UNO-2050E User Manual
10
Isolated Inputs
Each of isolated digital input channels accepts 10 ~ 50 V
DC
voltage
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-2050E’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
Figure 2.4: Isolated Digital Input Connection
Table 2.2: Digital Input Signal Description
Signal Name
Reference
Direction
Description
DI <0...7>
COM
Input
Isolated digital input
signals
COM
-
Input
External common
input of DI
PC 5V
IDI channels
Internal
External
Protection
Circuit
Bi-direction
diode
S Vin
(COM)
