Advantech PCI-1756 - Isolated Digital Output; Channel-Freeze Function

23 PCI-1756 User Manual
Chapter 3 Signal Connections
3.3.3 Isolated Digital Output
Each of isolated output channels comes equipped with a MOSFET, polyswitch (for
current protection) and flywheel diode for using with inductive loads which can be
activated by connecting PCOM to V
DC
. If an external voltage (5 ~ 40 V
DC
) is applied
to an isolated output channel, the current will flow from the external voltage source to
the card. Please note that the current through each IDO channel should not exceed
200 mA.
Figure 3.4 Isolated Digital Output Connection
3.3.4 Channel-Freeze Function
The PCI-1756 provides a digital input channel (CH_FRZ_IN) to enable the channel-
freeze function. The channel-freeze function acts when the pin CH_FRZ_IN is acti-
vated. Moreover, you can setup the input mode of channel-freeze function input
channel CH_FRZ_IN as dry contact input mode or wet contact input mode selected
by on-board jumper JP2. The wiring in wet contact and dry contact input mode are
shown in Figures 3.5 and 3.6.
Figure 3.5 Wiring in wet contact input mode