Cognex Checker 3G Series, User Manual

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Part Finding Sensors and Trigger Types
Part Finding Sensors are used differently for different trigger types
With an Internal Trigger, a Part Finding Sensor is • required The Part Finding Sensor tells
Checker that a part is present
With an External Trigger, a Part Finding Sensor is optional If you do not use a Part Finding
•
Sensor, then the presence or measurement sensors will run in fixed positions. If you use
a Part Finding Sensor, then both the Part Finding Sensor and the External Trigger must
indicate a part before Checker will check it
In Free Running mode, a Part Finding Sensor is optional If you do not use a Part Finding
•
Sensor, then the presence or measurement sensors will run in fixed positions. If you use
a Part Finding Sensor, then the Part Finding Sensor must detect a part in an image before
Checker will check it
In all cases, if a Part Finding Sensor is used, then Checker uses the part’s detected location to
position the presence or measurement sensors
Modifying a Part Finding Sensor
You can change the location where Checker looks for the part by simply moving the Part
Finding Sensor search region
To change
what a Part Finding Sensor looks for, you must either
Create a new Part Finding Sensor in Setup mode •
Use the External Retrain feature in Setup mode or Run mode •
1 The feature Checker is looking for
2 The Search Region (where Checker looks for the feature)
Part Finding Sensor
A Part Finding Sensor detects and locates your part in the image You create a Part Finding
Sensor by drawing a box around a feature of part that is present on both good and bad parts