Program in ladder simatic 7

There is a PLC with 4 analog inputs (start address 124) and 16 discrete outputs (start address 140). A variable voltage source is connected to the 4th analog input. The source is varied between 0 to 10v. Define Two brands used in the program that must have the value of high limit (8.5) and low limit (2.5) Implement a ladder program that: If the input voltage value is less than the low limit, a lamp connected to the physical output is activated, otherwise it is deactivated. If the input voltage value is greater than the high limit, another different lamp connected to the physical output is activated oscillating, otherwise it deactivates When it is activated, it does the following: In the first overshoot of the high limit, the oscillation is: 2sg ON / 2sg OFF The second overshoot of the oscillation high limit is: 1sg ON / 1sg OFF A subsequent overshoot of the high limit the oscillation returns to: 2sg ON / 2sg OFF And so the period of oscillation would continually change ... NOTE: use a maximum of 2 timers