Programming a timer function

[Solvaer]

Hello. 

im pretty new to unitronics plc's and im wondering if some guru's here would like to help me solve my problem.

im struggling to figure out how to change a timer value depending on how full a tank of water is. the timer is suppose to be changeable. currently set at 3 minutes. 

The proces

Tank 1: no features

Tank 2:

There is an preassure transmitter which mesuares the height of the water in the tank

this level is used so that the tank 3 can pump water back to tank 1 without having tank 2 pumping in too much water to tank 3. 

there is also a pump which pumps water in to tank 3

Tank 3

Pumps water back to tank 1 (some water is drained out of the tank.

There is only a level transmitter in tank 2. tank 1 and 3 does not have any way to measure the level. (not needed beacouse the water in tank 1 drains down to tank 2, and the water in tank 3 drains out of the tank aswell)

 

What im trying to figure out:

0% full = 100% of 3 minutes

25% full = 75% of 3 minutes

50% full = 50% of 3 minutes

75% full = 25% of 3 minutes

100% = 5% of 3 minutes

Im trying to load these values to the same timer. depending on which level tank 2 currently possesses .

There is a simular program to the one im trying to make on the m90 plc. but we have upgraded to a samba 7 for this project. i will attach some pictures of how it has been done earlier.

i did not find the system operand in visilogic. 

Keep in mind that im only 19 years old and dont have too many years of experience when it comes to programming

 

 

[Joe Tauser]

This is much easier in a Vision system.

There is a Store to Timer Preset function under the Store menu-

Unitronics timers base value is 0.01 seconds, so your preset values must be scaled accordingly.  The above picture shows three minutes, or 180.00 seconds.

Joe T.