Does Siemens S7-200 require a battery ?

[Mohamed El]

Hello Everyone

If a Siemens PLC does not contain the optional battery or if its battery is discharged, will we lose the program if the super cap is discharged (within 50 hours for CPU221)?

Thanks in advance for your answers.

 

[JesperMP]

It is described in page 36 in this manual:
https://cache.industry.siemens.com/dl/files/582/1109582/att_22063/v1/s7200_system_manual_en-US.pdf

TLDR:
The program code is in internal non-volatile memory.
Retentive data values are retained by the super-cap or optional battery.

 

[BryanG]

The program is not lost of the battery and supercapacitor are discharged. Data fixed in the program is not lost, but memory data set to be retentive is lost.