Advantech UNO-3072A, User Manual

Page: 27 / 84

17 Chapter 2
2.5 Onboard Isolated Digital Input
The UNO-3072A/3074A has 4 isolated DI channels designated DI0~DI3.
2.5.1 Pin Assignments
The connector type of UNO-3072A/3074A is plug-in screw terminal
block that enables you to connect to field I/O devices directly without
additional accessories. Figure 2.4 and Table 2.4 shows its pin assignment
as well as signal description.
Figure 2.4: Digital Input Connector Pin Assignments
2.5.2 Isolated Inputs
Each of isolated digital input channels accepts 0 ~ 50 V
DC
voltage inputs,
and accepts bi-directional input. The voltage range is -3 ~ 3 V
DC
for logic
0 (low), -50 ~ -10 V
DC
and 10 ~ 50 V
DC
for logic 1 (high). It means that
you can apply positive or negative voltage to an isolated input pin (Vin).
All channels share two common pins (I.GND). Figure 2.8 shows how to
connect an external input source to an UNO-3072A/3074A isolated input
channel.
Please note that DI0 and DI2 may be configured as gate control pins of
Counter 0 and Counter 1; While DI1 and DI3 may be configured as input
pins of Counter 0 and Counter 1.