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Enable limits

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I have come across what seems to me to be an anomoly.

I have a screen with 4 variables I can press the enter button to tab through the variables

without entering a new value. However one variable always sticks and requires a new value

as if the value displayed is wrong.

After much messing around it seems to be associated with the "enable limits" option if its off no sticking

I have linearity settings display -10 to 190 MI 0 to 16383

I have Limits of -8 to 90 (display value referenced) this sticks

If I combine the axis with limits -8 to 9011 all is well.

It appears to me the PLC is checking against Display values on data entry and MI values on subsequent edit

Is this correct or am I talking rubbish

your view would be appreciated.



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