The sensor should work.
You need to do the following:
Make a point list including each I/O point, the signal level, a description of the signal, engineering units for analog signals, the I/O card connected, and the PLC I/O address associated
Write a text description of each function the logic must perform, in the sequence it must be performed. Use a flow chart if you are more comfortable with that format.
Make a list of any operator adjustments and any alarm outputs and alarm functions.
Begin writing the ladder logic, starting with the simpler functions and adding new ones as you gain expertise