PLC

In industrial operations, safety is like a sword of Damocles hanging overhead — any negligence could trigger catastrophic consequences. One key defense mechanism widely adopted across industries is SIL, or Safety Integrity Level. But what exactly is SIL, and why is it so crucial? This article offers a detailed exploration of SIL’s definition, standards, applications, […]

DCS, or Distributed Control System, is also referred to as a decentralized control system in China’s automation industry. A DCS is a modern control system based on microprocessors. It distributes control in a decentralized manner, focusing on hazard control while centralizing operations and management. This advanced system integrates computer technology, communication technology, CRT (display) technology,

In the world of industrial automation, Programmable Logic Controllers (PLCs) play a vital role in managing real-time operations. One of the most essential yet often overlooked aspects of PLC operation is the scan cycle. Understanding how the PLC scan cycle works can help engineers optimize system performance and ensure reliable, predictable control. 🔄 What Is

Pneumatic systems are widely used in various industries for automation and process control due to their reliability, simplicity, and efficiency. To ensure the optimal performance of these systems, it’s important to condition the air used to drive pneumatic actuators and other devices. This is where FRL units (Filter-Regulator-Lubricator) come into play. The two most common

In programmable logic controller (PLC) applications, discrete logic control refers to the processing of binary signals—on/off, true/false—based on specific logical relationships. This document outlines three commonly used programming approaches: Basic Logic Design, Advanced Logic Design, and Engineering Design Methods. 1. Basic Logic Design Method The basic logic design method uses simple logic operations (AND, OR,

In automatic control systems, achieving bumpless transfer is crucial. Bumpless transfer refers to the ability to switch between manual and automatic modes without introducing any disturbances into the process. Typically, switching from automatic to manual mode is straightforward. However, switching from manual to automatic mode is more complex and demands careful design. 1. Bumpless Transfer

1. Introduction In industrial process control, disturbances such as sudden changes in input or load conditions can significantly affect system stability. While PID controllers are widely used for maintaining process setpoints, combining them with feedforward control can enhance responsiveness and reduce output fluctuations. This paper discusses how feedforward and PID control can work together, using

Overview Safety Instrumented Systems (SIS) are the final line of defense in chemical and process industries. They protect personnel, equipment, and the environment from hazardous events by automatically transitioning processes into safe states under abnormal conditions such as overpressure, overtemperature, or high level alarms. However, interlocks can fail due to various reasons, often resulting in

This document outlines practical approaches for daily maintenance and troubleshooting of Distributed Control Systems (DCS), with a focus on power systems, network communications, and software-related issues. 1. Power Supply System DCS systems commonly adopt dual-redundant hot-swappable power supplies. Although DCS systems are generally stable during normal operations, faults—typically single-line power losses—can still occur. Prompt troubleshooting

Programmable Logic Controllers (PLCs) are widely used in industrial automation for their flexibility, reliability, and scalability. Based on their physical structure and configuration, PLCs can be generally classified into three types: Compact (Box-Type) Modular Embedded (Insert Board-Type) Each type has distinct design features, advantages, and typical applications, which are outlined below. 1. Compact (Box-Type) PLC