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
Process Control High Level Alarm Fault Analysis
An operator reports a high level alarm (LAH-12) displayed at the control room for the last 13 hours of operation,
Compressor Emergency Shutdown Root Cause Analysis
The compressor emergency shutdown system (ESD) has tripped the natural gas compressor off-line three times in the past 24 hours.
Chemical Mixing Process using PLC
Design a PLC Ladder Logic for Chemical Mixing Process. We have RSLogix 500 PLC Programming software to create PLC logic
Solenoid Valves Practical Problems
Suppose this valve control system has a problem. The control valve (LV-104) does not move to the full-open position as
PLC Automatic Pedal Switch for Speed Control
We need to use pedal switch control logic at machine work shop for speed control of motor. Write the PLC
Different Types of Turbine Protective Devices
This article provides the list of different types of Turbine Protective Devices like turbine over speed trip, low lube oil pressure,
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
Liquid Flow Control Loop Controller Action
A liquid flow control loop consisting of a flow transmitter (FT) to sense liquid flow rate through the pipe and
Objective Questions of Building Fire and Gas Detectors
Read the Objective Questions of Building Fire and Gas Detectors, Building Automation Objective Questions and Fire & Gas System Engineers