Digital Inputs; Figure 2-14: Digital Inputs Schematic; Table 2-16: Digital Input Specifications; Table 2-17: Digital Input Pins On The Digital I/O Connector - Aerotech Automation1 SI4 Series Hardware Manual

SI4 Hardware Manual

2.3.1. 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 2-16: Digital Input Specifications
Input Voltage
+5 V to +24 V
Table 2-17: Digital Input Pins on the Digital I/O Connector
Pin # Description
19 Input Common for Digital Inputs 0-3
6 Opto-Isolated Digital Input 0
20 Opto-Isolated Digital Input 1
7 Opto-Isolated Digital Input 2
21 Opto-Isolated Digital Input 3
8 Input Common for Digital Inputs 4-7
22 Opto-Isolated Digital Input 4
9 Opto-Isolated Digital Input 5
23 Opto-Isolated Digital Input 6
10 Opto-Isolated Digital Input 7
www.aerotech.com
Figure
Approximate Input Current
6 mA
Figure 2-14: Digital Inputs Schematic
Figure 1-2.
1-3.
Turn On Time
10 µs
2.3.1. Digital Inputs
Turn Off Time
43 µs
In/Out/Bi
N/A
Input
Input
Input
Input
N/A
Input
Input
Input
Input
43