Rockwell Automation 8720MC Drives Integration Manual - Manual (Page 134)

Publication 8720MC-IN002A-EN-P — December 2002
C-22 Programming Parameters
Name: Posn_Scale_Expon Data Display: Signed Integer R/W
Parameter No.
78
File:
Control
Group:
Position Description: Linear position data scaling exponent. This parameter defines the scaling exponent for all linear
position data in a SERCOS configured drive. Parameter 78 applies to the SERCOS and 32 bit SCANport (DPI)
configurations when preferred scaling is not used. Parameter 79, not 78, is used for analog configurations.
This parameter is available with the 8720MC SERCOS interface.
Default:
Preferred
10
-4
degree
10
-6
inch
Length
2 bytes Minimum/Maximum
Min. ≥ -2 15
Max. +2
15
- 1
Scaling Resolution
Structure of the scaling exponent:
Bit 15: Sign of the exponent
0 – positive
1 – negative
Bits 14–0: Exponent Units
N/A
Name: Rot_Posn_Resolut Data Display: Integer R/W
Parameter No.
79
File:
Control
Group:
Position Description: Rotational position resolution. This parameter defines the rotational position resolution for all position
data in a drive when rotational scaling and parameter scaling are selected in parameter 76. With the analog
configuration the default scaling is rotational and parameter scaling therefore parameter 79 is required to
determine the position resolution for orient. Parameter 79 is entered as an integer value representing the number
of position counts per revolution of the motor.
Default:
3600 counts or
.1 deg Length
2 bytes Minimum/Maximum
Min.
≥ 1
Max. ≤ +65535
Scaling Resolution
1 = 1 drive feedback count
360/parameter 79 = rotary position increment in deg. Units
counts/rev.
Name: Torque_Command Data Display: Decimal R/W
Parameter No.
80
File:
Control
Group:
Torque Description: Torque command value. In the SERCOS configuration, during the torque control operation mode of
the drive, torque command values are transferred from the control unit to the drive via parameter 80.
Default:
0.0 Length
2 bytes SCANport Min/Max
Min.
≥ -1000.0
Max. ≤ +1000.0
SCANport Scaling Resolution
1=.1% Units
%
Default:
0 Length
2 bytes SERCOS/DPI Min/Max
Min.
≥ -2 15
Max. ≤ +2 15
- 1
SERCOS/DPI Scaling Resolution
Scaling type: parameter 86
Scaling factor: parameter 93
Scaling exponent: parameter 94 Units
parameter
86