ProSoft Technology MVI69L-MBS - Manual (Page 74)

MVI69L-MBS Backplane Data Exchange MVI69L-MBS ♦ CompactLogix Platform
User Manual Communication Module
Page 74 of 154 ProSoft Technology, Inc.
January 6, 2014
4.4.2 Master Mode
In Master mode, the MVI69L-MBS module issues read or write commands to
slave devices on the Modbus network. These commands are user-configured in
ProSoft Configuration Builder as the Port 1 Master Command List. This list is
transferred to the module when the module receives its configuration from the
processor.
The commands can also be issued directly from the CompactLogix processor
(Special Command Blocks).
Command status is returned to the processor for each individual command in the
command list. The location of this command status list in the module’s internal
database is user-defined. The following flow chart and associated table describe
the flow of command data into and out of the module.