Gateway 312785C Automatic Update of the EDS File, Automatic EDS Update

Appendix A: DeviceNet™ Slave Communication

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. FIG. 37.

FIG. 37: Automatic EDS Update

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:

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.

•RSNetWorx master node Scanlist, Input Table, and Output Table

•ControlLogix PLC DeviceNet Scanner configuration

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