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34 Program features
Three words of additional data can optionally be read from each follower. The
followers from which data is read are selected by parameter
in the master. In each follower drive, the data to be sent is selected by
…
. The data is transferred in integer format over the link, and
in the master. The data can then be
forwarded to other parameters using
…
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
. The action to be taken
when a follower is faulted is selected by
. External events
(see parameter group
) 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
and
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
control unit require an additional FDCO
DDCS communication module; drives with a
control unit require an RDCO
module.
*This connection cannot co-exist with, 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.
Summary of Contents for ACS880-x04
Page 1: ... ABB INDUSTRIAL DRIVES ACS880 primary control program Firmware manual ...
Page 4: ......
Page 18: ...18 Using the control panel ...
Page 24: ...24 Control locations and operating modes ...
Page 112: ...112 Application macros ...
Page 496: ...496 Additional parameter data ...
Page 544: ...544 Fault tracing ...
Page 602: ...602 Control chain diagrams ...