Omron ZX Series Operation Manual page 60

Reflective Sensor Heads: RUN M ode Functions
Example: Use Zero Reset to Evaluate the Height of a Step in the Sensing Object
Sensing object
Measured value
Without zero
reset
With zero
reset
Example: Zero Reset During Measurement
In this case, disabling the zero reset memory is recommended.
POINT
40
Sensor Head
Zero
reset.
The height of the step is always
evaluated in comparison to
the threshold.
Refer to 3-5-15 Zero Reset Memory Function.
This height must be evaluated.
All that is necessary is to reset
zero at the point indicated by the
arrow while measuring.
set to an absolute height.
Zero
reset.
Time
Section 3-3
Threshold
Threshold must be
Accurate measurement
is impossible.
Threshold
Zero reset level