Programmable Servo Parameter Set (Scpara) - Siemens Sinumerik 840D sl Programming Manual

Special Motion Commands

4.12 Programmable servo parameter set (SCPARA)

4.12 Programmable servo parameter set (SCPARA)
Function
The parameter set (comprising MDs) in the part program and in synchronized actions can be
programmed using SCPARA (up until now, only via the PLC).
DB3n DBB9 bit3
To ensure no conflicts occur between PLC and NCK, an additional bit is defined on the PLC
→ NCK interface:
DB3n DBB9 bit3 "Parameter set selection by SCPARA disabled".
If the parameter set input for SCPARA is inhibited, then an error message is not output if this is
even programmed.
Syntax
SCPARA[<axis>]=<value>
Significance
SCPARA
<axis>
<value>
Note
The actual parameter set can be interrogated using the system variables
$AA_SCPAR[<axis>].
For G33, G331 or G332, the most suitable parameter set is selected by the control.
The PLC user program must be expanded if the servo parameter set is to be changed in a
part program, synchronized action or the PLC.
References:
/FB1/ Function Manual Basic Functions; Feedrates (V1),
"Feedrate Impact" section.
Example
Program code
...
N110 SCPARA[X]= 3
...
288
Define parameter block
Channel axis name (X, Y, ...)
Desired parameter block (1<= value <=6)
Comments
; The 3rd parameter set is selected for axis X.
Programming Manual, 02/2011, 6FC5398-2BP40-1BA0
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