Operation Theory
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4 Operation Theory
4.1 Isolated Digital Input Channels
The isolated digital input has an open collector transistor structure.
The input voltage range is 0 V to 24 V (0 V to 50 V for PCI-67433)
and the input resistance is 2.4 KΩ (4.7 KΩ for PCI-67433). The connec
-
tion between external signals and the 67432/33 is shown in Figure 4-1.
Please note that the input common junction could be common ground
or common power, they are dependent on the user’s environment.
Therefore, the digital input could be either a current source or a current
sink.
Figure 4-1: Isolated Input Connection
2.4K Ohm
Isolated Input
Signal (source)
COM m
(GND)
Current Flow
2.4K Ohm
Isolated Input
Signal (sink)
COM m
(+VDD)
Current Flow
Summary of Contents for 6743X Series
Page 42: ...36 Getting Service...
