The reference surface (DATUM) detection indicator lights up when performing
reference surface detection. For more information, see "Reference surface
detection (DATUM) method (Application)" on page 5 of this Instruction Manual.
*2 The spot reflection indicator lights up during normal detection and turns off during
multiple reflection (when multiple peaks of received light intensity occurs due to
diffuse reflection), insufficient light intensity, and when the target is out of the
detection range.
*3 For more information about the CLP (clamp) function indicator, see "4. Clamp
function setting" on page 8 of this Instruction Manual.
*4 For more information about the timing input indicator, see "8. External input
setting" on page 8 of this Instruction Manual