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The protected digital inputs, shown in Figure 27, are factory configured with 10 k ? pull-
up resistors. Digital I/O cards are also available in quantity with the protected digital
inputs pulled down as shown in Figure 27.
INPUT PULLED UP
Vcc
10 k W
Default
FD Factory
DIGIN
22 k W
74HC257
MULTIPLEXER
CPU card
10 nF
INPUT PULLED DOWN
DIGIN
22 k W
10 k W
74HC257
MULTIPLEXER
10 nF
CPU card
Figure 27. Protected Digital Inputs
A 0 ? surface-mount resistor is used as a jumper to select whether the inputs are pulled up
or down, as shown in Figure 28.
SINKING OUTPUTS
SOURCING OUTPUTS
1
2
3
1
2
3
INPUTS
PULLED UP
FD
Factory
Default
1
2
3
1
2
3
INPUTS
PULLED
DOWN
1
2
3
1
2
3
INPUTS
PULLED UP
FD
Factory
Default
1
2
3
1
2
3
INPUTS
PULLED
DOWN
Q20
C
Q28
C
1
2
U1
C17
U2
34
33
C18
J2
R27 Q27 C27 R35
Q35 C35
C
B E
B E
C
J1
U3
U5
C19
C21
U4
U6
C20
C22
Figure 28. Selecting Pulled Up or Pulled Down Digital Inputs
The digital inputs are able to operate continuously from -30 V to +30 V, and have a logic
threshold of 2.5 V. They are protected against spikes up to ±48 V.
76
Smart Star Digital I/O Cards (SR9200)
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