Module Configuration Attributes
Rockwell Automation Publication MOTION-RM003I-EN-P - February 2018 475
PWM Frequency
Usage Access T Data Type Default Min Max Semantics of Values
Optional - D Set
UINT[8] [] = 0 [] = 0 [] = 2
16
Hertz
[ Axis 1 PWM Freq,
Axis 2 PWM Freq,
Axis 3 PWM Freq,
Axis 4 PWM Freq,
Axis 5 PWM Freq,
Axis 6 PWM Freq,
Axis 7 PWM Freq,
Axis 8 PWM Freq ]
This 8-element array sets the carrier frequency for the Pulse Width Modulation
output to the motor. Drive derating is required at higher PWM frequencies due to
switching losses. Current loop update time is tied directly to the PWM frequency
so loop performance generally increases with increasing PWM rate. Note that each
drive instance in a multi-axis drive module can have an independently configured
PWM frequency. The indexed elements of this array correspond to axis instances
1 thru 8. Individual elements of this attribute are only applicable to axis instances
whose associated Inverter Support bit is set. Array elements that are not applicable
or not configured are set to 0.
Bus Configuration
Usage Access T Data Type Default Min Max Semantics of Values
Optional - BD Set
USINT 0 - - Enumeration:
0 = Standalone
1 = Shared AC/DC
2 = Shared DC
3 = Shared DC - Non CIP
Converter
4 = Shared DC/DC
5 - 255 = Reserved
This enumerated selection specifies how the DC Bus is going to be used.
• "Standalone" specifies that DC Bus power supplied by the drive's converter
section is applied only to this drive’s power structure.
• "Shared AC/DC" specifies that the converter associated with this CIP
Motion device is to supply and share DC Bus power with other drives. This
would typically result in de-rating of the continuous current rating for the
Shared AC/DC drive.
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