Deprag AST40-1 Operating Instruction Booklet page 34

7.6.1.3.6 Data backup
The command "Back up values" (Save values) can be used as frequently as required
during the screwdriving sequence, but only the last three values will be backed up. In case
of an error or a failure, the values are always saved.
The value last saved is always available in the range fd_Step3 / fd_Torque3 / fd_Angle3.
When using the "Save values" command multiple times in the screwdriver program, the
previous values are shifted upwards (fd_Step3  fd_Step2  fd_Step1).
If a fault occurs during a screw assembly, the screwdriving values for the incorrect step will
be saved in the area fd_StepNOk / fd_TorqueNOk / fd_AngleNOk.
Example:
fd_Step3
fd_Step3  fd_Step2
fd_Step3
fd_StepNOk
fd_Step2  fd_Step1
fd_Step3  fd_Step2
fd_Step3
fd_Step2  fd_Step1
fd_Step3  fd_Step2
fd_Step3
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