Basics of EtherCAT
EP8309-1022
23
Version: 2.0.0
Fig. 10: CoE-Online tab
The CoE objects from x1000 to x1600, which are available in the example device "EL2502", can be seen in
the above figure; the subindices from x1018 are expanded.
Data management
Some parameters, particularly the setting parameters of the slave, are configurable and writeable. This can
be done in write or read mode
• via the System Manager (figure above) by clicking. This is useful for commissioning of the system/
slaves. Click on the row of the index to be parameterized and enter a value in the
SetValue
dialog.
• from the control system/PLC via ADS, e.g. through function blocks from the TcEtherCAT.lib library This
is recommended for modifications while the system is running or if no System Manager or operating
staff are available.
Note
Data management
If CoE parameters on the slave are changed online, this is saved fail-safe in the device
(EEPROM) in Beckhoff devices. This means that the changed CoE parameters are still re-
tained after a restart. The situation may be different with other manufacturers.
Startup list
Note
Startup list
Changes in the local CoE list of the terminal are lost
if the terminal is replaced
. If a termi-
nal is replaced with a new Beckhoff terminal, it will have the factory settings. It is therefore
advisable to link all changes in the CoE list of an EtherCAT slave with the
Startup list
of
the slave, which is processed whenever the EtherCAT fieldbus is started. In this way a re-
placement EtherCAT slave can automatically be parameterized with the specifications of
the user.
If EtherCAT slaves are used which are unable to store local CoE values permanently, the
Startup list must be used.
Recommended approach for manual modification of CoE parameters
• Make the required change in the System Manager. The values are stored locally in the EtherCAT slave
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