Connecting To A Pnp-Compatible Plc Device - Matrox Iris GT with MIL Manual

Connecting to a PNP-compatible PLC device

To connect your Matrox Iris GT 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 Iris GT's auxiliary output signals are all sinking
signals. Therefore, connect an output signal of your Matrox Iris GT 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 Iris GT to a
common ground.
The external pull-up resistor assures that when the output signal 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 your Matrox Iris GT output
is "off", and vice-versa.
Matrox Iris GT digital I/O
and power connector
AUX(USER)_OPENC_OUT6
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 signals
Power
+24V
source
3 KΩ
1
GND
+V
External
pull-up
resistor
PNP input
(active high)
GND
PNP-
compatible
PLC device
87