Advantech PCL-734 Manual do Utilizador descarregar pdf (Página 33)

TTL-level Digital Input/Output

The PCI-1730 has 16 TTL-level digital inputs and 16 TTL-level digital

outputs. The following figure shows connections to exchange digital

signals with other TTL devices:

GND

PCI-1730 TTL device

Figure 3-6: TTL-level digital input/output connection

If you want to receive an OPEN/SHORT signal from a switch or relay,

add a pull-up resistor to ensure that the input is held at a high level

when the contacts are open. See the figure below:

GND

Switch

+5V

4.7K

PCI-1730

Figure 3-7: Open/short connection

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Advantech PCL-734 Manual do Utilizador Página 33