ABB ACS850 series, Manual

Page: 350 / 370

350 Drive-to-drive link
Datasets
Drive-to-drive communication uses DDCS (Distributed Drives Communication
System) messages and dataset tables for data transfer. Each drive has a dataset
table of 256 datasets, numbered 0…255. Each dataset contains 48 data bits.
By default, datasets 0…15 and 200…255 are reserved for the drive firmware;
datasets 16…199 are available for the user application program.
The contents of the two firmware communication datasets can be configured freely
with pointer parameters and/or application programming with the DriveSPC tool. The
16-bit control word and 32-bit drive-to-drive reference 1 are transmitted from one
dataset on a 500-microsecond (by default) time level; drive-to-drive reference 2 (32
bits) is transmitted from the other dataset on a 2-millisecond (by default) time level.
The followers can be configured to use the drive-to-drive commands and references
with the following parameters:
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 separate document
Application guide:
Application programming for ACS850 drives (3AUA0000078664 [English]).
Control data Parameter
Setting for drive-to-drive
communication
Start/Stop commands
10.01 Ext1 start func
10.04 Ext2 start func
D2D
Torque limits
20.09 Maximum torque2
20.10 Minimum torque2
D2D ref1 or D2D ref2
Speed reference
21.01 Speed ref1 sel
21.02 Speed ref2 sel
23.08 Speed additive
D2D ref1 or D2D ref2
Torque reference
24.01 Torq ref1 sel
24.02 Torq ref add sel
D2D ref1 or D2D ref2
PID setpoint and feedback
27.01 PID setpoint sel
27.03 PID fbk1 src
27.04 PID fbk2 src
D2D ref1 or D2D ref2
Mechanical brake open
torque
42.09 Open torq src D2D ref1 or D2D ref2