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 60.14 M/F follower
selection in the master. In each follower drive, the data to be sent is selected by
parameters 61.01…61.03. The data is transferred in integer format over the link, and
displayed by parameters 62.28…62.36 in the master. The data can then be
forwarded to other parameters using 62.04…62.12.
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 600
and 601.
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 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.
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