PLC Permissive for Motor Control
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,...
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Troubleshoot Allen Bradley PLC Logic
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...
Difference between DCS, PLC, and RTU ?
One of the most common questions is regarding the difference between DCS and PLC as well as between PLC and SCADA – and if there is any difference at all...
Motor Trip Logic using PLC Programming
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
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
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...
Programmable Logic Controller Questions and Answers
Refer the below Programmable Logic Controller Questions and Answers which are useful for the exam preparation. Programmable Logic Controller Questions 1. A switch or a pushbutton is a ________ input. 2....
PLC Programming Questions & Answers – 5
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
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
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”...