Advantech PCL-734, User Manual

Page: 17 / 22

Chapter 3 Signal connections 13
Isolated Output
Each of the eight isolated digital output channels come equipped with
eight darlington transistors featuring common emitters and integral
suppression diodes for inductive loads.
If the external voltage (5 to 40 V) is connected to each isolated output
channel (IDO) and its isolated digital output turns on (max. of 200
mA per channel), the card's current will sink from the external
voltage. The current through each E.GND should not exceed 50 mA.
If the current for all channels combined exceed 150 mA, return the
current to the external voltage through CN2. The following figure
shows how to connect an external output load to the card's isolated
outputs.
EXTERNAL CIRCUITRY INTERNAL CIRCUITRY VCC
ONE PAIR OF 2803A
NPN
DIODE
VDD
DC(5-40V)
E.GND
PC817C
E.GND
DC/DC
R
R
NPN
L O A D
R R
R
IDO
PCOM