Roland Double Sheet Detector R1000 Series Manual page 56

Communication with the PLC
6.2.2 Signal "Warning"
The "Warning" signal is an additional output signal with fixed evaluation thresholds.
The signal becomes activated if the measurement result is below 80% or above 120% of the preset
nominal value.
Application:
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Double Sheet Detector-series I20
If the warning signal is activated though a sheet is between the sensors, measuring
problems might have been occurred:
• Sensor distance changed
• Sheet too close to the transmitter / receiver
• Wrong type of sheet
• Sensor covering not sufficient (3 × sensor diameter)
If these requirements are met, but a warning signal is issued, then the
Note
Teach-In must be repeated. The requirements from section "4.3 Sensor
mounting" should be observed.
The signal will also be activated if measurements without a sheet
Note
(measurement value below 80%) are performed.
Manual
B0069991 / Rev. 1.7