Can we make Analog Variables retainable for Warm & Cold Startup in M580 ?

[RuchirSomani]

Hi,

Right now I am using M580 configuration wherein I have created an Internal Variable('x') which hosts the arithmetic calculation of 2 other analog variables('y' and 'z').

Whenever M580 restarts, the variable 'x' goes back to 0.
a) Would it be possible it retains the last value after restart of M580 ? 

b) If Yes, where to enable this configuration in Control Expert tool ?