Prosoft-technology MVI56E-MNETCR Bedienungsanleitung PDF herunterladen (Seite 112)

Reference MVI56E-MNETCR ♦ ControlLogix Platform

User Manual Modbus TCP/IP Multi Client Enhanced Communications Module for Remote Chassis

Page 112 of 159 ProSoft Technology, Inc.

June 14, 2011

5.3.1 Client Driver

In the client driver, the MVI56E-MNETCR module issues read or write commands

to servers on the Modbus TCP/IP network using 30 simulated clients. These

commands are user configured in the module via the Client Command List for

each client received from the module's configuration file (MNET.CFG) or issued

directly from the 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 MNET.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 Modbus TCP/IP network.

2 When configured, the client driver begins transmitting read and/or write commands to the

other nodes on the network. If writing data to another node, the data for the write

command is obtained from the module's internal database to build the command.

3 Presuming successful processing by the node specified in the command, a response

message is received into the client driver for processing.

4 Data received from the node on the network is passed into the module's internal

database, assuming a read command.

5 Status data is returned to the processor for the client and a Command List error table

can be established in the module's internal database.

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Prosoft-technology MVI56E-MNETCR Bedienungsanleitung Seite 112