如果有此類語句，這個功能塊將被拒絕執(zhí)行。因為PLC在執(zhí)行此操作時會發(fā)生不同步的現(xiàn)象，所以會在執(zhí)行SVC_ REQ#43命令時產(chǎn)生-一個錯誤日志。如果存在重要數(shù)據(jù)傳輸，不受這個功能塊的影響。可能在使能邏輯中用到SVC_REQ#43功能。-個帶有非傳輸變量的節(jié)點應該包含在此使能邏輯中。

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