PLC

In the operation of a distillation column, temperature control plays a critical role in ensuring the separation and purity of the product. The original temperature control scheme, designed to use reflux control to regulate the top of the column temperature, has proven to be inadequate under certain operating conditions. Experience has shown that when the […]

Programmable Logic Controllers (PLCs) are essential components of industrial automation systems. A PLC is a specialized digital computer designed to control and monitor industrial processes and machinery. It is programmed to execute a sequence of operations, such as switching on/off devices, measuring variables like temperature or pressure, and communicating with other systems. Due to their

Introduction Distributed Control Systems (DCS) have become an indispensable technology in modern industrial automation, widely used in industries such as oil, chemicals, and power generation. As the demands for industrial automation continue to grow, the load capacity of DCS systems faces increasing challenges. To effectively meet large-scale control needs, relays, a simple yet efficient electrical

In today’s era of rapid industrial transformation, the construction of smart factories has become a widespread initiative across various industries. Many enterprises, particularly in the non-ferrous metal sector, are investing heavily in automation technologies and digitalization tools in pursuit of higher efficiency, productivity, and reduced reliance on manual operations. The prevailing belief is that the

When troubleshooting a 4-20mA loop disconnection, it is essential to follow a systematic approach. The following sections outline the primary diagnostic methods that instrument technicians should be familiar with: 1. Visual Inspection Inspect the Cables: Check the cables in the loop for any visible damage, fractures, aging, or corrosion. Pay particular attention to areas where

In many industrial applications, various non-electrical physical quantities such as temperature, humidity, pressure, speed, and angle need to be measured. A transmitter is the primary device used to convert these physical quantities into electrical signals for monitoring and control purposes. The most widely used method in industry to transmit analog signals is via a 4-20mA

In industrial applications, ensuring the stability and reliability of power supply to critical equipment is paramount. A Variable Frequency Drive (VFD) is one such crucial piece of equipment that controls the speed of electric motors by varying the frequency of the power supplied to them. The addition of an Uninterruptible Power Supply (UPS) in a

Introduction In the first half of this year, we implemented significant improvements in the sulfuric acid plant’s DCS (Distributed Control System). By optimizing control processes, we reduced operational events and alarms by over 90%. While this achievement is exciting, what inspires us even more is the innovative problem-solving applied within the DCS to achieve this

In control theory, the PID (Proportional-Integral-Derivative) controller is often considered the simplest and most effective control algorithm. For systems with a strong, single-variable cause-and-effect relationship, PID is not only straightforward but also highly efficient. The tuning of PID parameters is an essential skill for control engineers, and it remains the foundational knowledge for designing control

Introduction In a certain workshop, a PLC (Programmable Logic Controller) device, which had been running stably for some time, started experiencing frequent output failures. This malfunction caused the control of solenoid valves to fail, leading to a complete halt of the production line. Initially, maintenance electricians struggled to address the issue, unable to find a