2.3.2. Digital Inputs
Input bits are arranged in groups of 4 and each group shares a common pin. This lets a group be
connected to current sourcing or current sinking devices, based on the connection of the common
pin in that group.
To be able to connect an input group to current sourcing devices, connect the input group's
common pin to the power supply return (-). Refer to
.
To be able to connect an input group to current sinking devices, connect the input group's
common pin to the power supply source (+). Refer to
The digital inputs are not designed for high-voltage isolation applications. They should only be used
with ground-referenced circuits.
Table 2-26:
Digital Input Specifications
Input Voltage
Approximate Input Current
Turn On Time
Turn Off Time
+5 V to +24 V
6 mA
10 µs
43 µs
Table 2-27:
Digital Input Pins on the Digital I/O Connector
Pin #
Description
In/Out/Bi
19
Input Common for Digital Inputs 0-3
Output
6
Opto-Isolated Digital Input 0
Input
20
Opto-Isolated Digital Input 1
Input
7
Opto-Isolated Digital Input 2
Input
21
Opto-Isolated Digital Input 3
Input
8
Input Common for Digital Inputs 4-7
Output
22
Opto-Isolated Digital Input 4
Input
9
Opto-Isolated Digital Input 5
Input
23
Opto-Isolated Digital Input 6
Input
10
Opto-Isolated Digital Input 7
Input
Figure 2-24:
Digital Inputs Schematic
2.3.2. Digital Inputs
iXI4/XI4 Hardware Manual
54
www.aerotech.com
