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4 Interfaces
Page 12 / 24
4.1.1
Digital I/O
The following illustration shows the electrical equivalent circuit for the digital input and output signals:
Figure 2: Simplified digital I/O circuit
The input signals use a Schmitt trigger circuit with the power supply GND as voltage reference.
The digital output circuit uses open-emitter configuration. All outputs are internally supplied by the 24V
power input.
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