Ali

Thanks Dave for your example, however, we want to trigger the maintenance based on the failure probability of the machine not based on the pressure value. the failure probability if a function of (x,Y). let say that: Pressure = X(t)= kt, t= processing time, k=constant Temp= Y(t)= sin(t)+6t Failure Pr.= P(X,Y) Po= 0.75. >> threshold if Pr(X,Y)=> 0.75 stop the machine. my first thought was to model those two measures as resources put then I couldn't figure out a way to link that with the reliability logic

I'm trying to model a machine with two sensors, one measures pressure and the other measures vibration. the machine failure rate depends on those values that we need to monitor. lets say that both measures are function of time. X(t)= Pressure Y(t)= Temp. the failure rate will be a function of x and y and we want to trigger the maintenance if the conditional failure probability exceeds the threshold. any idea or hints on how to model this in simio? ~Ali