Siemens Sinumerik 840D sl Function Manual page 607

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Displaying the qualities of SPL input/output variables
Just displaying values "0" and "1" in the diagnostics screen is not sufficient to
identify the cause of faults that have occurred. For a more precise evaluation,
the quality (quality) of these two values is of interest.
Figure 10-13 Displaying the quality
The following colors are used to display the quality:
= "Process value": the actual value of the system variables (0 or 1) represents a
process value.
Light "Substitute value": the actual value of the system variables (0 or 1) represents a
blue (static or dynamic) substitute value; i.e. is currently not supplied with a process
value from one of the known sources.
Gray "Not parameterized": the system variable (value 0 or 1) is, as a result of the MD
parameterization, not assigned to the known sources/sinks.
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SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) - - 10.2015 Edition
Diagnostics
10.1 Troubleshooting procedure
Quality
10-607