C
ONNECT
STC
S
TO
D
ISCRETE
I/O
5-12
B
i-
D
ir
ec
ti
o
n
a
l
U
se
r
I/
O
In
p
u
t
W
ir
in
g
Bi-Directional User I/O
Figure 5-15
Example of User I/O as Input
Figure 5-16
Example of User I/O as Output
Note:
To maintain electrical isolation between the PCI and external I/O, the power and ground
connections should be from an external power source, and should not be tied to the PCI’s
power or ground connections.
UserIO_A0
UserIO_A0_Rtn
User I/O As Input
PCI
C
E
Normally
closed
+5V to +24V
R
Pull-Up
Input
For +5V circuits, use R= 820 ohms
For +24V circuits, use R= 6.8K
+5V to +24V
Pull-Down
Input
R
Or
Note:
An external series re-
sistor must be used.
26
1
UserIO_A0
UserIO_A0_Rtn
+5V to +24V
1
26
PCI
R
Pull-Up
Output
C
E
+5V to +24V
R
Pull-Down
Output
User I/O As Output
Or
For +5V circuits, use R= 820 ohms
For +24V circuits, use R= 6.8K
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