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3 Part Names and Functions
NX-series Safety Control Unit User’s Manual (Z930)
3-1 Safety CPU Unit
3
3-1-2 Indicators
The VALID indicator shows whether safety validation has been performed.
Refer to 8-3 Operating Modes of the Safety CPU Unit on page 8-11 for details on the relationship
between the operating modes of the Safety CPU Unit and the indicators.
VALID Indicator
Color Status Meaning
Yellow Lit. Safety application data from the execution of the safety validation
is stored in the non-volatile memory.
--- Not lit. Safety application data from the execution of the safety validation
is not stored in the non-volatile memory, or a fatal fault has
occurred.
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