Compare Modbus, Fieldbus, and Profibus
Modbus is a granddaddy of industrial communication protocols. Modbus is Modicon plus fieldbus. Modbus, a serial communication protocol developed by Modicon in 1979. It is developed by Modicon for PLC...
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Category : Control Systems
We have the largest collection of Industrial Control Systems articles like industrial automation, Distributed Control Systems (DCS).
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...
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...
Wiring Diagrams of PLC and DCS Systems – DI, DO, AI, AO
In this article, we are sharing the basic concepts of PLC and DCS control systems Wiring Diagrams for Digital Input (DI), Digital Output (DO), Analog Input (AI), and Analog Output...
How to Implement Ratio Control in this System?
A variety of chemicals are added to raw water when treating it for human consumption, and also when treating water for many industrial processes. In the coagulation stage, chemicals are...
Questions on Ratio Control System
A byproduct of the kraft process used in the paper industry for turning wood chips into pulp is a liquid called black liquor. This liquid contains many volatile sulfur compounds...
Fault in the Temperature Loop
An operator tells you the stack temperature of this incinerator is running high as indicated by TIC-37. The setpoint is set at 1400 degrees F, but the PV display shows...
Temperature Controller Problem
Suppose a chemical reactor is heated by steam. A temperature controller varies the amount of steam admitted to a “jacket” surrounding the reactor: Temperature Controller Problem Ever since this process...