Kuhnke Electronics Instruction Manual

Remanent Data
• Step2: Define extraremanent data structure
� Go to tab "Data Types" and define the structure of
extraremanent data to be stored.
� Attach "Magic Numbers" to the beginning and end of
every block. Magic numbers are written once in a
defined manner and should be checked every time
the controller is switched on. They can be used to
verify whether the extraremanent data memory works
properly (e.g. battery charge status).
� Operating hour counter data block:
This structure is an example of some system data
such as a counter for system starts or an operating
hour counter.
(* What magic_numbers are good for:
The extraremanent data of this structure are regarded as valid only
if the magic_numbers return the correct value, in this case:
16#47110815. If not you can go to CheckXREMDATA and remove the
structure.*)
TYPE SystemData:
STRUCT
END_STRUCT
END_TYPE
magic_number:DWORD; (* key for the validity of
the extraremanent data *)
noof_SystemStarts:UDINT; (* count of system starts *)
secs:INT; (* second count *)
mins:INT; (* minute count *)
hors:INT; (* hour count *)
days:INT; (* day count *)
dummy:INT;
dummy2:INT;
magic_number2:DWORD; (* key for the validity of
the extraremanent data *)
120 E 700 GB