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sa747sp

Weight display issues

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I have an analog value showing a set of ingredients weighed. I would like to display the weighed value decreasing and the dosing value increasing as it is emptied into a mixing chamber. I am OK with the weighed value but the dosing value must rise as the weighed value decreases. I am at a loss on how to do this and any help is welcome. Software s Logix 5000 Edited by sa747sp

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Assuming 'dosing value' starts at zero and increases directly as the 'weighed value' decreases then record before the emptying begins the 'original weighed value' then in the PLC compute while emptying takes place 'dosing value' = 'original weighed value' minus 'current weighed value' and display the 'dosing value'

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Look up the "SUB" instruction.

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