System and robot

A system comprising:

• a housing which has a front wall including a plurality of openings for access to a cassette storing a wafer and a back wall facing the front wall;
• and
• a robot arranged in the housing, wherein
• the robot has
• a first base,
• a first movable portion which has a first arm having a proximal end side connected to the first base to be rotatable about a first rotation shaft in a vertical plane and a second arm having a proximal end side connected to a distal end side of the first arm to be rotatable about a second rotation shaft in the vertical plane,
• a second movable portion which has a second base having a proximal end side connected to a distal end side of the second arm to be rotatable about a third rotation shaft in the vertical plane, a third arm having a proximal end side connected to a distal end side of the second base to be rotatable about a fourth rotation shaft, and a hand having a proximal end side connected to a distal end side of the third arm to be rotatable about a fifth rotation shaft and holding the wafer, and
• a control unit which controls the first movable portion and the second movable portion so as to cause the hand to access each of the plurality of openings in a state where the hand is parallel to a horizontal plane, and
• the plurality of openings are positioned in a maximum accessible region of the hand determined based on a position where the robot is arranged in the housing, a length of the first movable portion in a state where the first movable portion is maximally extended, and a length of the second movable portion in a state where the second movable portion is maximally extended.