會在下一個掃描周期輸入掃描之前執(zhí)行此項操作。當(dāng)程序中的功能SVC_ REQ#26被使能時，系統(tǒng)試圖執(zhí)行角色轉(zhuǎn)換的工作。此功能被使用并不一定意味著–定將在下個掃描輸入之前就執(zhí)行角色轉(zhuǎn)換的工作。在前一個轉(zhuǎn)換后10秒鐘之內(nèi)的第二次轉(zhuǎn)換將不被執(zhí)行。這個10秒鐘的限制保證了當(dāng)兩兩個單元在幾乎同時都要求交換時交換只發(fā)生-次。這個parm參數(shù)將被SVC_ REQ#26功能忽略，但是程序軟件需要為parm參數(shù)提供入口?？梢栽诖溯斎肴魏巫兞浚斎氲闹挡粫皇褂?。

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