PROFIBUS Manual

CSRD: Cyclic Send and Request Data

CSRD: Cyclic Send and Request Data

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CSRD: Cyclic Send and Request Data

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In the earliest definitions of PROFIBUS, a cyclic service was still defined. However, today this service is practically never used any more. With an CSRD service, the communications system as initiator independently polls a responder. This generates great loads on the bus that are difficult to calculate.