ABB Symphony Harmony Series, Instruction, Page: 98 / 402

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 Controller Harmony Area Controller Harmony Area Controller
instruction for a detailed description.
Figure 1-4. Controller I/O Communication
R AC K
I/O M O D U LE
T E R M IN AT IO N
U N IT
T 00 5 52 B
I/O
B LO C K
I/O H N E T
I/O E X PA N D E R BU S
H A R M O N Y
C O N T R O LL E R