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The MVI94-MBM communication module is used for the interface between Modbus slave devices and FlexI/0 systems. This module contains a
A user-defined virtual Modbus database. This database is used to send messages from the Modbus main port to
Modbus requests and command messages from devices. The data regions in the virtual Modbus database can be reserved for
The status and error messages generated by modules under user control.
The virtual Modbus database also uses the FlexVO bus (backplane) to interface with the Flex1/0 system. send
With this backplane interface, any processor on the PLC or ControlNet network can use data
. The input and output image table in the module is used to present data from the virtual Modbus database to the back
Board.
There is a Modbus master port on the communication module for continuous polling of Modbus slave devices. most
100 user-defined commands can be defined for the port. The data read from the device via Modbus is placed
Placed in the virtual Modbus database. Any write request from the Modbus slave device comes from the virtual
The data in the Modbus database.
This module can be configured to prioritize non responsive slave devices at a lower level. If the module confirms the slave settings
If the backup fails to respond to the message after a user-defined number of retries, it will be marked as “communication failure” from the device, and
Set the error delay counter to the user specified value. Whenever the module encounters this from the service in the command list
When using the timer, the counter will decrease. When the value is zero, the slave server will be active. This facility can
Improve communication throughput on Modbus networks.
Instructions can be activated within the module under the control of the processor. This feature allows the processor to program control
Issue commands from the command list. When a command is activated, it will be placed in the command queue
Column for immediate execution. Normal command polling will start after the command queue completes processing.
In addition, the processor can directly send commands to any slave device connected to the Modbus main port.
This feature can be used for commands that are issued irregularly and are not in the command list. Command submitted as an event
Will be placed in the command queue for immediate execution. They will preempt the normal operation of the voting list. When
When the command queue is completely empty, normal command polling will resume.
This module provides a configuration/debugging port for external computers to execute terminal simulation programs. This module
The provided terminal simulation program allows for the upload and download of configuration information required for this module. In addition,
The Configuration/Debug port provides access to view virtual Modbus databases, communication statistics, and configurations
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