Differential color detection with Profinet connectivity

Differential color detection with Profinet connectivity

The CROMLAVIEW® CR200PN color sensor processes colors in a perceptual way (i.e. according to human perception). The two channels allow for applications that demand high standards of the sensor technology. By using the second color sensor channel this sensor can be used in different modes of operation.
For easy integration in industrial automation, the CR200PN has been equipped with a Profinet interface. This interface is frequently used for the control of sensors and actuators in production engineering. The control itself is performed by a central control (SPS), which often plays an important role in standard diagnostic options.


  1. In the dual channel mode the sensor can be operated as two single sensors, which work with the same gain and illumination intensity.

  2. With the activated stabilization function (CROMLASTAB®) the sensor can be used with an external stabilization target as a single channel sensor. The symmetric design of the sensor facilitates very high drift stability against age and temperatures.

  3. In the color difference mode, compliance and synchronism between the two sensing channels are crucial. The balancing method CROMLABALANCE® is available for this purpose. It allows for simple and effective channel balancing over the client's entire color space. When teaching in a "zero-difference" between the two color channels, test objects can be inspected for color identity, even if the absolute color has not been fixed. A zero-difference can also be used for edge detection. Another advantage of the color difference mode is the recognition of transparent objects against changing backgrounds (e.g. transparent labels in the packaging industry). Changing backgrounds can frequently occur in terms of deviations in height or structure of the object. Also in such cases, the color difference mode facilitates the recognition of colored structures, which would otherwise be impossible with an absolute measurement.


  • Two color sensing channels
  • Color differences can be detected and displayed
  • Up to 100 colors, respectively color differences can be stored
  • Quick response time from 50 µs
  • 12 channels, with binary encoding up to 4096 output combinations
  • Finest color differences can be detected (ΔE < 1)
  • Standard interfaces: USB, RS232, 12 push-pull outputs (24 V/100 mA)
  • Field bus interface: Profinet IO
  • PC software CR-tool for parameterization and visualization of color values

Technical Data

Sensing channels

  • 2 Sensing channels

Drift stabilization

CROMLASTAB® can be switched off

Receiving detector

Three range photo diode

Sensitivity steps

8 (1x, 4x, 20x, 40x, 80x, 200x, 400x, 800x)

Receiving signal resolution

3 x 4096 steps

Object illumination

  • Power white light LED
  • Adjustable (4096 steps)
  • Can be switched off

Response time

≥ 50 µs


  • 12 Switching outputs
  • 2 Control inputs
  • RS232
  • USB
  • Profinet IO


20 LEDs for outputs and status


3 Buttons for teach -in

Color resolution

ΔELab < 1


0 ms ... 65535 ms

Color output channels

12 (up to 100 with binary encoding)

Protection standard

IP 54

Power supply

18 ... 28 VDC, max. 500 mA

Case temperature during operation

-10 °C ... 55 °C

Coupling in signal path

Via optical fiber

Case size

100 mm x 70 mm x 30 mm


295 g


Dr. Gundolf Geske

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