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Function Description
WAGO-I/O-SYSTEM 750
750-306 DeviceNet
TM
Fieldbus Coupler
Manual
Version 2.0.0
7.3
Data Exchange
Objects are used for exchange of process data for the DeviceNet
TM
fieldbus
coupler.
For access from the network to the individual objects, connections between the
required subscribes must first be established and connection objects set up or
activated.
For a quick and easy connection, the DeviceNet
TM
750-306 fieldbus coupler uses
the “Predefined Master/Slave Connection Set” in which 4 connections are already
predefined. Access to the fieldbus coupler is then possible by simply activating
(allocating) the connections.
The “Predefined Master/Slave Connection Set” is limited to only master/slave
relationships. Slaves only addressed via its assigned client like the DeviceNet
TM
750-306 fieldbus coupler are called “Group 2 Only Servers”. They can only be
addressed via the “Group 2 Only Unconnected Explicit Message Port” and only
receive messages defined in message group 2.
The “Assembly Object” specifies the structure of the objects for data
transmission. With the “Assembly Object”, I/O data can be combined into blocks,
for example, and sent via a single message connection. Creating blocks requires
less traffic on the network.
There is a distinction between input and output assemblies. An input assembly
reads in data from the application via network or produces data on the network.
An output assembly writes data to the application or pulls data from the network.
In the fieldbus coupler, various assembly instances are pre-programmed (static
assembly).
Additional Information
The assembly instances for static assembly are described in the section “Fieldbus
Communication” > … > “Process Data and Diagnostic Status” > “Assembly
Instances.”
