Detailed Description
2.3 Feedrate control
Feeds (V1)
2-48 Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0
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).
Axis = Channel axis name (X, Y ....), spindle (S1, ...)
SCPARA[Axis]=
<value>
Where
Value = Desired parameter set (1≤ value ≤ 6)
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 ; The 3rd parameter set is selected for axis X.
...
Constraints
• Different end-of-motion criteria will affect how quickly or slowly part program blocks are
completed. This can have side effects for technology cycles and PLC user parts.
• The PLC user program must be expanded if the servo parameter set is to be changed
both inside a part program or synchronous action and the PLC.
• After POWER ON, the following initial settings are made:
Percentage acceleration override for all single-axis
interpolations
100%
End-of-motion criterion for all single-axis interpolations
FINEA
Servo parameter set defined by the NC 1
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