C.1
Overview
Maintaining good signal connections is one of the most important factors in ensuring
that your application system is sending and receiving data correctly. A good signal
connection can avoid unnecessary and costly damage to your PC and other hard-
ware devices.
C.2
Isolated Digital I/O Connections
C.2.1
Dry/Wet Contact Support for Digital Input
Each digital input channel accepts either dry contact or 0 ~ 5 VDC wet contact inputs.
Dry contact capability allows the channel to respond to changes in external circuitry
(e.g., the closing of a switch in the external circuitry) when no voltage is present in the
external circuit. Figure 3-1 shows external circuitry with both wet and dry contact
components, connected as an input source to one of the card's digital input channels.
C.2.2
Isolated Digital Output Connections
Each of 8 isolated digital output channels comes equipped with a Darlington transis-
tor. Every 8 output channels share common collectors and integral suppression
diodes for inductive loads. Channels 0 ~ 7 use COM0, and channels 8 ~ 15 use
COM1 as a common pin. If an external voltage (5 ~ 40 V) is applied to an isolated
output channel (IDO 0 ~ IDO 15) while it is being used as an output channel, the cur-
rent will flow from the external voltage source to the card. Please take care that the
current through each GND pin not exceed 100 mA.
AIIS-1440 User Manual
Figure C.1 Isolated Digital Input Connections
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