Rockwell Automation 8720MC Drives Integration Manual - Manual (Page 133)

Publication 8720MC-IN002A-EN-P — December 2002
Programming Parameters C-21
Name: Position Scaling Data Display: Bit Pattern R/W
Parameter No.
76
File:
Control
Group:
Position Description: Position data scaling type. A variety of scaling methods can be selected by means of the scaling
type parameter. This parameter applies to the SERCOS and 32 bit SCANport (DPI) configurations. By default the
analog version uses rotational and parameter scaling. For any analog application using positioning, as with spindle
orient, bit 7, Processing format, should be set to “modulo”. Resolution is determined by parameter 79.
Enumerated Bit Pattern:
Structure of position data scaling type:
Bits 2–0: Scaling method
000 – no scaling
001 – linear scaling
010 – rotational scaling
Bit 3:
0 – preferred scaling
1 – parameter scaling
Bit 4: Units for linear scaling or Bit 4: Units for rotational scaling
0 – meters (m) 0 – degrees
1 – inches (in) 1 – (reserved)
Bit 5: (reserved)
Bit 6: Data reference
0 – at the motor shaft
1 – at the load
Bit 7: Processing format
0 – absolute format
1 – modulo format (see parameter 103)
(all other bits are reserved)
This parameter is available with the 8720MC SERCOS interface.
Default:
x00x01010 Length
2 bytes SERCOS/DPI Min/Max
N/A SERCOS/DPI Scaling Resolution
N/A Units
N/A
Name: Posn_Scal_Factor Data Display: Integer R/W
Parameter No.
77
File:
Control
Group:
Position Description: Linear position data scaling factor. This parameter defines the scaling factor for all linear position
data in a drive. Parameter 77 applies to the SERCOS and 32 bit SCANport (DPI) configurations when preferred
scaling is not used. Parameter 79, not 77, is used for analog configurations.
This parameter is available with the 8720MC SERCOS interface.
Default:
1 Length
2 bytes SERCOS/DPI Min/Max
Min.
≥1
Max.
≤ +2 16
- 1
SERCOS/DPI Scaling Resolution
Structure of the scaling factor:
Bits 15-0: factor Units
N/A