RAMP function Step7 MicroWIN 3.2/4.0

Hello
I'm new in PLC programming, and i got a seminar work in PLC ladder programmning.
I have to make a RAMP funkcion in MicroWIN 3.2 or 4.0 and shall not use a finished function block (like i found one on the siemens automation page). So if anybody can help me or has such a function i would appreciate. Any help would be useful.

What do you have so far? What problem do you face?

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Regards,

Hi
1) Decide gradient
2) Take a register, say VW100.
3) Start incrementing VW100 after intervals to satisfy gradient.