Beckhoff EL7037 User Manual download pdf (Page 33)

Basics communication

Fig.20: "CoE Online " tab

The figure above shows the CoE objects available in device "EL2502", ranging from x1000 to x1600. The

subindices for 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 (Fig. "CoE Online " tab) by clicking

This is useful for commissioning of the system/slaves. Click on the row of the index to be

parameterised and enter a value in the "SetValue" dialog.

• from the control system/PLC via ADS, e.g. through 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.

If slave CoE parameters are modified online, Beckhoff devices store any changes in a fail-safe manner in the

EEPROM, i.e. the modified CoE parameters are still available after a restart. The situation may be different

with other manufacturers.

An EEPROM is subject to a limited lifetime with respect to write operations. From typically 100,000 write

operations onwards it can no longer be guaranteed that new (changed) data are reliably saved or are still

readable. This is irrelevant for normal commissioning. However, if CoE parameters are continuously changed

via ADS at machine runtime, it is quite possible for the lifetime limit to be reached. Support for the

NoCoeStorage function, which suppresses the saving of changed CoE values, depends on the firmware

version.

Note

Data management

ü Data management function

a) If the function is supported: the function is activated by entering the code word

0x12345678 once in CoE 0xF008 and remains active as long as the code word is not

changed. After switching the device on it is then inactive. Changed CoE values are not

saved in the EEPROM and can thus be changed any number of times.

b) Function is not supported: continuous changing of CoE values is not permissible in view

of the lifetime limit.

EL70x7 33Version 1.0

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Beckhoff EL7037 User Manual Page 33