June 15, 1997
June 15, 1997
June 18, 1997
2.221.1 - 2.221.8
Implementation of a Laboratory Learning Module for Process Monitoring and Control
Carlos Aldana, Winston F. Erevelles, IMSE Department, GMI Engineering & Management Institute
Abstract This paper describes the development of a laboratory module in automation that presents students with an experience in sensors, data collection and system control. The module features an Allen Bradley Programmable Logic Controller (PLC), a pick and place device with two degrees of freedom and two set point control modules mounted on the gripper and the rotary axis of the pick and place device, a chute and escapement for accurate part feeding and sensors for part-size detection, and the detection of the limits of travel of the pick and place device.
The system is designed to distinguish between and recirculate steel balls of three different sizes (7/32”, 1/4”, 9/32”). Inputs and outputs of the system were examined and the appropriate ladder logic was developed. This ladder logic acts as the main control for the system, however the PLC features a data highway which was used to interface our pick and place device to a supervisory control and data acquisition (SCADA) software and develop a man-machine interface (MMI).
During the development of this module, students were exposed to a series of different fields, from the mechanical design of the system, wiring of the set-up, implementation of the ladder logic and development of the man-machine interface.
Description of the work-cell The plan view of the basic layout of the workcell appears as Figure 1. The pick and place device is a PHD multi-motion actuator with two degrees of freedom. The base of the actuator is a rotational joint with 180o of motion in the horizontal plane. The second degree of freedom is provided by a linear actuator with a 4” stroke in the vertical plane. The actuators are equipped with magnetic bands on the pistons that activate externally mounted Hall effect sensors. This helps to interface the actuator to various logic systems - an Allen Bradley SLC 5/02 PLC in this case. Using a collet adapter, one end of an aluminum arm is attached to the end of the linear portion of the actuator. A miniature parallel gripper has been mounted to the other end of this arm. A special purpose Hall effect sensor is mounted upon the gripper to track the sizes of the balls acquired by the gripper.
Aldana, C., & Erevelles, W. F. (1997, June), Implementation Of A Laboratory Learning Module For Process Monitoring And Control Paper presented at 1997 Annual Conference, Milwaukee, Wisconsin. https://peer.asee.org/6601
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