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Function Description
WAGO-I/O-SYSTEM 750
750-880, 750-880/025-000 ETHERNET Programmable Fieldbus Controller
Manual
Version 1.0.1
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7.3.3.1
Data Exchange between EtherNet/IP Master and I/O Modules
The data exchange between Ethernet/IP master and the I/O modules is
objectoriented. Each node on the network is depicted as a collection of objects.
The "assembly" object specifies the structure of the objects for the data
transmission. With the assembly object, data (e.g. I/O data) can be combined into
blocks (mapped) and sent via a single message connection. Thanks to this
mapping, less access to the network is necessary.
There is a distinction between input and output assemblies.
An input assembly reads in data from the application via the network or produces
data on the network.
An output assembly writes data to the application or consumes data from the
network.
In the fieldbus coupler/controller, various assembly instances are already
preprogrammed (static assembly).
After the input voltage is applied, the assembly object combines data from the
process image. As soon as a connection is established, the master can address the
data with "class", "instance", and "attribute" and access it or read and write using
I/O connections.
The mapping of the data depends on the assembly instance of the static assembly
selected.
Information
Additional Information:
The assembly instances for the static assembly are described in the section
"Ethernet/IP".
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