Two Hand Control Logic using PLC
This article is about the programming of two-hand control used in the press industry. The purpose of this program is about safety to prevent fatal accidents. Below is an image…
Grounding or Earthing Scheme in DCS or PLC Systems
First, let us understand the difference between grounding and earthing. Whenever the DCS or PLC systems are grounded, they still not connected to the earth. The system has a ground…
PLC Programming using Level Switches
This article about "PLC programming to control the level in the tank using three point conductive level switches for motor start & stop logic". The level measurement plays a vital…
How to take Backup from Siemens S7-300 PLC?
Step by Step procedure to take program backup from Siemens S7-300 PLC using Simatic manager with screenshots. Backup from Siemens S7-300 PLC Step 1: Open Simatic manager. Go to New…
10 Questions on Reforming Furnace Control System
Reforming furnaces are special process furnaces used to generate pure hydrogen gas from a hydrocarbon feed gas, such as methane. The balanced chemical reaction for this process is as follows:…
Flowmeter Control Strategy
In this process, raw maple syrup is heated by steam to evaporate water and make it more concentrated. An analytical sugar-concentration analyzer at the end monitors the concentration of the…
Heat Exchanger Temperature Control
Since the outlet temperature of a heat exchanger can only change if there is an imbalance of inlet and outlet heat rates (assuming constant liquid inlet temperature and constant liquid…
Liquid Level Control using Flow Loop
Since liquid level can only change in a vessel if there is an imbalance of inlet and outlet flow rates, would this system be practical to achieve steady liquid level…
Paint Mixing System
This paint mixing system mixes (clear) base and (colored) pigment to achieve the desired coloring, according to the ratio setpoint: Paint Mixing System 1. Determine what will happen to the…
Wiring Diagrams of PLC and DCS Systems – DI, DO, AI, AO
PLC and DCS control systems Wiring Diagrams for Digital Input (DI), Digital Output (DO), Analog Input (AI), and Analog Output (AO) signals.
