Variable Analog

I wonder if you can help

I am looking to drive a variable analogue between two known points say 10mA and 18mA for example

What I would like to do is switch on an input and then the analogue vary or modulate randomly between these points. I don't want it to move quickly so go from 13mA to 16ma as a step change I would prefer it to move from 13mA 13.5mA 14mA 14.5mA 15mA 15.5mA 16mA so a gradual change so over 30secs

and then move again to the next variable...

As much as I have thought about this I can not see away to do this easily. or even know if the Logo 8 can do it.

Any thoughts any help gratefully received

PB

Something like this.

Its NOT random, but slow from 100 to 180 and back

Notice: Analog outputs works intern in the LOGO with 0 - 1000,

0 = 0 Volt or 0 mA  1000 = 10 Volt or 20 mA.

You must correcting the settings for your own wishes

That is very clever thanks for that. I am very impressed

PB