User Manual

10 Device replacement - replacing the controller (in the event of
service)
77 Lenze · Controller | Parameter setting & programming · Reference Manual · DMS 1.5 EN · 04/2014 · TD17
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10.4 Subsequent use of retain data on the new controller
 How to proceed in case of 3221 C/3231 C:
In order to be able to further use the retain data of the Controllers 3221 C/3231 C after a
device replacement, ...
• save the desired data to the SD card from the application;
• restore the desired data from the application.
Further information on the use of retain variables.
Creating remanent variables (retain/persistent)
( 64)
Storage of retain data on the SD card (only Controllers 3221 C/3231 C) ( 65)
 Note!
Depending on the used controller, the retain data of the PLC may no longer be available
after a voltage failure/device replacement.
• Controllers 3221 C/3231 C save the retain data internally (in the device, not
on the SD
card). Hence, the retain data of the replacement device correspond to the output
values (default values).
•The Controllers 3241 C, c300, p300 and p500 save the retain data on the SD card.