Rockwell Automation 5730 DriveLogix5730 Controller for PowerFlex 700S Drives with Phase II Control - Manual (Page 26)

2-2 Placing and Configuring the Drive
and must be present. If the associated links are not present, or are deleted,
the communication connection between the controller and drive will be lost.
The user-defined tags are made up of a fixed number of REAL (floating
point) and DINT (double integer) data types. Links are not required within
the drive’s firmware to support these tags. Therefore, links may be created
and deleted as desired without having an affect on the communication
connection between the controller and the drive. The user-defined tags may
be used to address application specific data needs not covered by the
pre-defined tags.
Mapping for Inputs and Outputs
For each of the 21 inputs and 21 outputs, there is a dedicated parameter
within the drive, for a total of 42 parameters. Selecting a communication
format defines the data types for each input and output. It also determines
the data type for the dedicated parameter in the drive. The selection also
configures parameters 601 [From DL DataType] and 625 [To DL
DataType], which indicate the data types for each dedicated parameter
within the drive.
Determining When the
Controller Updates the Drive The DriveLogix controller follows a producer/consumer model for the drive
connection, similar to the interface to an I/O module. The drive acts as both
an input module, producing data for the controller; and an output module,
consuming data from the controller. Although the producer/consumer
model multi-casts data, all data in the drive connection is exclusive to the
DriveLogix controller.
The controller updates the input and output data in the drive connection
asynchronously to the logic scan, consistent with the way it handles other I/
O data. All input data from the drive is read in a single block and all output
data is written to the drive in a single block.
You must configure the Requested Packet Interval (RPI) rate for the drive.
This setting affects how fast the controller reads and writes the data in the
drive interface.
The Drive consumes data from the DriveLogix controller every 2
milliseconds, and produces data to the controller every 2 milliseconds. The
drive updates the inputs and outputs to the controller asynchronous to both
the program scan and I/O scan of the controller.
TIP: If you want data to remain constant throughout one scan, make a copy
of the data at the beginning of the scan and use the copy throughout the
scan.