Rockwell Automation 440F MatGuard, 440F-C4000 Mat Controllers - Manual (Page 19)

Fig. 12 FLOW CHART SHOWING METHODOLOGY
The minimum distance calculated is the minimum horizontal distance from the outer edge of the sensor
mat detection zone to the nearest part of the hazard.
The EN 999 formula for floor mounted safety mats is S = (1600 x T) + 1200mm
S is the minimum safety distance in millimetres
The factor of 1600 is based on the standard assumption of 1600mm/s as the approach speed.
T is the overall stopping time in seconds
The added 1200mm is parameter C given in EN 999 and takes into account stride length
and arm reach.
NO
YES
NO
NO
YES
YES NO NO
YES
Are specific formulae or
minimum distances given
in Type-C standards ?
Determine the minimum
distance according to the
Type-C standard
Use this minimum
distance
Calculate minimum
distance by the formulae
in prEN 999
Can this minimum
distance be achieved ?
Does the minimum
distance allow persons to
be within the danger zone
without being detected ?
Use this minimum
distance together with
supplementary measures
depending on the risk Use this minimum
distance
Can overall response
time be reduced or can
parameter C be
reduced ?
Reduce overall response
time and/or reduce
parameter C
Use additional or
alternative protective
equipment
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