Application Note for “Usage of AC500 digital standard I/Os in functional safety applications up to PL c (ISO 13849-1)”, V1.0.0
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Figure 8. FSDT safety calculation for selected safety function
The safety calculation result (see Figure 8) is the PFHavg value of 3.32E-7 1/h for the
safety function (actuation of the “Off” switch S1, which leads to SS1 (Safe Stop 1) with
a controlled stop of the motor within a maximum permissible time).
NOTICE
The mission time for implemented safety functions up to PL c is 20
years and cannot be extended because standard components are
used in the input part of the safety function.
This value is better than the required limit value 4.50E-7 1/h (15 % of PFHavg (3E-6
1/h) from Table K1 of ISO 13849-1 for PL c), which means that the proposed approach
is suitable for usage in safety application up to PL c (ISO 13849-1).
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