Readings Mismatch between Field & Control Room ? Why
Instrumentation maintenance engineer often hears about process value mismatch from field transmitter display reading and control room DCS/PLC reading. Generally
PLC Tutorials
Tutorials of Programmable Logic Controller – Learn PLC programs and ladder logic lectures of GE, ABB, Siemens, Allen Bradley, Omron PLC’s.
Traffic Light Control using PLC Ladder Logic
We most often come across a three-way traffic jam in our city. This PLC program gives the solution to control
Difference between DCS & PLC Systems
DCS stands for Distributed Control System and PLC stands for Programmable Logic Controller. Do you know the Difference between DCS
4–20 mA Process Control Loops
In electrical signalling an analog current loop is used where a device must be monitored or controlled remotely over a
4-20mA Loop Power Supply Questions and Answers
Here we discuss about the general 4-20mA Loop Power Supply Questions and answers come across in industrial instrumentation. 4-20mA Loop Power
What is Relay Logic ?
Relay logic is a method of implementing combinational logic in electrical control circuits by using several electrical relays wired in a
PLC Raw Count Calculation for Pressure Transmitter
Every instrument has at least one input and at least one output. For instruments responding linearly, the correspondence between input
PLC based Automatic Bell System for a School
In a school, bell is activated by the PLC system. The bell will ring automatically at a fixed timing for
Transmitters 4-20mA Current Failure Alarm Limits
4-20 mA instrumentation and controls usually support a signal range slightly below 4 mA and above 20 mA. For transmitters,
What is Loop Checking?
The Loop checking is defined as pre-Commissioning activity which is initiated after installation of instruments in the field and carry out the
