ABB ACS880-01 Series, Firmware Instructions

Page: 71 / 664

Program features 71
To indicate faults in the followers, each follower must be configured to transmit its
status word as one of the above-mentioned data words. In the master, the
corresponding target parameter must be set to
Follower SW . The action to be taken
when a follower is faulted is selected by 60.17 Follower fault action . External events
(see parameter group 31 Fault functions ) can be used to indicate the status of other
bits of the status word.
Block diagrams of the master/follower communication are presented on pages 660
and 661 .
Construction of the master/follower link
The master/follower link is formed by connecting the drives together using either
• shielded twisted-pair cable between the XD2D terminals of the drives*, or
• fiber optic cables. Drives with a
ZCU control unit require an additional FDCO
DDCS communication module; drives with a BCU control unit require an RDCO
module.
*This connection cannot co-exist, and is not to be confused with, drive-to-drive (D2D)
communication implemented by application programming (detailed in
Drive application
programming manual (IEC 61131-3) , 3AUA0000127808 [English]).
Connection examples are shown below. Note that a star configuration using fiber
optic cables requires an NDBU-95C DDCS branching unit.
Master/follower wiring with electrical cable
Master
Termination ON
1 2 3 4 1 2 3 4 1 2 3 4
XD
2D
B XD
2D
XD
2D
A
BG
N
D
S
hie
ld
B A
BG
N
D
S
hie
ld
B A
BG
N
D
S
hie
ld
Follower 1
Termination OFF Follower n
Termination ON
See the hardware manual of the drive for wiring and termination details.