Note
1
: The 9202 contains no lifetime limiting components, therefore the PFH
figures are valid for up to 12 years, according to IEC 61508.
Note
2
: The maximum frequency for Pulse Isolator 9202 with relay output is 20 Hz.
The user must calculate the product lifetime with regard to the relay lifetime.
8. Hardware and software configuration.
All configurations of software and hardware versions are fixed from factory, and
cannot be changed by end-user or reseller.
This manual only covers products labelled with the product version (or range of
versions) specified on the front page.
9. Failure category
10. Periodic proof test procedure
This test will detect approximately 95% of possible “du” (dangerous undetected)
failures in the pulse isolator. The proof test is equivalent to the functional test.
11. Procedures to repair or replace the product
Any failures that are detected and that compromise functional safety should be
reported to the sales department at PR electronics A/S.
Repair of the module and replacement of circuit breakers must be done by PR
electronics A/S only.
12. Maintenance
No maintenance required.
Step Action
1 Bypass the safety PLC or take other appropriate action to avoid a false trip
2
Connect a simulator identical to the input setup
3
Perform an ON / OFF signal for each channel
4
Observe whether the output channel acts as expected
5
Restore the input terminals to full operation
6
Remove the bypass from the safety PLC or otherwise restore normal operation
Failure category
Failure rates (1/h)
Relay Opto
Fail Safe Detected 0.000E+00 0.000E+00
Fail Safe Undetected 2.897E-07 2.755E-07
Fail Dangerous Detected 1.303E-07 1.356E-07
Fail Dangerous Undetected 4.658E-08 3.618E-08
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