發(fā)布時(shí)間:2018-06-13作者:德國(guó)倍福自動(dòng)化有限公司
1、Beckhoff耦合器 DP Cycle和K-bus cycle的同步
參考BK3xx0.chm -> PROFIBUS DP Communication -> Cyclic Data Exchange -> K-Bus Cycle
K-bus分為2種模式工作: FreeRun / Synchronous
● FreeRun (與DP Cycle無(wú)關(guān))
FreeRun又分為Slow和Fast兩種模式。
Slow FreeRun:It is a characteristic feature of the Slow FreeRun mode that the K-Bus cycle is called from the main task. Acyclic communication or events result in heavy jitter in the K-Bus cycle (KS2000, DPV1, terminal diagnosis, etc.), because all of these functions are also called from the main task.
Fast FreeRun:The K-Bus cycle is called under time control from a high priority task. Following completion of the K-Bus cycle, the lower priority tasks (DPV1, KS2000 interface, etc.).
如圖,與slow freerun模式相比,fast的k-bus執(zhí)行有更為固定的循環(huán)周期。
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