ABB Symphony Harmony Series Instruction page 56

WBPEEUI240767B0
A module mounting unit is required to mount and provide
power to rack-mounted modules. The unit is for mounting
controllers, I/O modules, and communication interface mod-
ules. The MMU backplane connects and routes:
Controlway.
•
I/O expander bus.
•
Logic power to control, I/O, and interface modules.
•
The Controlway and I/O expander bus are internal cabinet,
communication buses. Communication between rack control-
lers and communication interface modules is over Controlway.
Mounting Hardware
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