IDEC FS1A Controller - Manual (Page 391)

APPENDIX
A-3
APPENDIX
Example in which the direction of entry is horizontal to the safety light curtain
Access
Danger Zone
Protective
Area Limit
Use the following formula to calculate the minimum distance (distance to the farthest optical
axis).
S = K × (Tc + T1 + T2) + C
Tc = t1 + t2
C = (1200 – 0.4 × H)
K = 1600 (mm/s)
t1 = 0.04 (s)
t2 = 0 (s), 0.1 (s), 0.5 (s), 1 (s), 2 (s), 5 (s), 15 (s), 30 (s)
T1(s) (Check the specifications of the safety light curtain.)
T2(s) (Check the maximum time from when the safety output of the SafetyOne is turned OFF
when the hazard is stopped)
C = (1200 – 0.4 × Height of the optical axis H (mm)) (However, C ≥ 850 (mm))
The height of the maximum allowable optical axis (H) must be within a range of
15 (d – 50 (mm)) ≤ H ≤ 1000 (mm) .
Futhermore, when the valus of H calculated using H ≥ 15 ( d – 50 ) is H ≥ 300 (mm) , there is an
unexpected proximity risk in where objects can not be detected below the detection zone. This
must be taken into consideration for a risk assessment.