Rockwell Automation Publication 442L-UM005B-EN-P - April 2017 47
Mounting Chapter 4
Figure 19 - Minimum Distance to the Hazardous Area
The minimum distance S as defined in EN ISO 13855 and EN ISO 13857
depends on the following:
• Stopping/run-down time of the machine or system
(The stopping/run-down time is shown in the machine documentation
or must be determined by taking a measurement.)
• Response time of the SafeZone Mini device
• Reach or approach speed
• Resolution of the SafeZone Mini device
Calculate Minimum Distance S
See EN ISO 13855. Calculate S with the following formula:
S = 2000 × (T
M
+ T
S
) + 8 × (d - 14) [mm]
The reach/approach speed is already included in the formula.
• If the result S is ≤ 500 mm (19.7 in.), then use the determined value as
the minimum distance.
• If the result S is > 500 mm (19.7 in.), you may be able to reduce the
minimum distance with the following calculation:
S = 1600 × (TM + TS) + 8 × (d – 14) [mm]
• If the new value S is > 500 mm (19.7 in.), then use the newly calculated
value as the minimum distance.
• If the new value S is ≤ 500 mm (19.7 in.), then use 500 mm (19.7 in.) as
the minimum distance.
Variable Description
T
M
Stopping/run-down time of the machine or system
T
S
Response time of the SafeZone Mini device
d Resolution of the SafeZone Mini device [mm]
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