Rockwell Automation 8720MC Drives Integration Manual - Manual (Page 152)

Publication 8720MC-IN002A-EN-P — December 2002
C-40 Programming Parameters
Name: Accel_Exponent Data Display: Integer R/W
Parameter No.
162
File:
Control
Group:
Acceleration Description: Acceleration data scaling exponent. This parameter defines the scaling exponent for all acceleration
data in a drive.
Default:
preferred 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
scaler
Name: Abs_Distance_1 Data Display: Decimal R/W
Parameter No.
177
File:
Motor/Drive/
Fdbk
Group:
Motor Feedback Description: Absolute distance 1. This parameter describes the distance between the machine zero point and the
zero point of an absolute feedback system on the motor. This parameter is used with the SERCOS interface.
Default:
0 Length
4 bytes SERCOS Min/Max
Min. ≥ -2 31
Max.
≤ +2 31
- 1
SERCOS Scaling Resolution
Scaling type: parameter 76
Scaling factor: parameter 77
Scaling exponent: parameter 78
Rotational position resolution: parameter 79 Units
parameter
76
Name: Posn_Foll_Error Data Display: Integer R,Link
Parameter No.
189
File:
Control
Group:
Position Description: Following distance. The drive uses the operation data of this parameter to store the distance
between position command value and the appropriate position feedback value 1/2. Calculation of the following
distance: following distance = position command value – position feedback value 1/2
Default:
0.00 Length
2 bytes SCANport Minimum/
Maximum
Min.
≥ -32768
Max.
≤ +32767
SCANport Scaling Resolution
1 = 1 count as determined by parameter 79,
with paramter 79 set at 3600 cnts/rev, 1 increment
= .1 degree, Range = -3276.8 to +3276.7 degrees Units
param 79
counts
Default:
0 Length
4 bytes SERCOS/DPI Min/Max
Min.
≥ -2 31
Max.
≤ +2 31
- 1
SERCOS/DPI Scaling Resolution
Scaling type: parameter 76
Scaling factor: parameter 77
Scaling exponent: parameter 78
Rotational position resolution: parameter 79 Units
parameter
76