ABB Symphony Harmony Series, Instruction, Page: 181 / 402

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Harmony Controller
The complete control configuration resides and is retained in
the Harmony controller at all times. The controller only off
loads a portion of the configuration to be executed by the I/O
blocks.
The controller automatically downloads the configuration dur-
ing startup or after any configuration changes. For this to
automatically occur, however, a device label must already have
been established in each I/O block. Also, the device label in
the block must match a device label in the control configura-
tion of the Harmony controller (i.e., I/O device definition func-
tion code).
Verification
The Harmony controller is responsible for verifying I/O block
configuration. After losing then regaining communication with
an I/O block, the controller will issue commands to read, com-
pare, then download if necessary the configuration. A down-
load will occur if the controller detects any of the following
conditions:
•
Excluded function code.
•
Extra function code.
•
Difference in Harmony controller and I/O block
specifications.
Changes
All control configuration changes made by the process engi-
neer, technician, or operator affect the control configuration
that resides in the Harmony controller. The changes can
include adding new or deleting existing function codes, and
modifying and tuning specifications of existing function codes.
When a change is made to the control configuration that
affects I/O blocks, the controller automatically downloads the
changes to the appropriate blocks.
For a nonredundant controller, all changes except tuning
require the controller to be placed in configure mode. The
controller and I/O blocks do not execute the control configura-
tion while in configure mode. For redundant controllers, online
configuration enables making configuration changes without
affecting the primary controller or interrupting the control