SICK EtherNet/IP microScan3 - Page 36

If the minimum distance is calculated according to ISO13855, then it depends on the
f
ollowing points:
•
Machine stopping time (time interval between triggering the sensor function and
the end of the machine’s dangerous state, including signal propagation times in
the network and processing time in the control)
•
Response time of the protective device, see "Response times", page 176
•
Reach or approach speed of the person
•
Resolution (detection capability) of the safety laser scanner
•
Type of approach:parallel
•
Parameters specified based on the application
•
Supplements for general and, possibly, reflection-based measurement errors
•
Supplement to protect against reaching over
•
Height of the scan plane
•
Switching time between monitoring cases
Important information
NOTE
A
dditional information is available in the ISO13855 standard and in the Guide for Safe
Machinery.
NOTE
SIC
K offers a stopping/run-down time measurement service in many countries.
Calculation example of the minimum distance S according to ISO13855
T
he example shows the calculation of the minimum distance for parallel approach
to the protective field. Depending on the application and the ambient conditions a
different calculation may be required. (e.g., a protective field or at an arbitrary angle to
the direction of approach or an indirect approach)
►
Calculate S using the following formula:
S = 1,600mm/s × T + TZ + Z
R
+ C
R
O
where:
°
S =minimum dis
tance in millimeters (mm)
°
T = stopping/run-down time for the entire system in seconds (s)
(Response time of the safety laser scanner + machine stopping time, incl.
r
esponse time of the machine control system and signal propagation time)
°
T
Z = tolerance zone of the safety laser scanner, see "Data sheet", page 171
°
Z
R
=supplement for reflection-based measurement errors in millimeters
(mm)
°
C
RO
= supplement to protect against reaching over, in millimeters (mm)
The reach/approach speed is already included in the formula.
Supplement Z
R
f
or reflection-based measurement errors
All devices: If there is a retroreflector in the vicinity of the protective device (distance
of the retroreflector from protective field ≤6m), you must take the supplement Z
R
=
350mm into account.
Devices with max. protective field range of 9m for stationary applications: Strongly
reflective surfaces (e.g. shiny metal, tile) with a distance from the protective field ≤6m
can behave similarly to a retroreflector if the laser beam hits the surface vertically. If
the protective field is larger than50% of the protective field range in the direction of
the laser beam which is hitting the surface vertically, you must take supplement Z
R
=
4 PROJECT PLANNING
36
O P E R A T I N G I N S T R U C T I O N S | microScan3 – EtherNet/IP™ 8020200/1NTM/2024-06-03 | SICK
Subject to change without notice