Prosoft-technology MVI71-DFNT Bedienungsanleitung PDF herunterladen (Seite 76)

Reference MVI71-DFNT ♦ PLC 5

User Manual EtherNet/IP Client/Server Communication Module

Page 76 of 175 ProSoft Technology, Inc.

February 3, 2011

5.2.4 Data Flow between MVI71-DFNT Module and PLC Processor

The following discussion outlines the flow of data between the two pieces of

hardware (PLC processor and MVI71-DFNT module) and other nodes on the

TCP/IP network under the module’s different operating modes. The module

contains both servers and a Client.

The following topics discuss the operation of the server and Client drivers.

The Server Driver allows the MVI71-DFNT module to respond to data read and

write commands issued by clients on the Ethernet/IP network using explicit

messaging. The following flow chart and associated table describe the flow of

data into and out of the module.

Server Driver

Step Description

1 The server driver receives the configuration information from the configuration file on the

Compact Flash Disk, and the module initializes the servers.

2 A Host device, such as a ControlLogix processor, RSLinx or an HMI application issues a

read or write command to the module. The server driver qualifies the message before

accepting it into the module.

3 After the module accepts the command, the data is immediately transferred to or from

the internal database in the module. If the command is a read command, the data is read

out of the database and a response message is built. If the command is a write

command, the data is written directly into the database and a response message is built.

4 After the data processing has been completed in Step 3, the response is issued to the

originating master node.

5 Status data for the servers is passed to the processor under ladder logic control using

the command control data area in the M1 file.

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Prosoft-technology MVI71-DFNT Bedienungsanleitung Seite 76