What is cyclic communication?

by The CC-Link Team on 2 March 2011

One of the key features of the CC-Link IE controller network is the use of cyclic communication, which provides both system flexibility and ease of application for the user. This cyclic communication is central to enabling co-ordinated control between the controllers in the network for processes that need deterministic synchronised action.

But how does it work?

In a CC-Link IE controller network, cyclic communication refreshes the control data among all stations on the network at a constant transmission rate by using shared network memory. This shared memory allows up to 4Kbyte of bit-oriented data and up to 256Kbyte of word-oriented data to be shared simultaneously between all the network stations. Each station on the network has its own area of shared memory to which it can write, but each station has access to all data from every station on the network.

Because the CC-Link IE controller network runs at 1Gbit/s, all the stations in the network can be refreshed particularly quickly. For example, a network of 32 stations can be refreshed with 4Kbyte of data in just 60 microseconds.

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