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PROGRAMMABLE LOGIC CONTROLLERS

PROGRAMMABLE LOGIC CONTROLLERS

Database System Concepts
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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PROGRAMMABLE LOGIC CONTROLLERS

The process shown in figure 1 involves pumping fluid from Tank A to Tank B. The operation of the process can be described as follows, Before starting, PS1 must be closed. When the start button is pushed, the pump starts. The button can then be released and the pump continues to operate. When the stop button is pushed, the pump stops. PS2 and PS3 must be closed 8s after the pump starts. If either PS2 or PS3 opens, the pump will shutoff and will not be able to start again for another 15 s. For the above mentioned conditions develop a ladder program using direct method and provide the allocation list. Tank A PS1 PS2 PS3 O Pump Figure 1 Tank B
Transcribed Image Text:The process shown in figure 1 involves pumping fluid from Tank A to Tank B. The operation of the process can be described as follows, Before starting, PS1 must be closed. When the start button is pushed, the pump starts. The button can then be released and the pump continues to operate. When the stop button is pushed, the pump stops. PS2 and PS3 must be closed 8s after the pump starts. If either PS2 or PS3 opens, the pump will shutoff and will not be able to start again for another 15 s. For the above mentioned conditions develop a ladder program using direct method and provide the allocation list. Tank A PS1 PS2 PS3 O Pump Figure 1 Tank B
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