How to change variabels in simulink?

Hi!

My case is this, I want to create a relay with different ON/OFF values.

I would like there to be 2 variabels that is named ON and OFF and have them update the relay values if certian conditions are true. For exampel.

If x > 0 ON=1; OFF=0; (the values for relay are now ON 1 and OFF 0)

elseif x < 0 ON = 2; OFF =-1; (the values for relay are now ON 2 and OFF -1) end

Is there any way to do this? I have tried to use to Matlab Function block but I have not been able to declare variabel here that I can use in my relay.

Thanks for any reply.