Network reference – Rockwell Automation 20G PowerFlex 750-Series AC Drives User Manual
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Rockwell Automation Publication 750-RM002B-EN-P - September 2013
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Motor Control
Chapter 4
Network Reference
Speed Reference A is the normal speed reference used. To choose a source for this
reference, make a selection in P545 [Spd Ref A Sel]. Also, when the network
(Logic Command Word) is used as the speed reference, refer to the following
documentation for details of operation:
•
PowerFlex 750-Series AC Drives Programming Manual,
•
PowerFlex 755 Drive Embedded EtherNet/IP Adapter User Manual,
•
PowerFlex 20-750-ENETR Dual-port EtherNet/IP Option Module User
Manual,
•
EtherNet/IP Network Configuration User Manual,
The Reference is a 32-bit REAL (floating point) piece of control data produced
by the controller and consumed by the adapter. The Feedback is a 32-bit REAL
(floating point) piece of status data produced by the adapter and consumed by
the controller.
When using a ControlLogix controller, the 32-bit REAL Reference is always
DINT 1 in the output image and the 32-bit REAL Feedback is always:
•
DINT 1 in the input image when using the drive Add-On Profile.
•
DINT 2 when using the Generic Profile.
For a PLC-5®, SLC™ 500 or MicroLogix™ 1100/1400 controller, the 32-bit REAL
Reference word is always words 2 (Least Significant Word) and 3 (Most
Significant Word) in the output image and the 32-bit REAL Feedback is always
words 2 (Least Significant Word) and 3 (Most Significant Word) in the input
image.
When using a drive Add-On Profile, the Reference and Feedback are
automatically formatted properly and displayed as a controller tag. When using
the Generic Profile, the I/O image is integer-based and the Reference and
Feedback are floating point. Because of this, a COP (Copy) instruction or User
Defined Data Type (UDDT) is required to correctly write values to the
Reference and read values from the Feedback. Refer to the PowerFlex 755
Embedded EtherNet/IP Adapter User Manual or to the PowerFlex 20-750-
ENETR Dual-port EtherNet/IP Option Module User Manual for ladder logic
program examples.
When using the drive Add-On Profile, the controller tags for Reference and
Feedback are automatically and properly formatted. This eliminates the need for
data conversion using COP (copy) instructions or a UDDT to copy the DINT
data into a REAL word.