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May 22, 2023
EZ-SCREEN SLS Safety Light Curtain Instruction Manual
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WARNING:
Stop time (Ts) must include the response time of all devices or controls that react to stop the ma-
chine
If all devices are not included, the calculated safety distance (Ds or S) will be too short, which can
lead to serious injury or death.
Include the stop time of all relevant devices and controls in your calculations.
If required, each of the two machine primary control elements (MPCE1 and MPCE2) must be ca-
pable of immediately stopping the dangerous machine motion, regardless of the state of the other.
These two channels of machine control need not be identical, but the stop time performance of the
machine (Ts, used to calculate the safety distance) must take into account the slower of the two
channels.
The following examples show one calculation for US applications and one for European applications.
K
63 in. per second (the hand speed constant set by OSHA)
Ts
0.32 (0.250 second is specified by the machine manufacturer;
plus 20% safety factor; plus 20 ms for interface module IM-
T-9A response time)
Tr
0.023 seconds (the specified response time of
an
SLSP14-600 EZ-SCREEN SLS )
Dpf
3 in
Our example uses a 600 mm system with 14 mm resolution and Reduced Resolution ON, so Dpf is 3 inches. Response time
for this example is 0.023 seconds.
Substitute the numbers into the formula as follows:
Ds = K × ( Ts + Tr ) + Dpf
Ds = 63 × (0.32 + 0.023) + 3 = 24.6 in
Mount the EZ-SCREEN SLS emitter and receiver so that no part of the defined area will be closer than 24.6 in. to the closest
reachable hazard point on the guarded machine.
K
1600 mm per second
T
0.343 (0.250 second specified by machine manufacturer; plus
20% safety factor; plus 20 ms interface module response
time), plus 0.023 seconds (the specified SLSP14-600 re-
sponse time)
C
8 x (30 - 14) = 128 mm (14 mm resolution, Reduced Resolu-
tion ON)
Substitute the numbers into the formula as follows:
S = (K × T ) + C
S = (1600 × 0.343) + 128 = 676.8 mm
Mount the EZ-SCREEN SLS emitter and receiver so that no part of the defined area will be closer than 676.8 mm to the clos-
est reachable hazard point on the guarded machine.
Examples
Example Calculation for U.S. Applications
Example Calculation for European Applications
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