other Machines or PLCs
If general GND (0V) is established and the machine uses open-drain output
technology, digital I/O and other can be used device communication, see the figure
below.
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