© SICK AG • Presence Detection • Subject to change without notice • 8015887
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Operating instructions Register sensors RS25
Description of the operating modes and parameters
9.4
Teach-in background mode
The following table describes the "Teach-in background mode":
Description
Function
In this mode, the sensor reads the light remission values
of the background for all three colors.
→
See the figure
below.
The background values serve as the basis for the following
modes: "Teach-in printing marks", "Search/Teach-in key
code" and "RUN".
Activation
This mode must be activated via Ethernet Powerlink in the
"Operation mode" field. Once the teach-in process is com-
plete, or a fault has occurred, the mode will be deactivated
automatically. You can use the parameter "T
0
-Trigger" to set
the time for the reading window to be started.
Prerequisite
The following parameter must be set before starting:
• Δc: Reading window width. No print marks must be
located within the reading window.
The following value is delivered by the PLC:
• T
0
-Trigger
Feedback
The following data is sent from the sensor to the PLC.
• The main value of the light remission values within the
reading window
• The minimum and maximum contrast values of the
background for troubleshooting purposes.
Speed
The maximum speed is not restricted for this mode.
Table 10: Teach-in background mode
Trigger
∆
c
Stop
0
Start = T
Fig. 22: Explanation of Teach-in background mode
Δc Reading window with for the background
No print marks must be located within the reading window.
