CC-Link IE | missing link in Industry 4.0 and IIot communications
CC-Link IE|the missing link in Industry 4.0 and IIot communications.
Much of the promise of Industry 4.0 (4IR) 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, providing low cost, easily integrated sensors, actuators and systems.
Yet in most production environments today, true integration is rarely realised. In a recent survey by Cisco of 1,845 IT and business decision-makers in the United States, UK, and India across a manufacturing and commerce, almost three-quarters of IoT projects are failing.
Production networks need to communicate a wide variety of different data types, 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 organisations 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.
The first Gigabit IIoT network
To overcome these difficulties, manufacturers need a different kind of communication network. That network is now becoming a reality, thanks to CC-Link IE, the first open industrial network offering gigabit Ethernet performance. CC-Link IE solves the first critical challenge facing the new generation of connected factories: bandwidth. At 1Gbps, it offers performance up to 10 times that of similar protocols available today, enough to satisfy the most data-hungry modern manufacturing processes.
Based on standard IEEE 802.3 Ethernet, CC-Link IE offers great 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.
I/O, safety and motion on one cable
It 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 also 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 100m of Cat5E cable between each station. In addition, as many as 239 networks can be interconnected.
To simplify integration into existing networks, the CC-Link Partner Association worked with PROFIBUS and PROFINET International (PI) on a “coupler” device that will allow these previously incompatible networks to be freely interoperable. Moreover, the CLPA is also 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 improved cybersecurity, thanks to an open, but controlled knowledge base that CLPA partners are free to implement, but reduces the exposure to unauthorised 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.
CC-Link IE’s basic communication technique is based on a shared memory model. All the devices on the network occupy an area of the controller’s memory. To communicate with them, it’s only necessary to change the value of the data in the area corresponding to the relevant device. The network automatically handles the traffic via the standard “cyclic” (synchronous) communication.
Deterministic performance is achieved with a token passing method, allowing dependable system operation. In practice, this allows network update times to occur in a few tens of microseconds, depending on system size and configuration. CC-Link IE also offers the ability for redundant controllers, so even a controller failure will not necessarily result in lost production.
CC-Link IE offers manufacturers the benefits of greater connectivity across their sites, improved network performance, high-speed data through, deterministic performance and inherent security. It is ready to deliver IIot and Industry 4.0.
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