Reference MVI56-BDW
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ControlLogix Platform
BARDAC Drive Web Interface
ProSoft Technology, Inc.
Page 65 of 82
September 4, 2008
5.2.3 Data Flow Between the MVI56-BDW Module and the
ControlLogix Processor
The following topics describe the flow of data between the two pieces of
hardware (ControlLogix processor and MVI56-BDW module) and other nodes on
the network under the module's only mode. The module contains four
independent clients. Each client generates messages that are passed to
BARDAC-DW compatible drives for monitoring or control.
Client Driver
In the client driver, the MVI56-BDW module is responsible for issuing read (get)
or write (set) commands to servers on the network. These commands are user
configured in the module via the Client Command List received from the module's
configuration file (BARDACDW.CFG) or issued directly from the ControlLogix
processor (event command control). Command status is returned to the
processor for each individual command in the command list status block. The
location of this status block in the module's internal database is user defined. The
following flow chart and associated table describe the flow of data into and out of
the module.
Step Description
1
The client driver obtains configuration data from the BARDACDW.CFG file when the
module restarts. The configuration data obtained includes the timeout parameters and
the Command List. These values are used by the driver to determine the type of
commands to be issued to the other nodes on the network.
