User manual

PCI-1750 User Manual 14
3.2.5 Isolated Outputs
Each of 16 isolated digital output channels comes equipped with a Darlington transis-
tor. Every eight output channels share common collectors and integral suppression
diodes for inductive loads. Channels 0 ~ 7 use COM1, and channels 8 ~ 15 use
COM2 as a common pin.
Figure 3.2 shows how to connect an external output load to the card's isolated out-
puts.
Figure 3.2 Connecting an external output load
Note! If the external voltage source (5~40 V) is connected to each isolated
output channel (IDO0 ~ IDO15) and its isolated digital output turns on
(200 mA max./ch), the card's current will sink from the external voltage
source. The current through IGND should not exceed 3.2 A. Use the
extended ground connector CN5 to shunt the current to the external
voltage source ground.