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GridScan/LR
7.1
OSSD (Output Signal Switching Device)
Light beams
interrupted
OSSD (Out 1)
Figure 13: Timing diagram - OSSD output
7.2
Test input
Test input (In 1)
OSSD (Out 1)
Figure 14: Timing diagram - Test input
The input must switch to LOW, so that the internal test can be carried out. The light curtain will start testing its internal
safety functions. Within 5 ... 20 ms after the test signal goes from HIGH to LOW, the OSSD is switched off.
When this internal test has been successfully completed, no beam is interrupted, and the test signal switches from von
"LOW" to "HIGH", the OSSD status switches to "ON" (see Figure 14).
On the other hand, if the internal test detects an error, the GridScan/LR cannot be used safely and the OSSD status
remains at "OFF" (see also Chapter 5.1).
7.3
Outdoor applications
When the GridScan/LR is mounted in an outdoor application, its multi-scan feature ensures reliable operation under
normal environmental conditions. This can be done by connecting the gray wire to U
covered that no raindrops remain on the lenses.
The change using the multi-scan has an impact on the timing:
free
Light beams
interrupted
HIGH
Test input (In1)
LOW
ON
OSSD (Out 1)
OFF
t
1
Figure 15: Timing diagram – multi-scan feature
With the gray wire connected to GND (0 V), the timing is as described in Chapter 7.1 and 7.2.
© CEDES | V 2.0
free
ON
OFF
t
1
t
2
HIGH
Test cycle
LOW
ON
OFF
t
1
t
2
t
t
3
t
2
t
3
t
3
t
4
6
t
5
Response time on
OSSD at 20 elements
Min. off-time
Rise time
Time
Response time on
test at 8 elements
Test signal time
t
Restart time
t
Test input HIGH
Test input LOW
OSSD HIGH
OSSD LOW
. Ensure the GridScan/LR is so
SP
Time
Response time on
OSSD
Min. off-time
Rise time
Response time on
test
Test signal time
Restart time
English
Time
Value
t
< 50 ms
1
t
> 80 ms
2
t
< 50 ms
3
Value
t
5 ... 20 ms
1
> t
2
1
< 100 ms
3
Value
> 9.0 V
< 5.0 V
> 7.5 V
< 3.5 V
Value
t
< 130 ms
1
t
> 80 ms
2
t
< 50 ms
3
t
> 150 ms
4
t
> t
5
4
t
< 50 ms
6
9
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