User manual

Isolated Digital Output

Each of the 16 isolated digital output channels comes equipped with a

darlington transistor. Every eight ouput channels share common

emitters and integral suppression diodes for inductive load, activated

by connecting PCOM to VDD. (Channels 0 ~ 7 use PCOM0. Channels

8 ~ 15 use PCOM1.)

If the external voltage (5 ~ 40 V) is connected to each isolated output

channel (IDO) and its isolated digital output turns on (150 mA per

channel maximum), the card's current will sink from the external

voltage. The current through EGND should not exceed 2.4 A.

If the current for all channels combined exceeds 2 A, CN5 must be

connected to the external ground to share the extra current. The

following figureshows how to connect an external output load to the

card's isolated

outputs.

Internal External

IDO0

IDO1

IDO2

IDO3

IDO4

IDO5

IDO6

IDO7

EGND

Isolated

Circuit

PCOM

Relay

Common

Diode

VDD

5~40V

Figure 3-9: Isolated digital output connection