Appendix B – Drive-to-drive link
433
The communication status of the followers can be supervised by a periodic
supervision message from the master to the individual followers (see parameters
57.04 FOLLOWER MASK 1 and 57.05 FOLLOWER MASK 2).
Drive-to-drive function blocks can be used in the DriveSPC tool to enable additional
communication methods (such as follower-to-follower messaging) and to modify the
use of datasets between the drives. See the function blocks under Communication
(page 344).
Types of messaging
Each drive on the link has a unique node address allowing point-to-point
communication between two drives. The node address 0 is automatically assigned
to the master drive; on other drives, the node address is defined by parameter 57.03
NODE ADDRESS.
Multicast addressing is supported, allowing the composition of groups of drives. Data
sent to a multicast address is received by all drives that have that address. A
multicast group can consist of 1…62 drives.
In broadcast messaging, data can be sent to all drives (actually, all followers) on the
link.
Both master-to-follower(s) and follower-to-follower(s) communication is supported. A
follower can send one message to another follower (or a group of followers) after
receiving a token message from the master.
Type of messaging Note
Point-to-point Master point-to-point Supported only at master
Read remote Supported only at master
Follower point-to-point Supported only at followers
Standard multicast For both master and followers
Broadcast For both master and followers
Token message for follower-to-follower communication –
Chained multicast Supported only for drive-to-drive reference 1
and control word
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