User manual

Configuration 3-10

DeviceNet I/O Configuration

I/O Mapping

The DeviceNet I/O configuration defines the format of the Input and Output tables

in the PassageWay, or the mapping of DeviceNet slaves’ I/O data to the I/O tables.

See “Theory of Operation” on page 1-2 for a discussion on the PassageWay and

the use of I/O tables in the BridgeWay. As slaves are added to the BridgeWay’s

DeviceNet scanner configuration, the location in the I/O tables of each part of the

slave’s I/O data is determined and stored.

Note: The organization of the I/O tables is very important. This defines the format

of the data that will be exposed to the EtherNet/IP scanner. The Input and Output

table formats should be planned and documented to ensure the EtherNet/IP scan-

ner is working with the correct data from the DeviceNet network.

I/O Size Limitations

The size of the I/O data that can be exchanged with the EtherNet/IP scanner and,

hence, the size of the I/O tables is restricted as explained below.

• The Input table size cannot be larger than 500 bytes.

• The Output table size cannot be larger than 500 bytes.

• Either table may be empty (size of 0 bytes).

DeviceNet Configuration Tools

The DeviceNet I/O configuration is set using a DeviceNet configuration tool. This

manual is not intended to replace the user manual for the configuration tool, so

will not provide details on using the tool.

The next chapter provides an example application, and covers the use of Rockwell

Software’s RSNetWorx for DeviceNet and HMS’ NetTool-DN.