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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4 Conclusion
The results of our safety analysis confirm that AC500 digital standard I/O channels can
be used in functional safety applications up to PL c (ISO 13849-1). The functional
safety calculation according to IEC 62061 standard (applications up to SIL CL 1) can
be similarly done, if required.
DANGER
The presented approach enables the usage of AC500 digital stand-
ard I/O modules in functional safety applications up to PL c (ISO
13849-1). However, the implementation, verification and validation
of the approach in practice according to ISO 13849-1 and/or IEC
62061 will remain always application specific because standard
(non-safety) AC500 modules become involved in the execution of
functional safety functions. Thus, the responsibility for correct im-
plementation, verification and validation of the proposed approach
is fully within the end-customer responsibility.
In special cases, digital standard I/O modules from AC500 platform can be also used
in functional safety applications up to PL d (ISO 13849-1) and SIL CL 2 (IEC 62061).
However, more detailed functional safety application analysis is required (contact
AC500 technical support at www.abb.com/PLC for more details), which is not shown
in this document.
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