Siemens SINUMERIK 840Di Function Manual page 1656

Detailed Description
2.3 Feedrate control
Programmable servo parameter set
SCPARA[Axis] = ...
SCPARA[axis]= ... can be used to program the parameter set (consisting of MDs) in the
part program and in synchronized actions (previously, this could only be done via the PLC).
SCPARA[Axis]=
<value>
DB3n DBB9 bit3
To prevent conflicts between the PLC user request and NC user request, a further bit is
defined on the PLC→NCK interface:
DB3n DBB9 bit3 "Parameter set selection by SCPARA disabled".
The PLC user is thereby able to set up a structured sequence when using PLC parameter
switchover and entries from synchronized actions or part programs simultaneously.
On a change of bit 3 (0 ⇒ 1 or 1 ⇒ 0), the entry is written to bits 0 - 2.
Note
If parameter set selection via SCPARA is disabled, there is no error message if the latter is
programmed nevertheless.
The current parameter set can be scanned by system variable $AA_SCPAR[Axis].
Example:
...
N100 SCPARA[X]=3
...
Constraints
• Different end-of-motion criteria will affect how quickly or slowly part program blocks are
• The PLC user program must be expanded if the servo parameter set is to be changed
• After POWER ON, the following initial settings are made:
Percentage acceleration override for all single-axis
interpolations
End-of-motion criterion for all single-axis interpolations
Servo parameter set defined by the NC
2-48
Where
completed. This can have side effects for technology cycles and PLC user parts.
both inside a part program or synchronous action and the PLC.
Axis = Channel axis name (X, Y ....), spindle (S1, ...)
Value = Desired parameter set (1≤ value ≤ 6)
; The 3rd parameter set is selected for axis X.
Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0
100%
FINEA
1
Feeds (V1)