Using the I/O 5-5
PowerFlex® 755 Drive Embedded EtherNet/IP Adapter User Manual
Publication 750COM-UM001A-EN-P
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
changed without using an Explicit Message. When enabled, each
Datalink occupies one 32-bit word in a ControlLogix controller or two
16-bit words in a PLC-5, SLC 500 or MicroLogix 1100 controller.
The following rules apply when using PowerFlex 750-Series drive
Datalinks:
• The target of a Datalink can be any Host parameter, including those
of a peripheral. For example, drive parameter 535 - [Accel Time 1]
can be assigned to the embedded adapter and any or all of the Option
Cards installed in the drive.
• The data passed through the drive’s Datalink mechanism is
determined by the settings of adapter Parameters 01-16 - [DL
From Net 01-16] and Parameters 17-32 - [DL To Net 01-16].
• When a Datalink I/O connection is active, that Datalink is 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 750-Series peripherals (embedded EtherNet/IP
adapter and option modules such as an encoder or 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 download or
anything else that could change the makeup of the I/O connection in a
running system. The I/O connection with the controller must first be
disabled to allow changes to the respective Datalinks.
Table 5.C Example Speed Reference/Feedback Scaling for PowerFlex 750-Series
Drives
Network
Reference Value
Speed Command
Value
Output Speed
Network
Feedback Value
130.0 130 Hz 60 Hz
(2)
(2)
The drive runs at 60 Hz instead of 130 Hz or 65 Hz because drive Parameter 520 - [Max
Fwd Speed] sets 60 Hz as the maximum speed.
60.0
65.0 65 Hz 60 Hz
(2)
60.0
32.5 32.5 Hz 32.5 Hz 32.5
0.0 0 Hz 0 Hz 0.0
-32.5
(1)
(1)
The effects of values less than 0.0 depend on whether the PowerFlex 755 drive uses a
bipolar or unipolar direction mode. Refer to the drive User Manual for details.
32.5 Hz 32.5 Hz 32.5
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