Rockwell Automation 8720MC Drives Integration Manual - Manual (Page 128)

Publication 8720MC-IN002A-EN-P — December 2002
C-16 Programming Parameters
Name: Velocity_Polarity Data Display: Enumeration of Choices R/W
Parameter No.
43
File:
Control
Group:
Velocity Description: Velocity polarity parameter. This parameter is used to switch polarities of velocity data for specific
applications. Polarities are not switched internally but externally (on the input and output) of a closed loop system.
The motor shaft turns clockwise when there is a positive velocity command difference and no inversion is
programmed. SERCOS interface only.
Enumeration:
Structure of velocity polarity parameter:
Bit 0 – Velocity command value
0 = non-inverted
1 = inverted
Bit 1 – Additive velocity command value (SERCOS interface only)
0 = non-inverted
1 = inverted
Bit 2 – Velocity feedback value
0 = non-inverted
1 = inverted
Bits 15-3 (reserved)
This parameter is available with the 8720MC SERCOS interface.
Default:
x000 Length
2 bytes Minimum/Maximum
N/A Scaling Resolution
N/A Units
N/A
Name: Vel_Scale_Type Data Display: Bit Pattern R/W
Parameter No.
44
File:
Control
Group:
Velocity Description: SERCOS Velocity Data Scaling Type. A variety of scaling methods can be selected by means of the
scaling type parameter. Bit 5 is set to “minutes” for preferred data.
Enumeration:
Structure of velocity 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
0 = meters (m)
1 = inches (in)
Bit 4: Units for rotational scaling
0 = revolutions (R)
1 = (reserved)
Bit 5: Time units
0 – minutes (min)
1 – seconds (s)
Bit 6: Data reference
0 – at the motor shaft
1– at the load
(all other bits are reserved)
This parameter is available with the 8720MC SERCOS interface.
Default
x000x010: Length
2 bytes Minimum/Maximum
N/A Scaling Resolution
N/A Units
N/A