2-3
Output Circuitry
The PIO-32I/O has 16 digital output channels and uses the J2 ribbon
header (channels 16 to 31). The PIO-32OUT has 32 digital output
channels and uses the J1 and J2 ribbon headers (channels 0 to 31).
Figure 2-3 shows the output channels schematically. The output channels
are reed relays (form A) rated to 10W at 0.75A or 30V RMS, 42.4V peak,
or 60VDC maximum (resistive). The relay connections are not polarized
(positive or negative equivalent) and are labeled P
n
P and P
n
N (where
n
is
the bit number, 0 to 15).
Figure 2-3. Typical Output Circuit
+5V
PnP
To ribbon header
output
PnN
1/8
74LS244
read
back
1/8
74LS273
data
register
2
1
relay
1/2
relay driver
