FOXBORO A2H124-24FX-RH Industrial switches

An operator activates a start switch. This causes a motor to advance the wire a distance of 10". When the motion stops, the controller generates an output signal which activates the cutter. Allowing 100 ms for the cutting completes the cycle. Suppose that the motor drives the wire by a roller with a 2" diameter. Also assume that the encoder resolution is 1000 lines per revolution. Since the circumference of the roller equals 2π inches, and it corresponds to 4000 quadrature, one inch of travel equals: 4000/2π = 637 count/inch

This implies that a distance of 10 inches equals 6370 counts

 and a slew speed of 5 inches per second, for example, equals 3185 count/sec. The input signal may be applied to input 1, for example, and the output signal is chosen as output 1. The motor velocity profile and the related input and output signals are shown in Fig. 7.1. The program starts at a state that we define as #A. Here the controller waits for the input pulse on I1. As soon as the pulse is given, the controller starts the forward motion. Upon completion of the forward move, the controller outputs a pulse for 20 ms and then waits an additional 80 ms before returning to #A for a new cycle.

X-Y Table Controller

 An X-Y-Z system must cut the pattern shown in Fig. 7.2. The X-Y table moves the plate while the Zaxis raises and lowers the cutting tool.The heavy solid curves in Fig. 7.2 indicate sections where cutting takes place. Those must be performed at a feedrate of 1 inch per second. The light lines correspond to non-cutting moves and should be performed at 5 inch per second. The acceleration rate is 0.1 g. The motion starts at point A, with the Z-axis raised. An X-Y motion to point B is followed by lowering the Z-axis and performing a cut along the circle. Once the circular motion is completed, the Z-axis is raised and the motion continues to point C, etc. Assume that all of the 3 axes are driven by lead screws with 10 turns-per-inch pitch. Also assume encoder resolution of 1000 lines per revolution.

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