Much of the promise of Industry 4.0 is based upon seamless interconnectivity between production machines, enterprise systems and sources of data in the wider world. The Industrial Internet of Things (IIoT) is a key foundation of that interconnectivity through low cost, easily integrated sensors, actuators and systems.
Yet in most production environments today, true integration is rarely realized. Production networks need to communicate a variety of data, from critical real-time machine control signals to high volumes of recorded data from quality control systems and machine monitoring technologies. The differing technical requirements of these diverse data types can lead many organizations to implement multiple data networks. That adds complexity to system design, construction and maintenance. It makes data sharing across different types of equipment more challenging too.
To overcome these difficulties, manufacturers need a different kind of communication network. We at CC-Link believe that network is CC-Link IE, an open industrial network offering gigabit Ethernet performance.
CC-Link IE solves the first critical challenge facing the new generation of connected factories: bandwidth. At 1 Gbps, it offers performance up to 10 times that of similar protocols available today, enough to satisfy the most data-hungry modern manufacturing processes. The 1Gbps network is not all about the speed – but the data capacity allowed by the increased bandwidth; this provides for true Industry 4.0 capability.
CC-Link IE is based on standard IEEE 802.3 Ethernet, and offers flexibility in network design, including ring, line and star topologies. The line and star topologies can be combined to provide systems that offer the maximum application flexibility. The ring and line connections are also attractive, as they permit simple “daisy chaining” of devices, meaning the added cost and complexity of network switches can be avoided.
CC-Link IE also allows considerable application flexibility by supporting multiple protocol types on the same network. This reduces costs and increases maintainability. In addition to the standard I/O control, it offers safety (SIL3) and motion control on the same cable. This allows the CLPA to offer a cost-effective, simplified, flat network architecture that meets the needs of nearly all applications in the discrete sector.
The network uses commercially available Ethernet infrastructure, such as standard gigabit switches, Cat5E cable and RJ45 connectors. A single network can incorporate a total of 120 stations with up to 100 m of Cat5E cable between each station. As many as 239 networks can be interconnected. To further increase the network possibilities for end users and machine builders, CC-Link Partner Association has worked with PROFINET International (PI) to produce a specification for a “coupler” device that will allow these previously incompatible networks to be freely interoperable. Moreover, the CLPA is working with the OPC Foundation to develop support for OPC-UA with CC-Link IE.
Unlike industrial protocols built on the standard TCP/IP (UDP/IP) stack, CC-Link IE combines the physical and data-link layers of the OSI hierarchy with an open protocol that extends from the network to application layers. The result is inherent cybersecurity, thanks to an open, but controlled knowledge base that CLPA partners are free to implement, but reduces the exposure to unauthorized use.
Critically for applications that combine industrial automation with enterprise systems and cloud or internet-based technologies, CC-Link IE can encapsulate TCP/IP (UDP/IP) packets for transmission across the network, allowing this traffic to “tunnel” through the CC-Link IE system.