Ddcs Communication; General; Topology; Communication - ABB ACS880 Firmware Manual

DDCS communication

General


The DC/DC converter can be connected to an external controller that supports the ABB
DDCS communication (such as the ABB AC 800M) using fiber optic cables. BCU control
unit requires an RDCO module.

Topology


An example connection with a BCU-based converter is shown below. Ring and star
configurations are also possible, and the external controller connects to channel CH0 on
the RDCO module.
Controller
T R
T = Transmitter; R = Receiver

Communication


The communication between the controller and the converter consists of data sets of three
16-bit words each. The controller sends a data set to the converter, which returns the next
data set to the controller.
The communication uses data sets 10...33. Data sets with even numbers are sent by the
controller to the converter, while data sets with odd numbers are sent by the converter to
the controller. The contents of the data sets are freely configurable, but data set 10
typically contains the control word and one or two references, while data set 11 returns the
status word and selected actual values.
The word that is defined as the control word is internally connected to the drive logic; the
coding of the bits is as presented in section
195). Likewise, the coding of the status word is as shown in section
fieldbus Status word
By default, data sets 32 and 33 are dedicated for the mailbox service. By parameter
(160.64), data sets 24 and 25 can be selected instead of data sets 32 and 33.
For the DC/DC converter modules, the system integrator can acquire the necessary
cables and adapters for the physical link of the DDCS communication from ABB and install
and set up the link on his/her own. Consult ABB for more information.

Settings and diagnostics


Parameters: parameter groups
DDCS receive
Warnings: AE6D DDCS controller comm loss
Faults: 7E11 DDCS controller comm loss
(page 196).
160 DDCS
ACS880
BCU control unit
CH0
T
Contents of the fieldbus Control word
communication, 161 DDCS
Program features 43
RDCO
R
(page
Contents of the
transmit, 162