Ok so we know that there is a difference between the two, however, is the difference the same regarding percentage for example 203.0 ton on one & 205.02 is a difference of 1.98 tons this roughly equates to 1% so if the next daily totals were 303 & 306.02 then again it is roughly 1% give or take a bit as there could be presicion of the way the floating point maths work.
This would indicate that the main error is to do with scaling I would guess that the precision of the Red lion is not better than 0.2% given that the PLC may be the same but in opposite direction that could be 0.4%. So I think you need to log days of data to see if there is a similar difference, adjust the scaling on the PLC, & check again.
Regardless of if it is a scaling error or clock accuracy, if reasonably consistent then adjustment of one of the scaling parameters should bring it in closer, you will never get it exact, unless you use the atomic clock to drive both.
This would indicate that the main error is to do with scaling I would guess that the precision of the Red lion is not better than 0.2% given that the PLC may be the same but in opposite direction that could be 0.4%. So I think you need to log days of data to see if there is a similar difference, adjust the scaling on the PLC, & check again.
Regardless of if it is a scaling error or clock accuracy, if reasonably consistent then adjustment of one of the scaling parameters should bring it in closer, you will never get it exact, unless you use the atomic clock to drive both.
Last edited: