Advantech PCI-1711 Uživatelský manuál stáhnout pdf (Strana 32)

PCI-1711U Series User Manual 26

3.3.3 Digital Signal Connections

The PCI-1711U/UL has 16 digital input and 16 digital output channels.

The digital I/O levels are TTL compatible. The following figure shows

connections to exchange digital signals with other TTL devices:

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.

D.GND

TTL Devices

+5V

4.7K

D.GND

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Advantech PCI-1711 Uživatelský manuál Strana 32