LMI Technologies Gocator 2130, Руководство пользователя, Страница: 109 / 652

Gocator Line Profile Sensors: User Manual
Gocator Web Interface • 109
Trigger Examples
Example: E Conveyor
Encoder triggering is used to perform profile
measurements at a uniform spacing.
The speed of the conveyor can vary while the
object is being measured; an encoder ensures
that the measurement spacing is consistent,
independent of conveyor speed.
Example: Time + Conveyor
Time triggering can be used instead of encoder
triggering to perform profile measurements at
a fixed frequency.
Measurement spacing will be non-uniform if
the speed of the conveyor varies while the
object is being measured.
It is strongly recommended to use an encoder
with transport-based systems due to the
difficulty in maintaining constant transport
velocity.
Example: External Input + Conveyor
External input triggering can be used to
produce a snapshot for profile measurement.
For example, a photocell can be connected as
an external input to generate a trigger pulse
when a target object has moved into position.
An external input can also be used to gate the
trigger signals when time or encoder triggering
is used. For example, a photocell could
generate a series of trigger pulses as long as
there is a target in position.