Reference MVI56E-MNETC/MNETCXT ♦ ControlLogix Platform
User Manual Modbus TCP/IP Client Enhanced Communication Module - Client/Server
Page 132 of 172 ProSoft Technology, Inc.
September 20, 2018
Client Driver
In the Client driver, the MVI56E-MNETC/MNETCXT module issues read or write
commands to servers on the Modbus TCP/IP network using up to 30 simulated
Clients. The commands originate either from the module's user-configured Client
x Command List for each Client, or directly from the processor as Event
Commands. The commands from the Client x Command List are executed either
via routine polling or as a result of special Command Control block requests from
the processor. Client status data is returned to the processor in special Client
Status blocks. The following flowchart describes the flow of data into and out of
the module.
1 The Client driver obtains configuration data when the module restarts. This
includes the timeout parameters and the Command List. These values are
used by the driver to determine the types of commands to be issued to
servers on the Modbus TCP/IP network.
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