ABB Symphony Harmony Series, Instruction, Page: 184 / 402

Labels
WBPEEUI240751C0 6 - 5
2. Redundant I/O modules share the same device label. The primary I/O
module will define or update the backup I/O module’s device label automati-
cally. This occurs even if the backup I/O module does not currently have a
device label defined or if it has a device label that is different than the primary
I/O module’s.
The device label for an I/O block can be any unique, meaning-
ful label desired. Labels can be assigned using any labeling
scheme desired. The labels should include enough detail, how-
ever, to easily identify and differentiate between devices and
should be defined consistently from block to block.
The Harmony controller performs all device label manage-
ment, meaning that any changes, updates, and additions are
directed to the controller which then communicates the
changes, updates, and additions to the appropriate, individual
I/O blocks.
NOTE: For compatibility reasons, the label for a Harmony controller is derived
from its hardware address. This label cannot be modified.
Predefining a Device Label
Typically the device label is defined for an I/O block as the last
step of block installation or I/O module replacement as
described in
Section 5 and Section 10 respectively. This is not
a requirement however. In some cases, it may be easier and
less time consuming to have the label assigned before begin-
ning installation or replacement. Refer to procedure section
PR25 for the steps to predefine a device label.
Online Configuration
Specification one of FC 221 contains the device label. This
specification is not tunable, which means it normally cannot
be changed while the controller is operating in execute mode.
The specification can be changed, however, using online con-
figuration. If the device label is changed using online configu-
ration, then the controller will automatically change the
block's label to match this new label. Refer to the
Primary
Primary Primary
Primary
Interface
Interface Interface
Interface instruction for an explanation of online configura-
tion.