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Appendix A: DeviceNet
™
Slave Communication
312785C 51
Automatic Update of the EDS File
DeviceNet nodes use an EDS (Electronic Data Sheet) to
describe the communications parameters available at
each device on the DeviceNet network.
By design, each DeviceNet master can handle a maxi-
mum of 124 Input words and 123 Output words. In the
default EDS file for the Gateway, the Input and Output
data sizes are set at 16 bytes each. This equates to four
words of data input and four words of data output. These
values can be set higher, but it is important to note that if
the default values are set higher, they might conflict with
other DeviceNet implementations.
Gateway provides an EDS file generator tool to create a
file that matches your Gateway settings. This file can
therefore be used to configure the Master.
To generate this file, enter the Communications module
and select the DeviceNet interface on the left. Under the
Electronic Data Sheet, select Yes in Synchronize and
choose the path and name where the file should be
saved using the Browse button. F
IG. 37.
Saving the database using the File>Save command will
synchronize and therefore update the EDS file.
Each time EDS parameters are modified, the EDS file
will need to be re-registered within RSNetWorx for Devi-
ceNet. These changes will also need to be reflected in
the following locations:
• RSNetWorx master node Scanlist, Input Table, and
Output Table
• ControlLogix PLC DeviceNet Scanner configuration
NOTE: Inputs and Outputs are with respect to the mas-
ter, therefore inputs refer to data sent from the slave and
read by the master.
F
IG. 37: Automatic EDS Update