Embedded Networking with CANopen
By Olaf Pfeiffer
[ Select a Protocol | HLP | Overview | Device Profiles | EDS | PDO | NMT | Implementing ]
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Electronic Data Sheets
Electronic Data Sheets (EDS) offer a standardized way on specifying supported object dictionary entries. Any manufacturer of a CANopen module delivers such a file with the module, which in layout is similar to the ".ini" files used on Microsoft Windows operating systems.
A CANopen master or configuration tool running on a PC with a CAN card can directly load the EDS into its set of recognized devices. Once a device is found on the network, the master or configuration tool will try to find the matching EDS. Once found, all supported object dictionary entries are known by the master / configuration tool.
Figure 2 shows the relation between Device Profiles and Electronic Data Sheets. The Device Profile specifies the minimum entries that need to be supported by a device conforming to the profile. In addition, the EDS might specify objects that are specific to a certain manufacturer or sub-type of modules.
Figure 2 How a Master or Configuration Tool Gets to Know All Nodes
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