Ladder Logic Example with Timers
Build the ladder logic example with Timers to turn ON/OFF the lamp using push buttons with respect to program logic conditions. PLC Logic 1. Start PB and Stop PB are...
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OFF Delay Timer using PLC
This article discusses about OFF delay timer instruction and its working principle using Allen Bradley Programmable Logic Controller (PLC) Ladder Logic. Timer OFF delay is to delaying the turning OFF...
ON Delay Timer using PLC
This article discusses about ON delay timer instruction and its working principle using Allen Bradley Programmable Logic Controller (PLC) Ladder Logic. ON Delay Timer In the above On-delay timer instruction,...
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,...
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...
How to Interchange ON Delay Timer and OFF Delay Timer in a PLC
Timer functions are most important in PLC Programming. Logics play the important role in PLC Programming. According to PLC programmer’s skills, logic will get different in application. In this program,...
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....