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Rockwell Automation Publication 1788-UM059B-EN-P - September 2015 51
Configure the Linking Device Chapter 4
Configure DeviceNet I/O
I/O Mapping
The DeviceNet I/O configuration defines the format of the Input and Output
tables, or the mapping of DeviceNet slaves’ I/O data to the I/O tables. As slaves
are added to the linking device’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.
To configure standard DeviceNet I/O, use RSNetWorx for DeviceNet software
to set the linking device’s scan list and I/O table mapping.
1.
In RSNetWorx for DeviceNet software, from the Network menu, choose
Online.
2.
From the Network menu, choose Single Pass Browse.
Wait for browsing to complete.
3.
From the Network menu, choose Upload from Network.
Wait for the device information to be uploaded from the network.
IMPORTANT
Steps 8 and 9 are required only if the linking device is used as an I/O scanner.
The linking device can function as a gateway/bridge for explicit messaging and
safety I/O routing, even if no I/O is configured.
IMPORTANT
The organization of the I/O tables is very important. I/O tables define the
format of the data that is provided to the EtherNet/IP scanner. Plan and
document the Input and Output table formats to be sure the EtherNet/IP
scanner is working with the correct data from the DeviceNet network.
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 follows:
• The Input table size cannot be larger than 496 bytes.
• The Output table size cannot be larger than 492 bytes.
• Either table can be empty (0 bytes).
TIP
To configure CIP Safety I/O, see the following:
• GuardLogix Controllers User Manual, publication 1756-UM020 - August
2012
• Guard I/O DeviceNet Safety Modules User Manual, publication
1791DS-UM001 - May 2013
IMPORTANT
Automap is used in this example for simplicity. In some cases, if you want to
organize the I/O data in other ways, use the Advanced data table editor in the
Input and Output tabs. Refer to RSNetWorx online help for complete details.