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西门子plc 3pn/dp是什么意思

PN是代表PLC集成了PROFINET口，也可以说是以太网口。DP是代表PLC集成了PROFIBUS-DP口。3PN/DP是：X1:MPI/DPX2:DPX3:PN-IO两个端口2PN/DP是：X1:MPI/DPX2:PN-IO两个端口（PROFINETIO-Controller;supportsRT/IRT;PROF...

开发笔记 ·2024-09-29

西门子PLC中的数据如何寻址

S7-200的PLC按照寻址的范围有位寻址I0.0Q0.0M0.0S0.0SM0.0V0.0L0.0字节寻址IB0QB0MB0SMB0VB0LB0AC0字寻址IW0AIW0QW0AQW0VW0MW0LW0AC0双字寻址ID0AID0QD0AQD0VD0MD0LD0AC0S7-300的PLC按照寻址的范围有位寻址I0.0...

开发笔记 ·2024-04-29

西门子PLC数据类型

bool布尔量就是开关量只有0，1byte字节word字16位整数dword双字32位整数int带符号16位整数dint带符号32位整数real浮点数实数32位适配器就是plc和电脑的连接线例如MPI电缆　　以s7300为例：S7-300的数据类型分以下三种：基本数据类型、复合数据类型和参数类型。一、基本数据类型1、位...

开发笔记 ·2024-04-29

三菱plc 数据比较指令

1.比较类型数据比较指令主要包括等于、不等于、大于、小于、大于等于和小于等于等多种比较类型。这些比较类型可以根据实际需求进行选择，用于判断两个数据之间的关系。比较类型的选择需要根据具体的应用场景来确定，例如在温度控制系统中，可以使用大于和小于等比较类型来判断当前温度是否在设定范围内。数据比较指令的比较类型可以通过PLC...

开发笔记 ·2024-03-01

ORA-26942: LCR should not contain old value for column string in table string.string

文档解释ORA-26942:LCRshouldnotcontainoldvalueforcolumnstringintablestring.stringCause:TheLCRcontainedoldvaluesforLOB,XMLTypeandobjectcolumns.Action:Removeoldvaluesf...

IT技术学习 ·2023-07-28

ORA-26938: cannot pack LCR into LCR buffer (buffer size is string, LCR size is string)

文档解释ORA-26938:cannotpackLCRintoLCRbuffer(buffersizeisstring,LCRsizeisstring)Cause:Thelogicalchangerecord(LCR)bufferwasnotlargeenoughtostorethecurrentLCR.Action:...

IT技术学习 ·2023-07-25

ORA-09716: kslcll: Unable to fix in-flux lamport latch.

文档解释ORA-09716:kslcll:Unabletofixin-fluxlamportlatch.Cause:OneOracleprocessdiedwhilestillholdingalamportlatch.Action:Exit(kill)allOracleuserprocesses.Shutdown(ab...

IT技术学习 ·2023-07-25

ORA-07212: slcpu: times error, unable to get cpu time.

文档解释ORA-07212:slcpu:timeserror,unabletogetcputime.Cause:timessystemcallreturnedanerror.PossibleOSerror.Action:Checkadditionalinformationreturned.Contactcustomer...

IT技术学习 ·2023-07-23

ORA-07270: spalck: setitimer error, unable to set interval timer.

文档解释ORA-07270:spalck:setitimererror,unabletosetintervaltimer.Cause:Anerroroccurredwhiletryingtosetanintervaltimer.Probableportingproblem.Action:Checkerrno.ORA-0...

IT技术学习 ·2023-07-22

ORA-07210: slcpu: getrusage error, unable to get cpu time.

文档解释ORA-07210:slcpu:getrusageerror,unabletogetcputime.Cause:Getrusagesystemcallreturnedanerror.PossibleOSerror.Action:Checkadditionalinformationreturned.Contact...

IT技术学习 ·2023-07-19

ORA-26893: Input LCR must be a commit LCR

文档解释ORA-26893:InputLCRmustbeacommitLCRCause:TheinputLCRwasnotacommitLCR.Action:MakesuretheinputLCRisacommitLCR.ORA-26893：LCR必须是提交LCR官方解释错误消息ORA-26893表明提供程序的输入参数...

IT技术学习 ·2023-07-19

ORA-26915: Unable to return Logical Change Record (LCR) information due to missing data dictionary.

文档解释ORA-26915:UnabletoreturnLogicalChangeRecord(LCR)informationduetomissingdatadictionary.Cause:Thecurrentsessionwasunabletoreturntherequestedinformationonthegi...

IT技术学习 ·2023-07-18

ORA-26679: operation not allowed on LOB or LONG columns in LCR

文档解释ORA-26679:operationnotallowedonLOBorLONGcolumnsinLCRCause:CertainoperationsonLOB/LONGcolumnsoftheLCRthroughrule-basedtransformations,DMLhandlers,orerrorhand...

IT技术学习 ·2023-07-17

ORA-26688: missing key in LCR

文档解释ORA-26688:missingkeyinLCRCause:Metadatamismatch,ornotenoughinformationintheusergeneratedLCR.Action:Alterthedatabaseobject,orprovidealldefinedkeysintheLCR.OR...

IT技术学习 ·2023-07-16

ORA-26904: Invalid bind variable “string” in LCR field expression.

文档解释ORA-26904:Invalidbindvariable“string”inLCRfieldexpression.Cause:Inthestatementhandler,thebindvariableslistedintheSQLexpressiondidnotmatchtheallo...

IT技术学习 ·2023-07-11