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When the auxiliary output signal is on, the circuit is grounded and the current
flows from the connected device to your Matrox Iris GT; when the signal is off,
the circuit is open.
S t a t e o f t h e o u t p u t s i g n a l
O n
O f f
The exact connection between your Matrox Iris GT, the connected external
device, and its power source depends entirely on the type of external device to
which you connect.
• NPN-compatible PLC devices. These devices include all forms of external devices
that are programmable logic controllers with NPN transistor types. A
NPN-compatible PLC device has an input that is enabled when it is grounded
(sinking input). A NPN-compatible PLC device does not provide power to the
connected device.
• PNP-compatible PLC devices. These devices include all forms of external devices
that are programmable logic controllers with PNP transistor types. A
PNP-compatible PLC device has an input that is enabled when it receives a voltage
(sourcing input).
• Inductive load devices. These devices include all forms of external devices that
have inductor wiring, such as a relay or small motor. Devices connected to an
inductive load device require a diode to protect them from over-voltage.
Over-voltage typically occurs when the inductive load device starts or when the
connected device disconnects. An inductive load device does not provide power
to the connected device.
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
S t a t e o f t h e s i n k d r i v e r
C l o s e d
O p e n
C i r c u i t g o e s t o
G r o u n d
N o t g r o u n d ( f l o a t i n g )
7 5
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