Construction, assembly and connection to power supply (AS-i)
16
RS4/AS-i
Leuze electronic
DEUTSCH
E
NGLISH
FRANÇAIS
IT
A
LIANO
ESPAÑOL
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EDERLANDS
4.2.1
Calculating the safety distance / total reaction time (total response time) for
AS-i applications
In general terms, the calculation that applies is in accordance with the following formula, in
keeping with EN 999, where S is the safety distance between the danger zone and the
protective field:
Here
Achtung!
See in this connection chapter 5.4.8 of the Connecting and Operating Instructions for the
ROTOSCAN RS4 laser scanner
Achtung!
The additional bus system reaction time that is required by the AS-Interface and the AS-i
safety monitor, coming to a maximum of 40 ms (when the full resources of the AS-Interface
system are installed with 31 slaves), must be added to the response time T.
S = (K xT) + C
C = 1200 mm – 0,4 H
C
MIN
= 850 mm
H
MIN
= 15(d - 15 mm)
H
MAX
= 1000 mm
S
is the minimum safety distance between protective field and danger zone, in mm
K
is the speed of approach of the person or part of the body, in mm/ms
T
is the overtravel time of the m the reaction time of the optoelectronic protec-
tive device (AOPD) + the reaction time of the AS-i bus system in ms
C
is a safety-related constant, to take into account penetration of the danger zone be-
fore the protective facility is triggered, unit in mm
C
MIN
is the minimum value of the safety-related constant (850 mm), unit in mm
H
is the height of the registration of measurement data taken from the reference point,
unit in mm
d
is the resolution of the scanner (70 mm, covering the entire protective field), unit in
mm
