Allen-Bradley RightSight 42EF Series User Manual page 50

Exploring the 42EF IO-Link Parameters
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Controller Tags
In the Controller Tag view, it is possible to view the status of the sensor process
data (The process data values are not viewable in the Add-on Profile.).
Triggered: This process bit toggles between one or zero depending on the
polarity configuration when the sensor detects the target or not. For diffuse
sensors, this bit displays a zero by default when no target is present and a one
when target is present. For Polarized Retroreflective and Transmitted Beam
sensors this bit displays a one by default and a zero when the target is blocking the
reflector and the target.
MarginLowAlarm: This process bit toggles between one and zero to indicate if
there is enough margin to ensure reliable target detection. This bit will be one
when the target is marginal (signal strength is above 0.5X and below 2X) and
zero when the light levels are above the operating margin if the triggered bit is
active. The table below describes the significance of both bits when evaluated
together:
Rockwell Automation Publication 42EF-UM001A-EN-P - September 2015