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I'm doing a datalogger with a PLC Vision 130. This has to perform the following tasks: 1- Survey by Modbus to slaves 2- Save every 1 second the intoaccount to a table 3- Once the table is filled, pass the data to SD A full time card as I do to delete the first record of it to generate a cyclic deleted ??.

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Have a look at this post and it might give you ideas.  Not exactly what you want, but near enough.

Keep in mind that if you are communicating with a few slaves by modbus, you may not be able to do an accurate save every second, due to the inherent delays in the comms.

cheers, Aus

 

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