I want your help. I got the readings of a load cell as 4-20 mA every 2 minutes. i want to store the first reading and then it should be subtracted from the reading of the next 2 minute. this should be continuously running. Is this possible? How to store this reading? and Connect it with the Mathematical Instruction Block?

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Split from LOGO internal memory.

The trick is to use the Mathematic instruction to hold the analog value.