Data logging with S7-1500 PLC CPU in CSV format Read/Write on MMC

Hi Anklesh. There is a pretty good FAQ on this link.

https://support.industry.siemens.com/cs/us/en/view/109482591

Here is a example of calculating the Life of an MMC

You calculate the service life of the 32 GB SMC as follows:Calculation of the service life for the 32 GB SMC(6ES7 954-8LT03-0AA0)
The example below shows which write volume is available for the 32 GB SMC

Example 1
If you write one data block of 160 bytes to the SMC per second, then the safe data storage on the SMC is 32 TB / 160 bytes/s = 200,000,000,000 seconds
(theoretically 6334 years assuming 1 year = 365.24 days).

Example 2
If you write one Data Log (csv) of 160 KB to your SMC per second, then the safe data storage on the SMC is 32 TB / 160 KB/s = 200,000,000 seconds (theoretically 6.34 years).