Web Detected Indicator
A small square indicator on the bottom left part of the screen indicates the presence and absence of the web
as seen by the sensor in the respective mode of operation. When in edge mode the indicator turns green
whenever the sensor sees a web edge. When in contrast mode the indicator turns green when the desired
contrast is seen by the sensor.
This web detect indicator can be used for troubleshooting purposes. If this indicator turns off intermittently
while a web is in front of the sensor it may indicate that the sensor is finding it difficult to accurately sense
the web edge or the contrasting feature. This indicates a low contrast condition. Such a condition may occur
for optical grade clear webs with low scattering in the infrared spectrum or when the desired contrast
feature is not seen by the sensor.
Web Position Indicator
A horizontal bar graph, white bar in a black
background, in the main operator interface is used
to indicate the relative position of the web within
the sensor range. The edge position or the contrast
position is displayed using the white horizontal
bar. The white portion indicates the web,
specifically representing the light
reflected/scattered back from a web, while the
black background indicates the absence of web,
specifically the darkness because of no reflection
or scattering from the web.
Depending on the position and orientation of the
sensor the white bar graph may move:
●
from left to right for a sensor located on
the right side of the web edge
●
from right to left for a sensor that is
located on the left side of the web edge.
When a wide sensor is connected and if the
sensor is set to see both the edges, then both left
and right edges of the web will be shown using the
web position indicator. The vertical green line in
the middle indicates the centerline position of the
web.
When two sensors are connected, the bar graph
will split in two, with the left half indicating the left
edge of the web and the right half indicating the
right edge of the web. If both sensors are the same
Content subject to change without notice
SCU5: Sensor and Web Guide Controller User Manual v 3.6| Page 16
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