ABB ACS580-04, Hardware Manual

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Functional safety components
The mission time of functional safety components is 20 years which equals the time
during which failure rates of electronic components remain constant. This applies to
the components of the standard Safe torque off circuit as well as any modules, relays
and, typically, any other components that are part of functional safety circuits.
The expiry of mission time terminates the certification and SIL/PL classification of
the safety function. The following options exist:
Maintenance 175