viewing area. Similarly the controller will not pick the leftmost or rightmost region when in line mode since
for a line both edges need to be visible in the sensor viewing area.
WARNING:
While teaching, the controller would allow the user to pick a non-unique region of interest.
However, after teaching the controller will always track the first occurrence of the non-unique region while
scanning from left to right.
NOTE:
No region will be highlighted if the feature of interest is not in the field of view of the sensor. This
condition is called the “No Contrast” condition.
NOTE:
While in automatic mode for web guiding, the web guide will automatically go to an interlock mode
and will prevent the web guide to actuate whenever a no contrast condition is seen. As soon as the feature
of interest reappears the web guide will actuate if the position of the feature is not at the desired guide
point.
NOTE:
When no contrast condition occurs, the analog output will provide the middle value of its output
range. The digital output through ethernet would have a number equal to the total number of pixels in the
sensor. Under normal operation, the digital contrast position output would range between zero and
(number of pixels - 1). Whenever the value equals the number of pixels then it means no contrast condition.
Operator Width Screen
For width measurement applications the operators
can set the job by navigating to the width menu on
the operator settings screen. If one sensor is used
for width measurement, the controller should be
in edge mode with sensor configuration to be in
center sensor. If two sensors are used to measure
web width, then the sensor should have the
corresponding left and right sensor configuration
for the respective edge of the web. It is also
possible to measure (1) the width of a contrasting
feature with two sensors, and (2) the width of two
strips of web with two sensors. Please consult the
factory for these advanced functionality.
Nominal Width
For each job the operator can set a nominal width (in millimeters) by pressing the nominal width button.
When the button is highlighted in green the operator can change the value by using the -ve (left arrow) and
+ve (right arrow) arrows on the bottom. Depending on the magnitude selected (pressing the appropriate
magnitude value will highlight the button to green) each press can change the value by 0.25 mm, 1 mm, 10
mm or 100 mm. The nominal width value is used to compute the width error based on the measured width.
NOTE:
The minimum value for nominal width that can be set is 1 mm and the maximum value is 9750 mm.
Content subject to change without notice
SCU5: Sensor and Web Guide Controller User Manual v 3.6| Page 32
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