PLC

IntroductionIn the world of industrial automation, SCADA and HMI are two frequently mentioned terms. While they are closely related, they serve different purposes and operate at different levels of the automation hierarchy. Whether you’re setting up a new process system or upgrading your existing plant, understanding the difference between SCADA and HMI can help you […]

In industrial automation, transmitting accurate and reliable signals over long distances is critical for process control. One of the most widely used standards for analog signal transmission is the 4-20mA current loop. This article explores the reasons behind its popularity and effectiveness in industrial environments. 1. Strong Noise Immunity In industrial environments, electrical noise and

Advanced Process Control (APC) is a powerful technology that can significantly optimize industrial processes and improve efficiency. However, many enterprises, particularly in China, find themselves trapped in disappointing cycles of poor outcomes despite investing substantially in APC initiatives. The root of this issue lies in a fundamental mismatch between the enterprises (clients) and the APC

Digital and analog signals are commonly encountered in industrial automation and control systems. They differ significantly in terms of signal characteristics, application scenarios, and processing methods. This article offers a detailed analysis of these two types of signals. 1. Basic Concepts 1.1 Digital Signal (Switching Signal) A digital signal is a discrete signal that has

When designing control systems, selecting the appropriate control law—Proportional (P), Proportional-Integral (PI), or Proportional-Integral-Derivative (PID)—is crucial for achieving the desired performance. Each type of control law has specific characteristics and suitability criteria. 1. Proportional Control (P Control) Characteristics: Fast Response: Provides an immediate control action proportional to the current error. Steady-state Error: Typically unable to

Distributed Control Systems (DCS) are widely used in industrial automation to monitor and control processes. This document explains the reasons for integrating relays with Digital Input (DI) and Digital Output (DO) points and safety barriers with Analog Input (AI) channels in DCS systems. The purpose is to enhance system reliability, ensure signal integrity, and meet

In the field of industrial automation, Distributed Control Systems (DCS) and Programmable Logic Controllers (PLC) are two widely adopted control solutions. While they may appear similar at first glance, their design philosophies, applications, and technical characteristics differ significantly. Understanding these differences is essential for making the right selection in any industrial project. This article analyzes

1. What are the main methods to reduce instrument alarms? Reduce failures in field instruments and systems, handle failures promptly, and carry out preventive maintenance and reliability improvements. Optimize signal processing and control loops, filter I/O signals, and set signal thresholds, dead zones, PID parameter tuning, and control strategy optimization. Enhance the system’s automatic control

In the field of control theory, it is common to propose new algorithms and compare their performance with that of classical PID controllers. However, during the writing and review process of many research papers, it has been observed that the experimental design of PID comparison often has noticeable flaws, making it difficult to fully validate

In modern industrial systems, the concepts of “hard circuits” and “soft circuits” (or “hard wiring” and “soft wiring”) are commonly used to describe different methods of implementing logic control and protection functionalities. Understanding these distinctions is crucial for system design, operation, and maintenance. Below is a detailed explanation of their definitions, characteristics, and applications. 1.