Lenze PC-based Automation Industrial PC - Manual (Page 77)

2.5 EN - 01/2012
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77
Industrial PC | Parameter setting & configuration
Data integrity in the case of a voltage failure
Backup for systems without UPS
10.3 Backup for systems without UPS
If you use an Industrial PC without UPS, you should ensure in advance that important data
will not get lost in the event of a voltage failure. This backup involves
 the saving of the PLC's retain variables
 the persisting of the IPC parameterisation and
 the persisting of the log files.
10.3.1 Persisting the PLC's retain variables
The PLC offers the SysSaveRetains function by means of which all retain variables can be
saved from the PLC program. Furthermore you can define cycles for saving the retain vari-
ables.

Tip!
Detailed information on this function can be found in the »PLC Designer« manual.
10.3.2 Persisting the IPC parameterisation
You can persist the IPC parameterisation manually using the »Engineer« and the web-
based parameterisation.
»Engineer«
For this purpose, use command "279: Persist all data" in the »Engineer«, which you can ex-
ecute via code 18.
Web-based parameterisation
 In the web-based parameterisation you press the Device command button.
 Select the entry "279: Persist all data" from the Command list field.
 Click the Persist button.
– OK appears in the "Status" field.

Note!
Only the use of a UPS guarantees that the data is saved in the event of a voltage
failure.

Note!
CF cards only have a limited number of write/read cycles. It is therefore not use-
ful to save the retain variables at very short time intervals.