SafeShield Safety Light Curtain Hardware User Manual
37
Response Time
The response time depends on the following parameters:
• Number of beams
• Beam coding
• Configuration of floating blanking
• Number of cascaded systems
How to determine the response time of the system:
➢ Read the response times of the individual systems (shown on
type label). Note whether the system is operated with or
without beam coding.
Note If you are planning the application without actually having
any devices available, you may also determine the response
time using Table 26 on page 37 and Table 27 on page 38.
When determining the number of beams in Table 26, the
physical resolution is important. The physical resolution of
the light curtain does not change even if fixed or floating
blanking has been selected.
➢ Fill out the following table to determine the total response time.
Table 25: Determining the response time of a SafeShield safety light
curtain system
➢ Verify that the total response time determined is ≤108ms.
EN 61 496 does not permit response times exceeding 108ms. If
necessary, adjust the configuration.
Line Required Detail Response Time
1Host ms
2Guest1 + ms
3Guest2 + ms
4 Only if floating
blanking is used:
Greatest response
time from lines
1 to 3: × 0.5 =
+
ms
Deduct 4ms here. – ms
5 If single guest is used, then add 8ms here. (If
no guest is used or two guests are used, do
not add anything here.)
+
ms
6 Total response time to be taken into
account (The total response time
must be ≤ 108ms!)
=ms
Example
Calculating the response time for a cascaded system without beam
coding in which fields are configured with floating blanking:
Table 26: Number of beams depending on the protective field height and
the physical resolution
Line Required Detail Response Time
1 Host: 750mm protective field height,
resolution 14mm
16ms
2 Guest 1: 300mm protective field height,
resolution 40mm
+9ms
3 Guest 2: — + 0ms
4 Only if floating
blanking is used:
Greatest response
time from lines
1 to 3: 16ms
× 0.5 =
+
8ms
Deduct 4ms here. – 4ms
5 If single guest is used, then add 8ms here. (If
no guest is used or two guests are used, do
not add anything here.)
+
8ms
6 Total response time to be taken into
account
= 37ms
Protective Field
Height [mm]
Number of Beams for Physical Resolution
14mm 30mm
300 40 15
450 60 23
600 80 30
750 100 38
900 120 45
1050 140 53
1200 160 60
1350 180 68
1500 200 75
1650 220 83
1800 240 90
