What values can we get from the manual?

X < 20 = 30
X >= 40 AND X < 60 AND Y >= 40 AND Y < 80 = 50
X >= 60 AND Y >= 40 AND Y < 80 = 80
X >= 60 AND !(X >= 60 AND Y >= 40 AND Y < 80) = 30
X >= 20 AND X < 60 AND !(X >= 40 AND X < 60 AND Y >= 40 AND Y < 80) = 0

note:
X < 20 = 30
X > 80 = 30
X < 40 = 0
X < 60 AND Y >= 40 AND Y < 80 = 50

You can simplify further by first checking whether X is in the +50 range, and send 50 or 0. Then check if X is in the 'original' 30 or 0 range. i.e. the first processor sends two values.

The second simply checks if y is in the +50 range, and if yes takes the first value from x (0 or 50) and ignores it otherwise. Then it adds the second value (0 or 30) and Bob's your uncle.