ABB ACS880 Firmware Manual page 78

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