BECKHOFF TwinSAFE - Manual (Page 102)

Circuit examples
100 Application Guide TwinSAFE
DC
avg
=
వవ%
ళల.భ
ା
వవ%
భబమఴ.ఴ
ା
వవ%
భభబఴ.ల
ା
వవ%
వభయ.మ
ା
వవ%
ళబలఱ.మ
ା
వవ%
ళబలఱ.మ
ା
వబ%
ఱరయ.ల
ା
వబ%
ఱరయ.ల
ା
వబ%
ఱరయ.ల
ା
వబ%
ఱరయ.ల
ା
వవ%
భబమఴ.ఴ
ା
వవ%
ఱరయ.ఱ
భ
ళల.భ
ା
భ
భబమఴ.ఴ
ା
భ
భభబఴ.ల
ା
భ
వభయ.మ
ା
భ
ళబలఱ.మ
ା
భ
ళబలఱ.మ
ା
భ
ఱరయ.ల
ା
భ
ఱరయ.ల
ା
భ
ఱరయ.ల
ା
భ
ఱరయ.ల
ା
భ
భబమఴ.ఴ
ା
భ
ఱరయ.ఱ
ൌ 96.51%
Notice
Category
This structure is possible up to category 4 at the most through the use of the type 4
(category 4) light curtain.
MTTF
d
Designation for each channel Range for each channel
low 3 years ≤ MTTF
d
< 10 years
medium 10 years ≤ MTTF
d
< 30 years
high 30 years ≤ MTTF
d
≤ 100 years
DC
avg
Designation Range
none DC < 60 %
low 60 % ≤ DC < 90 %
medium 90 % ≤ DC < 99 %
high 99 % ≤ DC
For practical usability, the number of the ranges was limited to four. An accuracy of 5% is assumed for the limit
values shown in this table.
Category B 1 2 2 3 3 4
DC
MTTF
d
none none low medium low medium high
low a - a b b c -
medium b - b c c d -
high - c c d d d e