Minimum Distance From Reflective Surfaces - Siemens SIMATIC FS400 Anleitung

6.1.5 Minimum distance from reflective surfaces

WARNING
Reflective surfaces near optical protective devices can indirectly deflect the
transmitter's beams into the receiver. This can cause an object in the protective field
not to be detected! All reflective surfaces and objects (material containers, cans, etc.)
must therefore be kept at a minimum distance "a" from the protective field. The
minimum distance depends on the distance "b" between the transmitter and the
receiver.
a = Distance
b = Protective field width
c = Reflective surface
Fig. 6.1-5: Minimum distances from reflective surfaces
With the calculation of the minimum distance to reflective surfaces it must be ensured
that with a protective field width of 3 m or less, at least a minimum distance of 131 mm
is achieved. With protective field widths over 3 m the minimum distance "a" is
calculated using the following formula:
a [m] = 0.044 x b [m]
152
a
b
c