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"Read settings" Group
You enter the parameters for image evaluation in the "Read settings" group.
Note
The parameters in the "Read settings" group are exactly the same as in the
Settings > Read menu on the processing unit.
You select the shutter speed in the "Shutter speed" box (range of values: 1 through
20000 µs) and the brightness in the "Brightness" box (range of values: 10 through
500).
In the "Cycle time" input box, you enter the time between two trigger signals. This
time is the maximum time available to VS 130 for image evaluation.
Before explaining the cycle time setting in greater detail, two definitions of
processing parts with data matrix codes are required:
•
Asynchronous parts processing: Parts arrive at the VS 130 and are further
processed depending on the time require for evaluating their data matrix code.
The process "waits" for the result of the VS 130 evaluation and other parts
arriving are temporarily buffered.
•
Synchronous parts processing: Parts arrive at the VS 130 at intervals decided
by the process and must be further processed "just in time" (example:
conveyor belt).
Type of Parts Processing
Asynchronous
Synchronous
Vision Sensor VS 130
A5E00199459-01
Cycle Time Setting
Set the cycle time to several seconds to obtain as high a
code recognition rate as possible.
Note: The evaluation time is generally well below this value,
so that the average part throughput will be higher than when
the evaluation time is set to the same time as cycle time.
Set the cycle time to a value less than the time available per
part. The result will be available at the latest when cycle time
expires.
Note: In some situations, the reliability of detection may not
be as high as with asynchronous part processing. This does
not apply if the time available per part is in the range of
several seconds. In this case, the cycle time can also be set
generously.
Appendix
A-21
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