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C o n n e c t i n g t o a P N P - c o m p a t i b l e P L C d e v i c e
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 device
that can provide power (a sourcing device) and your Matrox Iris GT is a sinking
device. 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 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)_IND_OUT0
1
Note that the output can
sink up to 100 mA.
C o n n e c t i n g e x t e r n a l d e v i c e s t o a u x i l i a r y o u t p u t s i g n a l s
Power
source
External
pull-up
resistor
GND
+24V
max.
+V
1
In 0
GND
PNP-
compatible
PLC device
7 7
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