KEYENCE SL-V Series User Manual
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Safety Distances
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In
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SL-V-M-NO3-E
Example 1: ISO13855 (EN ISO13855)
Safety distance calculation according to ISO13855:2010 (EN ISO13855:2010) (in a case where the
detection zone is orthogonal to the direction of approach)
Formula S= K x T + C..... (A)
S : Safety distance (mm)
K : Approaching speed of the body or the parts of body into detection zone (mm/s)
T : Overall system stopping performance (s) (T= t1 + t2)
t1 : SL-V maximum response time
See "Response time (OSSD)" (page 7-7)
t2 : Maximum time required by the machine to stop after receiving the signal from protective
equipment (s) (SL-V)
C : Additional distance (mm) calculated from the SL-V detection capability.
Calculation example for a detection capability of 40 mm (1.57") or less
The safety distance is calculated using Formula (A) and the parameters established in ISO13855 (EN
ISO13855) with K = 2,000 mm/s and C = 8 (d - 14 mm (0.55")). C is a value determined from the d :SL-
V detection capability diameter (mm) and must be equal or greater than 0. This section provides an
example of the calculation when using the SL-V08H (8 beam axes).
S= 2,000 mm/s x (t1 + t2) + 8 (d - 14 mm (0.55"))..... (B)
When t1 = 7 ms, t2 = 50 ms, d = 25 mm (0.98"):
S= 2,000 mm/s x (0.007 s + 0.05 s) + 8 (25 mm (0.98") - 14 mm (0.55")) = 202 mm (8.58")
The safety distance calculated using Formula (B) above must be 100 mm (3.94") or more. (From
ISO13855 Clause 6.2.3 and EN ISO13855 Clause 6.2.3)
If on the other hand the safety distance calculated using Formula (B) above exceeds 500 mm
(19.69"), set K = 1,600 mm/s and calculate the safety distance again using Formula (A).
When the calculated safety distance is less than 500 mm (19.69"), use a safety distance of S = 500
mm (19.69"). (From ISO13855 Clause 6.2.3 and EN ISO13855 Clause 6.2.3)
Calculation example for a detection capability of 40 mm (1.57") or more and 70 mm
(2.76") or less
This section provides an example of the calculation when using the SL-V30L (30 beam axes).
The safety distance is calculated using Formula (A) and the parameters established in ISO13855 (EN
ISO13855) with K = 1,600 mm/s and C = 850 mm (33.46").
S= 1,600 mm/s x (t1 + t2) + 850 mm (33.46")
When t1 = 10 ms, t2 = 50 ms,
S= 1,600 mm/s x (0.01 s + 0.05 s) + 850 mm (33.46") = 946 mm (37.17")
Accordingly, the safety distance for this application is S = 946 mm (37.17").