Thanks master Ixo65.

 Yes the module is standard .

Later when i come back home i will try it.

Thanks again

 Hi ixo65....thanks again.
There are some little  things to adjust....first when the water level reaches the 1500mm i need to set on the Q3 output until the level goes up to 1600mm,then it stops the Q3 and only reactivate it again at 1500mm...by now in the program simulation as soon at the level goes down from 1600mm to 1595mm it puts  the Q3 on, instead of waiting for 1500mm.The same delay for the Q4 between 1900mm and 2000mm is required.
Another issue : if for some reason  the water level drops down from 1500mm the Logo will never order any solenoid valve to refill the water  and I'll have the empty tank.The solution is to let the level goes down to critical (Q2=1400mm) and then order the Q3 untill reaches the 1600mm  level.
I think its better to add some 3 or 4 seconds delay at the refill points (at 1500mm and 1900mm).
What do you think about this....was i clear enough :)
Thanks in advance.
Regards

ixo65

Hello Picareto,

at first welcome to the forum.

Here is a possible solution. I hope I understood you correctly.

Since you did not write which LOGO! you have exactly and which LSC version, I have set as a hardware device 0BA8.Standard.

The address of the analog input for the sensor depends on how many analog inputs are enabled for a base module.
By default, 2AI are enabled for the base module. Thus, the addresses AI1 and AI2 are reserved for the base module.
The address for the first channel on the AM2 is thus AI3.

Sorry my english is not that good and the words sometimes are not the correct.
What i pretend is to monitoring water tank level and refill it with 2 solenoid valves acording to the  the pressure sensor values.
The top solenoid valve is the priority one and let me call it "Q4".This Solenoide valve refills the tank with water coming from a lake. It open when the level reaches 1900mm and it closes at 2000mm...it will open again as soon as the water is consumed in the tank and goes down again to 1900mm .....
The other solenoid valve is the alternative refill with public water supply (call it "Q3" ) and if there is no water coming from the lake  then it will work between 1600mm and 1500mm (similar to the Q4).This is where I think it is important to have a delay to ensure that at times the water level drops inadvertently from the 1500mm for a few moments.However if for some reason the water level drops from the 1500mm then the system must wait to reach the critical level and at that moment it activates Q3 until reaching 1600mm.
The third solenoid valve Q5  is the recirculation one that will work with that timer.I also need a critical level alert Q2 (below 1400mm) and a Q1 output to indicate the empty tank (below 400mm). These three items are already well programmed in the software.

Was I been more explicit now, ixo65? Hope so...and sorry again.
Thanks for the help

Thank you so much for your atention.
Your program lines were very usefull to me as i am *** in LOGO programming.For now I have developed the base program that you sent me. I added on/off buttons to the automatic position and pushbuttons to test the solenoids. I have modified the SF002 scale from 5000 to 2600 to get better resolution. I still have one more question: I was testing the program in  LOGO and if the pressure sensor splits a wire for example then the scale lowers to a negative value but still allows to power on  the solenoids in auto mode !! .... what should I do so that when the value drops to negative, the system became stopped?

Many thanks ixo65