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Instrumentation Questions For You

Motor Trip Logic using PLC Programming

S Bharadwaj Reddy
Programmable Logic Controller (PLC) Questions and Answers This PLC is being used to start and stop an electric motor, and also to shut it down automatically if any of three

PLC Pump Permissive Interlocks

S Bharadwaj Reddy
The following PLC program was written to control the operation of a large electric motor-driven pump. A variety of “permissive” inputs protect the pump from damage under abnormal conditions, and

PLC Electric Motor Interlocks

S Bharadwaj Reddy
Programmable Logic Controller Questions and Answers The following PLC program was written to control the operation of a large electric motor-driven pump. A variety of “permissive” inputs protect the pump

PLC Programming Questions & Answers – 7

S Bharadwaj Reddy
A engineer needs to write a program for an Allen-Bradley CompactLogix PLC to control a pressure relieving solenoid valve in a gas processing system. A pair of high-pressure control switches

PLC Programming Questions & Answers – 6

S Bharadwaj Reddy
A engineer needs to write a PLC program to control a water pump driven by an electric motor. This water pump will be manually started and stopped by pushbutton switches,

PLC Programming Questions & Answers – 5

S Bharadwaj Reddy
A engineer needs to write a PLC program to control a water pump driven by an electric motor. This water pump will be manually started and stopped by pushbutton switches,

PLC Programming Questions & Answers – 4

S Bharadwaj Reddy
A engineer needs to write a PLC program to control a water pump driven by an electric motor. This water pump will be manually started and stopped by pushbutton switches,

PLC Programming Questions & Answers – 3

S Bharadwaj Reddy
A PLC has been programming to control the starting and stopping of a three-phase electric motor. The program is supposed to require that the operator press and hold the “Start”

PLC Programming Questions & Answers – 2

S Bharadwaj Reddy
A PLC has been programming to control the starting and stopping of a three-phase electric motor. Shown here is a partial wiring diagram and offline PLC program display for the

PLC Programming Questions & Answers – 1

S Bharadwaj Reddy
A PLC has been programming to control the starting and stopping of a three-phase electric motor. Shown here is a partial wiring diagram and offline PLC program display for the

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