Message transmission in CC-Link networks

by The CC-Link Team on 13 October 2010

CC-Link networks offer very high levels of determinism, essential in most applications in order to ensure performance, productivity and correct system function. This is provided in two ways.

Cyclic communication provides real-time deterministic performance via a token passing method. The majority of data being shared throughout a system is handled in this way in order to insure dependable performance. This is achieved by using dedicated bandwidth to prevent other communications from interfering with essential control signals and data. In this way, even significant quantities of data can be reliably shared amongst large numbers of stations in real time, with each receiving the signals and data it needs precisely when required.

To complement this, transient communication provides an asynchronous or non-cyclic method for stations to communicate directly with each other on an ad-hoc basis. Separate to normal cyclic control signals and data, this provides further dedicated bandwidth for infrequent communications. Hence data without a set cycle, such as alarms, can easily be handled without impacting system performance.

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