ibaBM-DDCS
Manual
Issue 1.11
25
8.4
Parameter channel
8.4.1
Parameter
ibaBM-DDCS can access the service channel (CH3) of the ABB drives and query
parameters there, independent from a communication connection to a controller. ibaBM-
DDCS acts here as master and reads the current parameter values of the drives.
ibaBM-DDCS is directly connected to the CH3 port of a drive or to the master port of the
NDBU-95, which is connected to the drives (CH3).
Important note
The parameter channel is only for acquiring supplementary information from drives or
slow values, e.g. temperatures.
This is why we usually recommend for continuous acquisition the access via the
data set-channel.
Important note
Since every parameter is requested via handshake (request – response) by the drive, the
access cycle depends directly on the number of values, which are requested. A standard
value is: approx. 2 ms per analog value and approx. 2 ms per 16 digital values.
Access times become very high, when many drives are connected. In order to improve
this behavior, iba recommends using several ibaBM-DDCS devices, see the tip in chap.
The desired parameters are selected with ibaPDA as follows:
Node number (drive)
Parameter group
Parameter number
Figure 9:
Parameter selection
Like in DriveWindow, the parameters can be selected with a symbolic browser, where
the user can see the node names, the parameter groups and the parameters as text.
If DriveWindow and ibaPDA shall be operated in parallel, DriveWindow is connected to
the X34 (RX/TX) port of ibaBM-DDCS. The accesses to the drives are looped through
ibaBM-DDCS. In contrast to DriveWindow, ibaPDA can only read the parameters.
