How long program can be stored in M241 PLC

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The Program is stored in non-volatile ROM, which does not require battery backup and should remain intact in the order of years.

There is a persistent memory area that allows retaining variable values after a power cycle.
This data is stored in the Non-volatile RAM - not requiring a battery.
The variables can be defined in the code with SoMachine / EcoStruxure Machine Expert software.