Siemens SINUMERIK 840D sl Function Manual page 575

The selected format is applicable for the particular variable, as each variable can be assigned
an individual display format.
Further, various SPL states are displayed.
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 of these two values is
of interest.
Figure 11-13
The following colors are used to display the quality:
=
Light blue
Gray
SI communication
You can access the menu of the SI communication using the "SI communication" softkey.
Safety Integrated
Function Manual, 12/2017, 6FC5397-4BP40-6BA1
Display of the quality
"Process value": the actual value of the system variables (0 or 1) represents a
process value.
"Substitute value": the actual value of the system variables (0 or 1) represents
a (static or dynamic) substitute value; i.e. is currently not supplied with a process
value from one of the known sources.
"Not parameterized": the system variable (value 0 or 1) is, as a result of the MD
parameterization, not assigned to the known sources/sinks.
Diagnostics
11.1 Troubleshooting procedure
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