Database System Concepts
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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Transmission media
A communication channel that transmits data from a source to a recipient is referred to as "transmission media." Electromagnetic impulses are used to transmit data. Transmission media's primary purpose is to transmit data in the form of bits via a local …
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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
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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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