PLC Analog Input Conversion Formula
For any unit conversion on any PLC, you can use four function math with the following for PLC Analog Input Conversion Formula, which assumes integer math, as follows : PLC…
PLC Digital Signals Wiring Techniques
Ina process plant, on/off control is done through the PLC or DCS. The below Figure is an overview of one discrete/digital (on/off) circuit, showing the entire process from the power supply…
PLC Analog Signals Wiring Techniques
Unlike the discrete/digital (on/off) circuit, analog signals vary across a range of voltage or current. Taking the same vessel described previously in Digital wiring example, how would the wiring change…
PLC Problems Troubleshooting
Troubleshooting PLCs can be started by checking the healthiness status of CPU, I/O Modules, Fuse Blow-out and different PLC Failure reasons including wiring, field transmitters healthiness status or transmitter configuration,…
How PLC Reads the Data from Field Transmitters
Instrumentation and control rely on converting physical or process variables into a more useful format for the operator display. Pressure in a pipe is converted to mechanical deflection of a…
How a PLC do the Scaling for a Sensor ?
I am always surprised how an automation system like PLC or DCS does the scaling for a sensor ? or even sometimes thinking about a simple field transmitter scaling techniques…
DCS versus PLC Architecture
The main difference between DCS and PLC is the business model which we discussed with comparison of DCS Versus PLC Architecture. DCS versus PLC Architecture The DCS business model can…
Difference between DCS, PLC, and RTU ?
One of the most common questions is regarding the difference between DCS and PLC as well as between PLC and SCADA – and if there is any difference at all…
PLC Motor Control Ladder Logic Programming
Now we are discussing about How a PLC Motor Control ?. Before going into the article, let us assume some conditions here. A PLC has to start a Motor when the…
PLC Program for Star Delta Motor Starter
Motor contactors are controlled by using PLC. The following section of PLC tutorial will explain the ladder programming for star delta motor starter.
