INGENIERIA EN AUTOMATIZACION INDUSTRIAL

Some machines are driven by a hydraulic system made up of a pump, a main valve plus secondary valves whose job is to move the machine's cylinders. In this problem we are going to control an eight cylinder machine. We will focus on just the secondary valves which will be of the double effect type.  The operator will control the up and down movements of the cylinders with a cable pendant, The UP and DOWN push buttons are pulse signals while C1 through C8 are level signals. In order to operate the machine he must first choose the upwards or downwards direction by pressing and inmediately releasing the UP or DOWN push buttons. Then he must proceed by selecting the cylinder he needs to work with by pressing one of the eight buttons C1 to C8. As long as he keeps the button pressed down the cylinder will move but it will come to a stop as soon as it is released. For safety reasons there is also an E-Stop and a RESET push buttons. As per EN 60204-1 Safety of Machinery, the push buttons to

STEPPER MOTOR CONTROL A stepper motor rotates by a specific number of degrees in response to an electrical input pulse. It is an electromagnetic incremental actuator that converts digital pulse inputs to analog shaft motion. A train of pulses  is made to turn the shaft of the motor by steps. No position sensors or feedback control loops are required. We are going to design and implement a digital program for the control of a variable-reluctance single-stack four-phase two-pole stepper motor. There are four digital inputs to the motor (D,C,B,A). The step size is 45º. The motor can rotate both in the clockwise and counterclockwise directions depending on the sequence we use when energizing the windings. For the clockwise rotation the windings must be energized in the following sequence: A, A and B, B, B and C, C, C and D, D and A, A. The direction of rotation can be reversed by reversing the sequence of switching the windings: A, A and D, D, D and C, C, C and B, B, B and A, A. There wil