•
A background object in the protective field level at a distance of ≤ 250 mm from
the protective field is to be expected.
•
At least one distance value of the 32 segments exceeds the value listed in the
following table. For each created field, you can check the distance values of all 32
segments in the configuration report (
see "Report (Safety Designer)", page 57
Table 4: Maximum distance value without interference by background objects
Object resolution (mm)
Maximum distance value (mm)
50
280
70
400
150
850
200
1140
The Z
E
supplement must be taken into account in addition to the generally required tol‐
erance zone TZ (100 mm). In sum, this results in a required protective field supplement
of 320 mm for the relevant applications.
4.3.7.3
Minimum distance for stationary applications
Overview
You must ensure the minimum distance between the protective field and hazardous
point is adhered to. The minimum distance means that the dangerous state can be
ended in good time before the person reaches the hazardous point.
Minimum distance for stationary applications
The calculation of the minimum distance is based on international or national stan‐
dards and statutory requirements applicable at the place of installation of the machine.
If the minimum distance is calculated according to ISO 13855, then it depends on the
following points:
•
Machine stopping time (time interval between triggering the sensor function and
the end of the machine’s dangerous state, if necessary including signal propaga‐
tion times in the network and processing time in the control)
•
Response time of the protective device
•
Reach or approach speed of the person
•
Resolution (detection capability) of the safe multibeam scanner
•
Type of approach: orthogonal for access protection
•
Switching time between monitoring cases
•
Supplement to prevent reaching through
Complementary information
Additional information is available in the ISO 13855 standard and in the Guide for Safe
Machinery from SICK.
SICK offers a stopping/run-down time measurement service in many countries.
Further topics
•
"Response time of the safe multibeam scanner", page 19
•
"Monitoring case switching", page 19
PROJECT PLANNING
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