Corrected from:
Controller c300 V3.21
Panel Controller p300 V3.21
Response of the new version:
If, when using a device description from V3.21, more than 128 kByte of mains-failure-safe data (RETAIN) are declared, a corresponding error message appears when translating.
What happens?
The values of RETAIN variables are not completely saved in a power-failure-proof manner when the unit is switched off.
When does the behaviour occur?
If more than 128 kByte of power-failure-proof variables (RETAIN variables) are declared, no compiler error message is displayed during compilation. The power supply of the controllers is designed to save a maximum of 128 kByte of RETAIN variables in the event of a power failure. If more RETAIN variables are declared, problems may occur when saving/restoring the data.
Which products are affected?
Controller c300 from V3.8
Panel Controller p300 ab V3.8
Short-term measures:
Do not declare more than 128 kBytes of RETAIN variables.
Evaluation / recommendations:
If more than the permissible 128 kByte of mains fail-safe data are used in the PLC project, then the PLC Designer does not display an error message when translating the PLC project. This means that it is possible that the user creates an inadmissible amount of power-failure-proof data in the PLC project, which is then not saved in a power-failure-proof manner.
Automatic Translation
