Matrox Iris E Series Installation And Technical Reference page 105

When the output signal is on, the circuit is grounded and the current flows from
the connected device to your Matrox Iris E-Series; 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 E-Series , the connected external
device, and its power source depends entirely on the type of external device to
which you connect.
• NPN-compatible PLC devices. NPN-compatible PLC 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. PNP-compatible PLC 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 current (sourcing input).
• Inductive load devices. Inductive load 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.
• Strobes. Strobes include all forms of output devices that provide additional
lighting upon request, providing the best possible results when grabbing an image
in otherwise reduced or poor illumination.
• TTL devices. Transistor-transistor logic (TTL) devices include all forms of devices
that expect the device to which it is connected to provide the necessary current.
Note that a TTL device can be used as either an input or an output device. For
more information on using a TTL device as an input device, refer to the Connecting
external devices to input signals section, later in this chapter.
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