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PCI-1730/1733/1734 User Manual 28

Isolated Digital Output

Each of the 32 isolated digital output channels comes equipped with a darlington

transistor. Every eight ouput channels share common emitters and integral suppres-

sion diodes for inductive load, activated by connecting PCOM to VDD. (Channels 0 ~

7 use PCOM0. Channels 8 ~ 15 use PCOM1. Channels 16 ~ 23 use PCOM2. If the

external voltage source (5~40 V) is connected to each isolated output channel (IDO)

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 EGND should not exceed 4.8

A. If the current for all channels combined exceeds 2 A, CN2 must be connected to

the external ground to share the extra current. The following figure shows how to

connect an external output load to the card's isolated outputs.

Figure 3.9 Isolated Digital Output Connection

Internal External

IDO0

IDO1

IDO2

IDO3

IDO4

IDO5

IDO6

IDO7

EGND

Isolated

Circuit

PCOM

Relay

Common

Diode

VDD

5~40V

1 2 ... 31 32 33 34 35 36 37 38 39 40 41 ... 53 54

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Advantech PCI-1730 User Manual Page 36