Table 2.2:Digital Input Signal Description; Figure 2.4:Isolated Digital Input Connection - Advantech UNO-2050G User Manual

Table 2.2: Digital Input Signal Description
Signal Name
DI <0...7>
COM
Isolated Inputs
Each of isolated digital input channels accepts 10 ~ 50 V
inputs, and accepts bi-directional input. It means that you can apply posi-
tive or negative voltage to an isolated input pin (Vin). All eight channels
share one common pin (COM). Figure 2-4 shows how to connect an
external input source to one of the UNO-2050G's isolated input channels.
Please note that DI4 and DI5 may be configured as Counter 0 and
Counter 1's gate control pins; DI6 and DI7 may be configured as Counter
0 and Counter 1's clock input pins. Please refer to "Section 2.6" for detail
External
S Vin
(COM)
Figure 2.4: Isolated Digital Input Connection
UNO-2050G User Manual
Reference Direction
COM Input
- Input
Internal
Protection
Circuit
Bi-direction
diode
10
Description
Isolated digital input
signals
External common
input of DI
voltage
DC
PC 5V
IDI channels