Festo Checkbox Compact CHB-C-C Manual page 115

A. Technical appendix
Example
Festo P.BE-CB-COMP-EN en 0211a
Ascertaining the bandwidth for the feature "Length" of a con-
veyed part with a set tolerance of 5 % (display on the LCD
TOLERANCE).
Conveyed part lengths [mm] for 5 sample parts ascertained
during the teach procedure: 60
Therefore:
A = 61.2 mm
C = 65 mm
max
C = 60 mm
min
T = 5 %
+ 2 × T × A
B = C − C
max
min
B = (65−60) + 2 × 5 × 61.2
100
B = 11.12
B
C 68.06
max tol
C
65.00
max
61.20
A
60.00
C
min
C
56.94
min tol
1
Bandwidth of conveyed part length
2 Bandwidth with 5 % tolerance
Result: All conveyed parts with a length of 57...68 mm are
classified as good parts. The Checkbox ascertains appropri-
ate value ranges for each feature.
60 61 65 60
Average value of the length
Length – maximum
Length – minimum
Tolerance
100
1 2
A-13