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2 - Fagor Automation

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Considerations to bear in mind in the previous examples<br />

The auxiliary 24 V DC power supply must be independent from the<br />

power controlled by external main contactor - KM1.<br />

To achieve PL d or SIL 2, the safety controller must check the feedback<br />

of the STO safety function; i.e. the feedback of the Drive Enable<br />

(state of the internal contact through AS1- AS2) and the feedback of<br />

external main contactor - KM1 (status of the KM1 contact) at all the requests<br />

of the STO safety function.<br />

Functional safety<br />

FUNCTIONAL SAFETY<br />

Examples 9.<br />

DDS<br />

HARDWARE<br />

Ref.1307<br />

317

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