a.A cylinder moves from the "rear" position [E1] to the "front" position [E2] and vice versa
b.The movement is triggered by pressing the [E3] button
c.If the cylinder is at E1 when the button is pressed, the cylinder moves to E2, if the cylinder is at E2 when the button is pressed, the cylinder moves to E1
d.The movement E1 to E2 is controlled by the "Cylinder forward" valve [A1].
e.The movement E2 to E1 is controlled by the "Cylinder back" valve [A2].
