PLC

In industrial process control and safety systems, proper configuration of alarm and interlock setpoints is crucial for ensuring operational safety, equipment protection, and efficient production. A common design principle is that alarm setpoints should be set lower than interlock setpoints to provide early warning before automatic protective actions occur. However, is it always unreasonable for […]

In complex and precise industrial system architectures, Safety Integrity (SI) serves as the cornerstone for safeguarding personnel, assets, and the environment. The concept of “failure” within this context is a critical node that demands comprehensive and in-depth understanding. Accurate identification and detailed classification of failures not only facilitate the stable operation of systems but also

Abstract Supervisory Control and Data Acquisition (SCADA) systems have evolved significantly over the past few decades. Initially serving as basic data collection tools, they have transformed into modern platforms with advanced analytical and integration capabilities. With the rise of the Industrial Internet of Things (IIoT) in the last 20 years, SCADA technology has rapidly advanced

Emergency stop buttons (E-stop buttons) are critical safety features on industrial and commercial equipment. Their purpose is to immediately stop a machine or process during an emergency to protect personnel, equipment, and the surrounding environment. However, there is often debate regarding whether the protective cover of such buttons should be locked or sealed. This article

Boiler drum level transmitters play a critical role in maintaining the safe and efficient operation of a boiler system. These instruments measure the differential pressure across the water and steam sides of the drum to determine the water level. Depending on the installation orientation of the transmitter, forward or reverse, the signal interpretation in the

Introduction In industrial automation, safety and process control are managed by distinct systems designed for different purposes: the Distributed Control System (DCS) and the Safety Instrumented System (SIS). Understanding whether safety interlocks can be implemented through DCS requires a deep dive into their fundamental differences, capabilities, and safety standards. 1. Distinction Between DCS and SIS

Introduction In petrochemical production processes, the Safety Instrumented System (SIS) interlock logic is a crucial safety measure ensuring the safe operation of industrial processes. Various SIS interlock configurations, such as 1-out-of-1 (1oo1), 2-out-of-2 (2oo2), 2-out-of-1 (2oo1), and 3-out-of-2 (3oo2), are commonly used. Recently, a new configuration, 4-out-of-4 (4oo4), has been proposed. This article explores the

In a recent industrial installation, the reboilers of a distillation column were configured to use steam pressure control. However, concerns were raised regarding the stability of incoming steam pressure, leading to the suggestion of switching to flow control. This proposal included the addition of a steam flowmeter and updating the control scheme. Since this involves

In the realm of industrial automation and control systems, two key components often come into focus: SCADA (Supervisory Control and Data Acquisition) and HMI (Human-Machine Interface). While these systems are interconnected and sometimes overlap in functionality, they serve distinct purposes within industrial operations. Understanding their differences is essential for implementing efficient and effective control systems.

Introduction An Emergency Stop (E-Stop) is a critical safety mechanism in programmable logic controller (PLC) systems. It halts ongoing actions by disconnecting the control circuit via relays or contactors. E-Stops are indispensable in industrial automation, ensuring equipment and personnel safety during emergencies. This article explores the concept, application, and best practices of using E-Stops in