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SI-EtherCAT User Guide
Issue Number: 2
smallest time unit will be microseconds), see Table 7-40 for more information.
Table 7-40 Interpolation time period units
The time period is checked to ensure that it is an integer multiple of the control loop cycle time. Only
linear interpolation is currently supported, this type inserts a delay of one interpolation time period.
The input buffer has a maximum size of 1 data record, and a data record contains one position in
profile-defined units. The buffer is a FIFO buffer. On each interpolator time period, a value is read
from this buffer. The correct number of data points for a specific interpolation mode are stored
internally. When a new position command is loaded in, the oldest position command in the data set
is discarded.
7.5
vl velocity mode
Velocity mode is supported on Unidrive M200 and above. It is not, however, supported in regen
modes.
When the drive is in either of the RFC-A or RFC-S operating modes the scaled velocity is written to
the drive internal speed shortcut. When the drive is in an open-loop operating mode the scaled
velocity is written to the user preset reference parameter (Pr
01.021
). Table 7-41 lists the objects
that are supported:
Table 7-41 vl velocity mode supported objects
Value in 0x60C2, sub-index 2
Description
0
1 second
-1
0.1 of a second
-2
0.01 of a second
-3
0.001 of a second
-4
0.0001 of a second
-5
0.00001 of a second
-6
0.000001 of a second
Index
Name
0x3008
Active velocity mode redirection
0x6042
vl_target_velocity
0x6043
vl_velocity_demand
0x6044
vl_velocity_actual_value
0x6046
vl_velocity_min_max_amount
0x6048
vl_velocity_accleration
0x6049
vl_velocity_deceleration
0x604A
vl_velocity_quick_stop
0x604B
vl_setpoint_factor
0x604C
vl_dimension_factor
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