【2025 Fun Fact】 The difference between “chain” and “interlock”

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The last edit to this post was made by zhoudingshengs on 2025-1-17 09:09. The difference between “chain” and “interlock”. I. Overview 1. Chain A chain refers to the use of electrical signals to connect different devices and components, thereby creating a certain degree of mutual restraint among them. It is primarily used to control the sequence of actions between devices or between devices and systems, enabling coordinated control among devices and components and ensuring that operations proceed in a specific order. 2. Interlocking: Interlocking refers to the relationship between the operations of adjacent devices; a change in the state of one device affects another device. It is primarily used to prevent the same mechanism from performing adjustment actions repeatedly, to avoid interference by that same mechanism on other mechanisms that are related in some way, to ensure the proper functioning of various safety protection functions, and to prevent human errors. II. The relationship between them: The relationship between interlocking and chaining can be understood from both electrical and mechanical perspectives. In electrical engineering terminology, interlocking generally refers to the mutual restraint between devices achieved through the contacts of electrical or mechanical components, used to ensure that devices operate in the prescribed sequence or to prevent incorrect operations. In fire protection systems, interlocking generally refers to control that does not require the involvement of a fire alarm system; that is, when a certain device or system reaches a specific condition, it directly triggers another device to take action. Both interlocking and sequencing involve control methods for the interaction between devices, achieved through certain mechanisms. In practical applications, these two terms can sometimes be used interchangeably, but there are still some subtle differences between them in specific standards and specifications. For example: in some electrical and fire safety codes, interlocking usually refers to more specific electrical or mechanical interconnections, whereas chaining may involve a broader range of control logic. III. Implementation Methods The main implementation methods for interlocks are mechanical contact-type interlocks and electronic interlocks. Mechanical contact-type interlocking operates through mechanical contact, offering advantages such as reliable operation, low cost, and minimal electromagnetic interference ； Electronic interlocking achieves signal interconnection through logic circuits and digital circuits, offering the advantages of a wide range of applications and high stability. The main methods of implementing interlocking are mechanical interlocking and electrical interlocking. Mechanical interlocking achieves interlocking between states through mechanical interlocking mechanisms, and features high reliability and good stability ； Electrical interlocking achieves interlocking between states through electrical signals, featuring fast response and convenient operation.