The Meanings of "normally open" and "normally closed" in the Safety Light Curtain

1. Output type of normally open safety light curtain: The output type of normally open means that when the safety light curtain works normally, its output signal remains in the normally open state, that is, the on-off device is in the open state. When an object blocks the beam, the output signal changes and switches to the normally closed state, and the on-off device is closed. The advantages of the normally open output type include: - High safety: The normally open output type has higher safety in the event of a fault or power failure, as blocking the beam does not cause the system to fail. - Higher tolerance: For transient, non-faulty obstructions, the normally open output type can tolerate without immediately causing downtime. 2. Output type of normally closed safety light curtain: The output type of normally closed means that when the safety light curtain works normally, its output signal remains in the normally closed state, that is, the on-off device is in the closed state. When an object blocks the beam, the output signal changes and switches to the normally open state, and the on-off device is turned on. The advantages of the normally closed output type include: - Fast response: The normally closed output type has a very fast response to the obstruction of the object, which can trigger the shutdown response in a timely manner to ensure the safety of workers and equipment. - Easy integration with existing systems: The normally closed output type is usually compatible with most control systems and equipment, and is more easily integrated into existing systems. 3. Selection of output types of safety light curtain: The selection of suitable output types depends on specific application requirements and safety requirements. The following aspects are worthy of consideration: - Safety requirements: If it is required to ensure the effectiveness of the safety light curtain in the event of system failure, the normally open output type may be more suitable. - Speed and sensitivity requirements: If a fast response and high sensitivity safety light curtain is required, the normally closed output type may be more appropriate. - System integration: Select the output type based on the requirements and compatibility of the existing system to achieve easier and smoother integration. The selection of the output type of the safety light curtain needs to be based on specific application requirements and safety requirements. The normally open output type has the advantage of safety and tolerance, and is suitable for cases with higher fault tolerance requirements. The normally closed output type has the advantage of fast response and system integration, and is suitable for applications that require fast response and integration with the existing system. Selecting the appropriate output type helps to ensure the effectiveness and reliability of the safety light curtain in industrial applications.