ABB Symphony Harmony Series - Error Messages and Corrective Actions

Harmony Controllers
WBPEEUI240751C0 1 - 7
The controller can read and send I/O block channel data, con-
figuration information, and status over Hnet (Fig. 1-4). The
controller can also simultaneously communicate with rack I/O
devices over the I/O expander bus.
Harmony Area Controller
Like the bridge controller, the Harmony area controller (HAC)
supports the communications protocol and configuration envi-
ronment necessary to operate the Harmony I/O system. It col-
lects process I/O data, performs control algorithms, and
outputs control signals to final control elements through either
or both Harmony I/O blocks and rack I/O devices (Fig. 1-4).
The controller offers enhanced communications and process
interface abilities. Refer to the Harmony Area Controller
Harmony Area ControllerHarmony Area Controller
Harmony Area Controller
instruction for a detailed description.
Figure 1-4. Controller I/O Communication
RACK
I/O M O DUL E
TERMINATIO N
UNIT
T00552B
I/O
BLOCK
I/O H N ET
I/O E X PA N D ER B US
HARMONY
CONTROLLER