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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
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
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
when a follower is faulted is selected by
(see parameter group
bits of the status word.
Block diagrams of the master/follower communication are presented on pages
and 593.
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
DDCS communication module; drives with a
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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62.28...62.36
in the master. The data can then be
60.17 Follower fault
31 Fault
functions) can be used to indicate the status of other
ZCU
control unit require an additional FDCO
60.14 M/F follower
Follower
SW. The action to be taken
action. External events
BCU
control unit require an RDCO
592
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- Fault and Warning Messages, Data Logging
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