Description – Rockwell Automation 42CRC Color Registration Control User Manual
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42CRC Color Registration Control
The Photoswitch Type 42CRC Series 4000 LED Color Registration Mark Control
with Automatic Gain Control (AGC) is a fixed focus diffuse-reflective scanning
device designed to detect pre-printed registration marks against contrasting
backgrounds. Detection of the marks is achieved by sensing the difference in the
gray-scale response to the mark and background.
This device has two sources of emitted light, a red and a green LED that
are selected by an operating-mode switch. The choice of a red or green
LED broadens the control’s capability of detecting a wide range of mark
and background colors.
A small light spot is projected on the material being scanned. The reflectiv-
ity of the material at the spot defines the level of the received signal.
Changes in the reflectivity, due to the contrast between the printed mark
and the background is recognized by the control, which provides an output.
This output can then be used by the packaging machine to properly cut,
seal, crimp, or fold packages or tubes.
The 42CRC Series 4000 also has a number of unique features that enhance
flexibility and reliability.
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An automatic gain sensitivity control permits fully automatic operation
eliminating the need for constant operator interface when mark to back-
ground colors change.
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A manual sensitivity selection mode enables the operator to fine tune the
control to detect poor quality marks.
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A built-in diagnostic system provides early-warning alarm indication of
gradual loss of operating margin due to changes in contrast, misalign-
ment, or dust prior to loss of output signal, avoiding unexpected process
disruption.
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Custom microcircuitry for very high sensitivity and increased intelli-
gence in a small workable package.
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Fast 250 microsecond response time.
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Latch or automatic reset functions.
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Adjustable output dwell time.
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Selectable light or dark mark detection.
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Continuous output short circuit protection.
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Reverse polarity protection.
Description