ProSoft Technology MVI69-DFNT - Manual (Page 99)

MVI69-DFNT ♦ CompactLogix or MicroLogix Platform Reference
EtherNet/IP Client/Server Communication Module User Manual
ProSoft Technology, Inc. Page 99 of 167
May 14, 2014
5.2.4 Data Flow between MVI69-DFNT Module and CompactLogix or
MicroLogix Processor
The following discussion outlines the flow of data between the two pieces of
hardware (CompactLogix or MicroLogix processor and MVI69-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.
Server Driver
The Server Driver allows the MVI69-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.
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.