Direct communication across all device levels including cross communications between drives or controllers makes sercos the ideal choice for distributed intelligence and full real-time performance. Indirect communication between slaves which is routed through the master would pose a risk for synchronous motion, for example on gantry axes, or increase response times.
Using CC cross communication, sercos slaves can communicate with each other directly with no delay, providing the basis for unrestricted real-time communication and intelligent automation configurations. The same principle applies to C2C communication between controllers.
sercos devices use internal clocks to synchronize signal execution all across the network. This compensates for minimal timing deviations. Due to the physical characteristics, it takes a certain amount of time for a data message to reach a node.
In contrast to conventional Ethernet bus systems, sercos uses internal clocks to synchronize the exact execution time. The receipt of the first MDT in the cycle is used to synchronize these clocks with the master clock. As a result, exact synchronization can be achieved without the need for timing data for distributed clocks which would degrade performance.

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Peter Lutz
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