Rockwell Automation RECOMM-ENET EtherNet/IP Communications Module - Manual (Page 65)

Using I/O Messaging 6-7
6.5 Using Datalinks
A Datalink is a mechanism used by Reliance Electric drives to
transfer data to and from the controller. Datalinks allow a parameter
value to be changed without using an Explicit Message. When
enabled, each Datalink consumes either two 16-bit or 32-bit words
in both the input and output image depending on its size. The size
of Datalinks (16-bit words or 32-bit words) is determined by the
drive and displayed in Datalink Size (19) in the module.
Rules for Using Datalinks
• Each set of Datalink parameters in a Reliance Electric drive can
be used by only one module. If more than one module is
connected to a single drive, multiple modules must not try to use
the same Datalink.
• Parameter settings in the drive determine the data passed
through the Datalink mechanism. Refer to the documentation for
your drive.
• 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.