ProSoft Technology MVI71-DFNT - Manual (Page 77)

MVI71-DFNT ♦ PLC 5 Reference
EtherNet/IP Client/Server Communication Module User Manual
ProSoft Technology, Inc. Page 77 of 175
February 3, 2011
The DFNT module supports server functionality using the reserved ControlNet
service port 0xAF12. Services supported in the module permit client applications
(that is, RSView, ControlLogix processors and RSLinx) to read from and write to
the module’s database. This document discusses the requirements for attaching
to the module using several client applications.
The following illustration shows the relationship of the DFNT module’s
functionality to devices on an Ethernet network:
Server functionality places all data transfer operations outside the module. There
is no configuration required in the module other than setting up the network and
database parameters in the configuration file. Ladder logic in attached
processors use MSG instructions to perform read and write operations on the
module’s internal database.
When RSLinx links a user application to the module, the module’s server
functionality must be used. RSLinx exists on an Ethernet network only as a client
application. It cannot act as a server. User applications can use the DDE/OPC
capabilities built into RSLinx to interface with the data in the DFNT module.
RSView can link directly to the module using drivers supplied by RSLinx.