Program features 31
Note:
When the master is ramping down to a stop, the follower observes the
decreasing reference but receives no stop command until the master stops
modulating and clears bit 3 of the follower control word. Because of this, the
maximum and minimum speed limits on the follower drive should not have the same
sign – otherwise the follower would be pushing against the limit until the master finally
stops.
Three words of additional data can optionally be read from each follower. The
followers from which data is read are selected by parameter
in the master. In each follower drive, the data to be sent is selected by
parameters
. The data is transferred in integer format over the link, and
displayed by parameters
…
in the master. The data can then be
forwarded to other parameters using
.
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
. The action to be taken
when a follower is faulted is selected by
. External events
(see parameter group
) can be used to indicate the status of other
bits of the status word.
Block diagrams of the master/follower communication are presented on pages
and
.
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*,
*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]).
Summary of Contents for ACS860
Page 1: ... ABB INDUSTRIAL DRIVES ACS860 primary control program Firmware manual ...
Page 4: ......
Page 10: ...10 Table of contents ...
Page 18: ...18 Using the control panel ...
Page 24: ...24 Control locations and operating modes ...
Page 54: ...54 Program features ...
Page 78: ...78 Program features ...
Page 90: ...90 Application macros ...
Page 342: ...342 Additional parameter data ...
Page 380: ...380 Fault tracing ...
Page 381: ...Fault tracing 381 ...
Page 382: ...382 Fault tracing ...
Page 436: ...436 Control chain diagrams ...