Using Multiple Pcl-832S In One System - Advantech PCL-832 Manual

Using multiple PCL 832s in one system
I n s t a l l a t i o n
When using multiple PCL-832 cards in one system, the cards have to
be setup as follows:
Select one card as the master card
Setup the interrupt levels for the DDA cycle time and the error counter
overflow on the master card (using JP4)
Leave the slave cards' DDA cycle time interrupt open
Set the slave cards' error counter overflow interrupt the same as the
master card's
Remove resistor R53 from all the slave cards
P r o g r a m m i n g
The instructions to enable the cards' DDA cycles must be called as
close in succession as possible. The time difference between the DDA
cycles of the cards should be as small as possible. The following
diagram shows the time differences between the DDA cycles of the
cards.
D D A c y c l e
D D A c y c l e
D D A c y c l e
T i m e
Slave 2 DDA cycle enabled
difference t
Slave 1 DDA cycle enabled
M a s t e r D D A c y c l e e n a b l e d
DDA cycle time differences
24 PCL 832 User's Manual