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C o n n e c t i n g t o 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 E-Series to a PNP-compatible PLC device, you must
first connect an external resistor pull-up between them. The external resistor
pull-up 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 E-Series
is a sinking device. Therefore, connect an output signal of your Matrox Iris E-Series
and the sourcing input to an external resistor pull-up. In addition, connect the
ground of the PNP-compatible PLC device and the ground of your Matrox Iris
E-Series to a common ground.
The external resistor pull-up 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 E-Series output is
"off", and vice-versa.
Matrox Iris
input and
output
connector
13
24
20
7
14
1
GND
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 o u t p u t s i g n a l s
Power
+24V
source
External
resistor
pull-up
output signal
GND
PNP-
compatible
PLC device
1 0 7
+V
Sourcing input
GND
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