Im following the https://www.wago.com/global/lp-thank-you-onlineseminar-data-logging video and creating a data logger on my PFC300 controller to write to CSV files on an SD Card. I am giving the user a settable option to write a data point every 1 - 60s for process data recording. For this I am usin…

First, I would suggest to use only industrial grade SD cards like WAGO’s. They have up to 20 000 write cycles per cell and up to 10 years data retention. The max number of writes is a number per cell, and not for the whole SD card of course. The lifetime will depend on many factor like the free s…

Thanks @quenorha for the explanation. Makes sense with the industrial grade SD cards. How would the buffer look in practice? I am assuming that every call to the FbGeneralFile_Write_mod function constitutes a write. Each line in my process data file is close to the 255 character limit for a string.…

What I have done in the past and seems rather easy to implement is create an array of your data types, in this case you would have 3 different UDT’s. I will then make an array of those data types of, lets say 100 items. When the array gets full, simply copy the “live” array to the “write” array. …

Totally agree about the mechanism.

Thanks all for the insights. I chatted with support to get some help on how best to implement the writing of the array to a CSV file as I ran into issues with gibberish (ascii characters) written at the end of each string in the CSV. This was because the code was writing the complete string and ther…

The main problem is that this is SD card :smiley: SD cards have internal controller, wear level and specific block size. Writes are available only in ‘pages’ (eg. 4kB size) You cant write 100bytes directly! To write some data SD card have to: find offset in file, calculate sector SD card contr…

hello, When using influxdb 1.8 to store data and grafana to watch the data , is there a automatic buffer mecanisum in influxdb , to avoid too much writtings on Sd card ?

In WagoAppInfluxDB library there is function block with buffered write. Influx itself do jobs in background like compacting database, but if you use buffered write it should work perfect :ok_hand:

Thank you for that explanation. I can install influxdb and grafana on a pfc 200 8212, but only a version 1.8 of influxdb, as the PLC 8212 is 32 bits and not compatible with version 2 of influxdb . all of thoses programs take a lot of place on the memory of the PLC , and I tried to move all of that…

Hello JF, See the following link, there is a tutorial for this. [image] GitHub - WAGO/docker-ipk: This repo contains static linked binaries of... This repo contains static linked binaries of docker ce packed in linux ipk format.

Data logging to flat file (CSV) and SD card longevity

Hardware and Linux

RobPaq June 17, 2026, 8:27am 11

Hello JF,

See the following link, there is a tutorial for this.

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Data logging to flat file (CSV) and SD card longevity

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