5-4
Using the I/O
PowerFlex 750-Series Drive DeviceNet Option Module User Manual
Publication 750COM-UM002A-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.
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 any or all Option Modules installed in the drive.
•
The data passed through the Datalink mechanism is determined by
the settings of:
Important: A reset is always required after configuring Datalinks so
that the changes take effect.
•
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.
Depending on the controller being used, the I/O connection can be
disabled by:
•
Inhibiting the module in RSLogix 5000
•
Putting the controller in Program mode
•
Placing the scanner in idle mode
•
Disconnecting the drive from the network
DeviceLogix Datalinks are also locked while the DeviceLogix program
is running. The DeviceLogix program must first be disabled to allow
changes to the Datalinks. Set DeviceLogix parameter 53 - [DLX
Operation] to “DisableLogic” to disable the logic (the parameter value
will then change to “LogicDisabld.”
Device Parameter 02 - [DLs From Net Cfg] Host Parameters 01-16 - [DL From Net 01-16]
Device Parameter 04 - [DLs To Net Cfg]
Host Parameters 17-32 - [DL To Net 01-16]
Summary of Contents for PowerFlex 750-Series
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