我廠一臺(tái)伺服設(shè)備運(yùn)動(dòng)時(shí)發(fā)生故障,使用的是QD75MH4 ,查看U806故障代碼是101,QD75M技術(shù)手冊上說是“PLC READY signal OFF during operation”,處理方法是“Review the PLC program which turns ON/OFF PLC READY signal (Y0).。問題是程序中沒有關(guān)掉plc ready信號,請問為什么會(huì)有101故障代碼,如何處理?