Safety services on a standard network

摘要

CIP safety extends the industry standard common industrial protocol (CIP) base services by adding CIP Safety distinctive services to transport data for CIP based networks such as EtherNet/IP with high integrity. It can offer a scalable, network independent approach to safety networking, where the safety services are described in a well-defined layer, allowing the underlying network services to be changed. This approach is said to enable the seamless routing of safety data, allowing users to create end to end safety chains across multiple links. The same motivations that originally moved communication networks into the industrial environment - greater distances, increased flexibility, reduced cost, and improved maintainability - are also driving the development of industrial safety networks. End users recognize the limitations of traditional hardwired safety solutions as hardwired systems are difficult to develop and maintain for all but the most basic applications. For example, hardwired safety systems employ relays, which are interconnected to provide a safety function. Furthermore, these systems place significant restrictions on the distance between devices.