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# lab #4 - Programming the Allen Bradley PLC5 Lab 2 Timers...

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Programming the Allen Bradley PLC5 Lab # 2 Timers and Counters April 15 2008 – Part A April 22 2008 – Part B Set 4D Mike Borton Mike Panz

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Objectives: To investigate the performance and capabilities of On/Off, Proportional and Proportional-Integral controllers. To measure, calculate, and program the temperature sensor transfer function, and to learn about operating and control differentials and to see how the proportional controller gain affects the performance of the controller. Introduction: This lab is relevant to the Mechanical Engineering industry because it allows us to use these On/Off, Proportional and Proportional-Integral controllers to control many applications. Many things in the industry can be controlled by these controllers. The temperature of anything usually needs to be controlled to get set results and these 3 methods are a good way of doing that. On/Off Control ON/OFF with a 24V Power Supply Power Supply 24 volts 40˚C Setpoint 55˚C Setpoint Turn on temperature ˚C 39.5 54.5 Turn off temperature ˚C 40.5 55.5 Highest observed temperature ˚C 41.76 56.606 Lowest observed temperature ˚C 39.215 54.534 Operating differential ˚C 1.0 1.0 Controller on time (s) 4.1 4.7 Controller off time (s) 51.4 24.3 Controller Duty Cycle (%) 7.3 16 ON/OFF with a 12V Power Supply Power Supply 12 volts 40˚C Setpoint 55˚C Setpoint Turn on temperature ˚C 40.5 54.7 Turn off temperature ˚C 39.5 55.7 Highest observed temperature ˚C 40.87 55.754 Lowest observed temperature ˚C 39.528 54.656 Operating differential ˚C 1.0 1.0 Controller on time (s) 11.3 21.3 Controller off time (s) 37.4 16.1 Controller Duty Cycle (%) 23.2 56.95
I/O Listing for On/Off Control Input N9:10/0 – NO – Power Up Bit N9:5/15 – NC – Block Transfer Write Control Block N9:0/15 – NC – Block Transfer Read Control Block B10:0/0 – NO – Block Transfer Write Configure Bit S:1/15 – NO – First Scan of Ladder or SFC step Output O:011/5 – Latch – Latches the Heater Relay O:011/5 – Unlatch – Unlatches the Heater Relay Register/Timer F8:0- Calibrated Potentiometer – Setpoint command from Potentiometer Calibrated in ◦C F8:1- Calibrated Temperature – Feedback signal from the Temperature Sensor Calibrated in ◦C

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