描述
當順控程序被Abort時,順控程序先執(zhí)行當前激活步,之后再執(zhí)行END步。然后SFCchart處理滿足啟動條件的順控程序。
如果觸發(fā)Abort命令時當前SFCchart中有處于“Held”狀態(tài)的順控程序,則SFCchart會先處理正在運行的順控程序(先執(zhí)行當前步,再執(zhí)行END步),之后處理處于“Held”的順控程序(先執(zhí)行Held步,再執(zhí)行END步)。然后才處理滿足啟動條件的順控程序。
如下圖1所示的SFCchart包含三個順控程序RUN_KM,ABORT_KM,HOLD_KM,啟動條件分別為SFCchart處于“Run”,“Aborting”,“Holding”狀態(tài)。在SFCchart處于“Run”狀態(tài)時,順控程序RUN_KM會執(zhí)行,Hold命令將SFCchart轉(zhuǎn)入“Holding”狀態(tài)(RUNHOLD=hold),此時順控程序RUN_KM會暫停而去執(zhí)行HOLD_KM的順控程序。
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