ADLINK MXC-4000 Series - Manual (Page 25)

System Description 15
Matrix MXC-4000 Series
User’s Manual
2.3 Operating Principles
2.3.1 Isolated Digital Input
Isolated digital input utilizes an open collector transistor structure,
with input voltage range of 0 V to 24 V and input resistance of 2.4K
Ω. Connection between external signals and the MXC-4002D/
4011D controller is as shown.
Note: The common input junction can be common ground or
common power, based on the applied environment, such
that digital input can be either a current source or current
sink.
Figure 2-1: Isolated Input Connection