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
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
–
Chained multicast
Supported only for drive-to-drive reference
1 and control word
Summary of Contents for ACS850 series
Page 1: ...ACS850 Firmware Manual ACS850 Standard Control Program ...
Page 4: ......
Page 56: ...56 Control locations and operating modes ...
Page 262: ...262 Parameters ...
Page 310: ...310 Fault tracing ...
Page 348: ...348 Control through a fieldbus adapter ...
Page 358: ...358 Drive to drive link ...