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...
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...
PLC Program for Sequential Motor Control
Sequential Motor Control This is PLC Program for Sequential Motor Operating System. Problem Description In many industries, there are lots of motors are used. Sometimes we need to start more...
PLC Program for Two Way Switch Logic
This is PLC Program for Two ways switch logic for staircase light in house PLC Two Way Switch Logic In duplex type house there are ground floor and first floor and...
PLC Program for Automatic Lamp Control in Storage Facility
Automatic Lamp Control This is PLC Program for Automatic lamp Control in Godown (Storage Facility). Problem Description In old process, when the person enters in the godown (Storage facility), he/she...
PLC Program for Automatic Parameter Initialization when Power UP
Parameter Initialization when Power UP This is PLC Program for Automatic Parameter initialization when power up. Problem Description In many applications it is necessary to initialize some data when machine...
PLC Program for Latching and unlatching Circuit
PLC Latching and unlatching Circuit This is PLC Program for Latching and unlatched circuit for output. Problem Description In some conveying system operator fills tank manually by operation water pump manually....