Manual
9-12 Vision Systems
Operation
The sections below are an overview of the hardware operation of the AV-2550 system.
Theory of Operation
Refer to Figure 9 –3.
The camera turns ON and the image is processed through the Cognex Vision Processor and
is displayed on the monitor. The camera generates a crosshair over the image. The crosshair
is calibrated to the XY location using a Fluidmove setup routine.
After calibration, the dispensing head, camera and light ring are moved to a fiducial location
on a workpiece. The crosshairs are centered on a fiducial by using the direction controls on
the Dispenser Control Panel. The type of fiducial, either an edge or model, is chosen by the
programmer. Each type of fiducial has parameters that can be defined by the programmer.
Light level and similar parameters are adjusted using the vision system menu. The
maximum area in which the vision system searches for the fiducial is also defined using the
vision system menus. The image and the XY location of the fiducial are stored in the vision
system memory.
The vision system now attempts to locate the fiducial that was defined. The vision processor
recalls its location and moves the camera to an area within the defined search area. It adjusts
the light levels and parameters as defined. The vision processor looks for an image in the
defined area that matches the defined fiducial image. When it finds a fiducial, the vision
processor tests the image for a match. The results of the test are sent to Fluidmove and a
message is displayed indicating whether the fiducial was found or not. The fiducial search
instructions are automatically inserted into the dispensing program.
During production runs, Fluidmove calls the vision system when a fiducial-find instruction
is encountered in the program. The vision system searches for the fiducials as described
above.
Operation Controls
In FMW, the parameters that control the search characteristics, camera control and light
levels, are located in the vision system menus. These menus are accessed through FMW.
Refer to Fluidmove User Guide or on-line Help.
For FMDOS, read the Fluidmove DOS 3.3 Addendum: AV-2550 Automatic Fiducial
Locating System before programming, editing and running programs with fiducials.
The AV-2550 Vision System cannot be run from Download Mode. The
system computer must be used to complete the search routines.