ABB ACS880 Firmware Manual page 35

Master/follower wiring with electrical cable
Master
Termination ON
See the hardware manual of the drive for wiring and termination details.
Ring configuration with fiber optic cables
Master
(ZCU) Control unit
FDCO
T R
T = Transmitter; R = Receiver
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Follower 1
Termination OFF
Follower 1
(BCU) Control unit
RDCO
CH2
T R
Program features 35
Follower n
Termination ON
Follower 2
(ZCU) Control unit
FDCO
T R