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Safety-relevant conditions
5
Installation requirements
5.1.2
DC 24 V voltage supply
18
Manual – DFS21B PROFINET IO Fieldbus Interface with PROFIsafe
The 24 V supply voltage(s) of the DFS21B and all stations connected to the fieldbus
must be designed as safety extra-low voltage. The voltage must be within the limits
specified in the technical data. In addition, the following voltage values must not be ex-
ceeded if a fault occurs (according to EN 60950): Max. DC 60 V, max. DC 120 V for
200 ms.
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