G-2
G
Glossary
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Computer link
Programmable controllers (PC) are equipped with communication protocols. The "computer link" is used
to transfer data between the PC and an external computer, or the like, using this communication protocol.
The IV-S20 supports the computer link protocols used by Sharp, Omron, and Mitsubishi PCs. Therefore,
the PC does not need a custom communication program in order to create a computer link with the IV-
S20.
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Center of gravity
The "center of gravity" is the geographical center of the image. It is determined by treating the binary
image to be measured as an object that has mass.
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C mount
A system for mounting lenses on a camera body. The flange back (the distance from the reference level
for mounting a lens to the focal plane surface) is defined as 17.526 mm.
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CCD trigger
The CCD trigger allows sampling a part of the CCD camera image at high speed. When the sampled
image changes, the camera starts the shutter operation to capture a new image. With this build in shutter
operation, an external sensor, such as a photo sensor, is not needed to trigger the shutter. A window can
be created to trigger the shutter operation. The window can be set for each item on the production line so
that adjustments to the position of an external sensor are no longer needed. This feature reduces the
down time needed to change items on production lines.
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Contraction
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See "Expansion and contraction to eliminate binary noise in the image."
Variation in
lighting
Fixed
Fails to convert the image
due to a variation in lighting
Threshold correction value
Note: In order to use the THRESHOLD-
ADJ
(threshold adjustment
function), the monitor brightness
functions must be selected to
measure variations in lighting. If
you don't select the monitor
brightness function, a BINARY
CORR.: LIGHT LVL NOT SET
(correcting binary value: monitor
illumination not selected) error will
occur.
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Binary processing (fixed/threshold value correction)
By setting THESHLD. ADJ (threshold adjustment function), the IV-S20 can cope with variations in light-
ing.
[C]
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CCD (charge capture device)
A charge capture device (CCD) converts light into electric signals. It consists of a photo-electric converter
to convert light and store it as an electric charge signal, a scanner to read the stored electric charges, and
an output section to transmit the signals as a stream of data.
Item 1
Window for triggering the shutter operation
Item 2
Feed
direction
Feed
direction
