USB-4718 User Manual 30
Figure 3.3: Digital Input Channel Connections
3.5 Isolated Digital Output ConnectionsUSB-4718 has 8 isolated digital output channels designated IDO0~IDO7.
Each of isolated output channels comes equipped with a Darlington tran-
sistor. All 8 output channels share common collectors and integral sup-
pression diodes for inductive loads. Figure 3-4 shows how to connect an
external output load to the module’s isolated outputs.
Note:
If an external voltage (5 ~ 30 VDC) is applied to an isolated output
channel while it is being used as an output channel, the current will
flow from the external voltage source to the card. Please take care that
the current through each IDO pin not exceed 200 mA.