03.2010
Communication / CBC
Siemens AG
6SE7087-6QX70 (Version AL)
SIMOVERT MASTERDRIVES
Compendium Motion Control
8.4-3
In the process-data area (see Fig. 8.4-2), all the information is
transferred which is necessary for controlling a speed-controlled drive
in an integrated technical process. Control information (control words)
and setpoints are given to the converter by the CAN-bus master. In the
reverse direction, information on the status of the converter (status
words) and actual values are transferred.
The CBC communications board stores the received process data in
the dual-port RAM in the sequence in which they are transferred in the
telegram.
Control electronics CUPM, CUMC, CUVC
or TB technology board
CBC
CAN bus
CUPM: Control
Unit
Motion
Control
Performance
2
CUMC: Control
Unit
Motion
Control
CUVC: Control
Unit
Vector
Control
TB: Technology
Board
e.g.
T300,
T100
Dual-Port-RAM
Fig. 8.4-3
Coupling of the CBC to the converter via the dual-port RAM interface
An address is assigned to each word in the dual-port RAM. The
contents of the dual-port RAM in the converter (CU + if necessary the
TB) can be freely routed by means of parameters, e.g. the second word
in the process-data area of the telegram as a speed setpoint sent to the
ramp-function generator connected downstream. The same mechanism
applies to other setpoints and to each individual bit of the control word.
The procedure is also used in the reverse direction for transferring
actual values and the status words.
Besides supporting the normal exchange of process data, the CBC
communications board also supports broadcasting (same process data
for all drives on the bus), multicasting (same process data for a group
of drives on the bus) and cross traffic (data exchange between the
individual drives without participation of a CAN-bus master).
Diagnostic LEDs quickly provide the user with information on the
current status of the CBC. Detailed diagnostic information can be
directly read out of the diagnostics memory of the CBC by means of a
diagnostic parameter.
Controlling and
operating the
MASTERDRIVES
converters via the
CAN bus
