ABB ACS850 series, Руководство пользователя

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Drive-to-drive link 351
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.
„
Master point-to-point messaging
In this type of messaging, the master sends one dataset (LocalDsNr) from its own
dataset table to the follower’s. TargetNode stands for the node address of the
follower; RemoteDsNr specifies the target dataset number.
The follower responds by returning the contents of the next dataset. The response is
stored into dataset Lo1 in 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
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Chained multicast
Supported only for drive-to-drive reference
1 and control word