Connecting To A Pnp-Compatible Plc Device - Matrox GatorEye Series Installation And Technical Reference

Connecting to a PNP-compatible PLC device

To connect your Matrox GatorEye to a PNP-compatible PLC device, you must
first connect an external pull-up resistor between them. The external pull-up
resistor is needed because PNP-compatible PLC devices expect to be connected
to a sourcing signal and your Matrox GatorEye's auxiliary output lines are all
sinking lines. Therefore, connect an output line of your Matrox GatorEye and the
sourcing input to an external pull-up resistor. In addition, connect the ground of
the PNP-compatible PLC device and the ground of your Matrox GatorEye to a
common ground.
The external pull-up resistor assures that when the signal on the output line is
disabled (off ), the external resistor will pull-up the PLC input to a positive voltage
(+V). This creates an inversion, with the PLC input "on" when the signal on your
Matrox GatorEye output line is "off", and vice-versa.
Matrox GatorEye
digital I/O and
power connector
Line5
1
Note that the output can
sink up to 100 mA.
Note that resistors rated for ¼ W are recommended, since they can handle the
❖
expected power.
Connecting external devices to auxiliary output lines
Power +24V
source max.
3 KΩ
GND
+V
External
pull-up
resistor
PNP input
(active high)
GND
PNP-
compatible
PLC device
83