Rockwell Automation 25B PowerFlex 525 Embedded EtherNet/IP Adapter - Manual (Page 63)

Rockwell Automation Publication 520COM-UM001B-EN-E - March 2013 63
Using the I/O Chapter 5
Using Reference/Feedback The Reference is a 16-bit word that is produced by the controller and consumed
by the adapter. The Feedback is a 16-bit word produced by the adapter and
consumed by the controller.
When using a ControlLogix or CompactLogix controller, the Reference is always
INT 1 in the output image (see
I/O Image for PowerFlex 525 Drives on page 62 )
and the 16-bit Feedback is always:
• INT 1 in the input image when using the drive Add-On Profile.
• INT 3 when using the Generic Profile.
The Reference and Feedback are 16-bit values which represent drive speed in
0.01 Hz.
Using Datalinks A Datalink is a mechanism used by PowerFlex drives to transfer data to and from
the controller. Datalinks allow a drive parameter value to be read or written to
without using an Explicit Message. When enabled, each Datalink occupies one
16-bit word in a ControlLogix, CompactLogix, or MicroLogix controller.
The following rules apply when using PowerFlex 525 drive Datalinks:
• Datalinks cannot be used with Multi-drive mode.
• The target of a Datalink can be any valid parameter, including those of a
peripheral. For example, drive parameter P041 [Accel Time 1] can be the
target of the embedded EtherNet/IP adapter and any or all Option Cards
installed in the drive.
• The data passed through the drive’s Datalink mechanism is determined by
the settings of parameters C157...C160 [EN Data Out 1...4] and
parameters C153...C156 [EN Data In 1...4].
• When an I/O connection that includes Datalinks is active, those Datalinks
being used are locked and cannot be changed until that I/O connection
becomes idle or inactive.
• When you use a Datalink to change a value, the value is NOT written to
the Non-Volatile Storage (NVS). The value is stored in volatile memory
and lost when the drive loses power. Thus, use Datalinks when you need to
change a value of a parameter frequently.
Datalinks for PowerFlex 525 drive peripherals (embedded EtherNet/IP adapter
and Option Modules such as a communication module) are locked when the
peripheral has an I/O connection with a controller. When a controller has an I/O
connection to the drive, the drive does not allow a reset to defaults, configuration
IMPORTANT There are several parameters in the drive that will override the start source and
speed reference command if enabled. For details on these parameters, see the
PowerFlex 525 drive’s user manual, publication
520-UM001 .
Attempting to write a negative value to the Speed Reference will result in the
drive ramping to maximum speed due to overflow, the direction of the drive
can only be controlled programmatically with the appropriate bits (bits 4 and
5) in the Command Word.