36
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 suppression diodes for inductive load, actived by
connecting PCOM to VDD. (Channels 0~7 use PCOM0. Channels
8~15 use PCOM1. Channels 16~23 use PCOM2. Channels
24~31 use PCOM3.)
If the external voltage (5~40 V) is connected to each isolated output
channel (IDO) and its isolated digital output turns on (200 mA per
channel maximum), the card's current will sink from the external
voltage. The current through each EGND should not exceed 50 mA.
If the current for all channels combined exceeds 150 mA, return the
current to the external voltage through CN1. The following figure
shows 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
NO
NC
Common
Diode
VDD
5~40V
Figure 3-13: Isolated digital output connection