PLC Programming Question & Answer
Question & Answer - A PLC has been programming to control the starting and stopping of a three-phase electric motor....
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Example PLC Program
A PLC has been programming to control the starting and stopping of a three-phase electric motor....
Identify the Problem in the PLC Program
Identify the problem(s) in this PLC program, and modify it so that it will work as it should....
Troubleshooting PLC Permissive Inputs
We have a problem in one of the PLC Permissive Inputs that there is a programming mistake, do the troubleshooting....
PLC Program to Control a Water Pump
PLC program to control a water pump driven by an electric motor. It will be manually started and stopped by pushbutton switches, and shut down automatically by any one of...
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...
Mis-conceptions of PLC Ladder Logic
Perhaps the most important yet elusive concept to grasp when learning to program PLCs is the relationship between the electrical status of the PLC’s I/O points and the status of...
PLC Memory Mapping and I/O addressing
A wise PLC programmer once told me that the first thing any aspiring programmer should learn about the PLC they intend to program is how the digital memory of that...
PLC Program for Automatic Liquid Mixing Application
Liquid Mixing Application This is PLC Program for Automatic Liquid mixing Application. Problem Description In many industries, there are lots of mixing system are used for solutions mixing. Some plants...