3PRR pick and place delta robot

i am modifying on pick and place library for delta robot on simulink, i am using 3 prr delta robot, i entered the robot from solidworks and made some modifications on functions...i am having error on feedbackloop so i used memomry block, i think it worked but for specific input, i now donot know which input should i enter or donot know the end effector is in what position, donot know values of x, y, z of end effector, and if i should remove the memory block, how to solve algebric loop error generated???i donot know at which point the solver stops or where is the problem.