ABB ACS880 Series Firmware Manual page 37

Ring configuration with fiber optic cables
Master
(ZCU) Control unit
FDCO
T R
T = Transmitter; R = Receiver
Star configuration with fiber optic cables (1)
Master
(ZCU) Control unit
FDCO
T R
T = Transmitter
R = Receiver
Follower 1
(BCU) Control unit
RDCO
CH2
T R
Follower 1
(ZCU) Control unit
FDCO
T R
R T R T R T R T
MSTR CH0 CH1 CH2
NDBU
Program features 37
Follower 2
(ZCU) Control unit
FDCO
T R
Follower 2
(BCU) Control unit
RDCO
CH2
T R
Follower 3
(ZCU) Control unit