JYTEK PCIe-67432, Руководство пользователя

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Introduction 7
Figure 1-3: Isolated Input Connection
Isolated Digital Output Channels
Common ground connection of the isolated digital output is as shown.
When isolated digital output is ON, sink current is through transistors,
and when OFF, none is. When the load is of an inductance nature, such
as a relay, coil or motor, the VDD pin must be connected to an external
power source. The extra connection is utilized for the flywheel diode to
form a current-release closed loop, whereby transistors are protected
from any high reverse voltage generated by the inductance load when
output is switched from ON to OFF.
2.4k
Ÿ
Isolated Input
Signal (source)
COM m
(GND)
Current Dir.
2.4k Ÿ
Isolated Input
Signal (sink)
COM m
(+VDD)
Current Dir.