12.4
Timing behavior of the OSSDs
The safety laser scanner tests the OSSDs immediately after switch on and then at regu‐
lar intervals. For this purpose the device briefly switches off both OSSDs (for 300 µs)
and checks whether the OSSDs switch to the OFF state during this time.
NOTE
The controller must not respond to this test pulse. It must not shut down the machine
due to the test pulse.
≈ 5 ms
/15 ms
1
2
3
1
2
3
OSSD2
OSSD1
120 ms/
240 ms
120 ms/
240 ms
120 ms/
240 ms
t
t
4
Figure 92: Diagram of the test pulse at the OSSDs
4
0.5 × basic response time
Approx. 5 or 15 ms
7)
after the OSSDs are switched on, the device performs the first
voltage test
1
and then after a half basic response time a second voltage test
1
.
After a further half basic response time of the device there is a shut-down test
2
, 120
or 240 ms
7)
later a further voltage test
3
. Then the device performs a shut-down test
and a voltage test alternately at an interval of 120 or 240 ms
7)
Pulse duration for the
individual tests,
,
.
7)
At 0.5° or 0.25° angular resolution.
TECHNICAL DATA
12
8009942/ZA18/2019-11-14 | SICK
O P E R A T I N G I N S T R U C T I O N S | S3000
149
Subject to change without notice
