9.2
Retentiveness of Data
Data is retentive if it is automatically saved when the PLC is stopped or power cycled.
The following data is retentive:
•
Program logic
•
Fault tables and diagnostics
•
Overrides
•
Word data (%R, %AI, %AQ)
•
Bit data (%I, %SC, %G, fault bits and reserved bits)
•
Word data stored in %Q and %M
•
Data in %Q or %M references that are used as function block outputs or with
retentive coils:
−
-(M)- retentive coils
−
-(/M)- negated retentive coils
−
-(SM)- retentive SET coils
−
-(RM)- retentive RESET coils
The last time a %Q or %M reference is used with a coil, the coil type determines
whether the data is retentive or non-retentive. For example, if %Q0001 was last
programmed as the reference of a retentive coil, the %Q0001 data is retentive.
However, if %Q0001 was last programmed on a non-retentive coil, then the %
Q0001 data is non-retentive.
•
%Q or %M references that have been made retentive by specifically declaring them
to be retentive. %Q and %M references default to nonretentive.
The following data is non-retentive:
•
The states of transition coils.
•
%T data
•
%S, %SA, and %SB data (but %SC bit data IS retentive)
•
%Q and %M references that have not been declared to be retentive.
•
%Q and %M references that are used with non-retentive coils:
−
-( )- coils
−
-(/)- negated coils
−
-(S)- SET coils
−
-(R)- RESET coils
116
GFK-1503E
VersaMax PLC User Manual
For public disclosure
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