Power over Cable:整合数据传输与供电,单一缆线解决工业视觉应用的需求

Power over Cable: Single Cable Solution in Industrial Vision Application

所有的工业机器视觉设备都需要依赖图像数据传输与电源供应,而且大多数的工业相机都需要使用两条缆线,一条用于传输数据,另一条则是电源线,这意味着使用者必须多花一倍安装与维护缆线的成本,同时缆线故障的机率也增加一倍。随着工业机器视觉市场从模拟跨入数字相机后,如何通过"Power over Cable"供电型接口简化安装、节省空间以及降低成本,成为工业机器视觉应用中最新的话题。

All industrial vision appliances require both image data and a power supply, and most of the industrial cameras require two cables-one for image data transmission and the other for power. Two cables mean double the installing and maintaining wiring cost, and two times the opportunitv for failure. In the early years, analog cameras almost dominated the industrial vision market; however one of the shortcomings associated with analog cameras is electromagnetic interference, or EMI. Although analog cameras use a shielded coaxial cable for signal transport, EMI can still adversely affect the 1 volt, peakto-peak video signal contained within it. Thus, the combination of power, and image data into a single cable was not the mainstream. Technological advances such at the introduction of digital camera standards that use Camera Link,FireWire, and Gigabit Ethernet eliminate this issue as data transmission in digital camera exists in only two voltage states, and therefore is not as susceptible to EMI as analog is. After the move from analog to digital cameras, the focus in the industrial vision market became simplifying installations, reducing space, and reducing costs.