In vision systems, the trigger photography method of industrial cameras is a crucial technical aspect. Many might wonder whether these cameras continuously shoot or if they have specific control mechanisms. Today, we delve into the triggering methods of industrial cameras and how they operate.
Industrial cameras generally employ two types of triggers: hard triggers and soft triggers. Starting with hard triggers, they are typically activated by a photoelectric switch that sends a voltage signal to the camera upon detecting a product. For example, when a 4-volt motor reaches a certain position, a PLC (Programmable Logic Controller) determines and sends a voltage signal. Industrial cameras come equipped with such trigger interfaces, supporting both high and low voltage levels. In mainstream industrial camera brands, this signal can be set to modes like rising edge, falling edge, or continuous shooting. In most applications, hard triggering is used for its simplicity and ease of operation.
Next, we have soft triggers. Soft triggering is done through a higher-level computer that sends a string command to the vision system. Upon receiving this command, the camera begins its shooting process. The advantage of soft triggers lies in their flexibility, especially in complex programs requiring frequent template switching, allowing for dynamic program changes based on the received instructions.
Finally, returning to our initial question: generally, vision systems do not continuously photograph, as this increases the system's CPU load and can lead to errors. Therefore, cameras are typically triggered to shoot each time a product is correctly positioned. This method allows for more effective control of the shooting timing, ensuring the stability and accuracy of the system. This article aims to enhance your understanding of the trigger photography methods of industrial cameras in vision systems.
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