2-2
Functional Description
Input Circuitry
The PIO-32I/O has 16 digital input channels and uses the J1 ribbon
header (channels 0 to 15). The PIO-32IN has 32 digital input channels
and uses the J1 and J2 ribbon headers (channels 0 to 31). Figure 2-2
shows each input channel schematically. You must limit the input voltage
to 28VDC and the input current to 15mA maximum. The positive input
signals are labeled P
n
P (where
n
is the bit number, 0 to 31); the negative
input signals are labeled P
n
N (where
n
is the bit number, 0 to 31).
Figure 2-2. Typical Input Circuit
To HCT logic
(inverted logic)
47k
Ω
+5V
2.0k
Ω
, 1/2W
PnP
PnN
To ribbon header
input
1/4 of ILQ-2
28VDC and
15mA (maximum)
