Chapter 12 Operating instructions
S300
118 © SICK AG • Industrial Safety Systems • Germany • All rights reserved 8010948/YY96/2016-02-17
Subject to change without notice
Technical specifications
12.3 Timing behavior of the OSSDs
T
he S300 tests the OSSDs immediately after switch on and then at regular intervals. For
this purpose the S300 briefly switches off both OSSDs (for 300 µs) and checks whether
the OSSDs switch to the OFF state during this time.
Ensure that the safety inputs on the controller used do not respond to these test pulses
and as a result cause the machine or system to unintentionally shutdown!
Approx. 35 ms after the switch on of the OSSDs, the S300 performs the first voltage test
and then after a half basic response time (40 ms) performs a second voltage test.
After a further half basic response time of the S300 there is a shut-down test , 120 ms
later a further voltage test . Then the S300 performs a shut-down test and a voltage test
alternately at an interval of 120 ms. Fig. 80, Fig. 81 and Fig. 82 show the pulse duration
for the individual tests.
Note
pulses at the OSSDs
35 ms
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