Logix5000 Controllers General Instructions - SLAC Confluence

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546 Advanced Math <strong>Instructions</strong> (LN, LOG, XPY)Natural Log (LN)The LN instruction takes the natural log of the Source and stores theresult in the Destination.Operands:Relay LadderOperand Type Format DescriptionSource SINT immediate find the natural log of this valueINTtagDINTREALDestinationSINTtagtag to store the resultINTDINTREALStructured Textdest := LN(source);Use LN as a function. This function computes the natural log of sourceand stores the result in dest.See Appendix B for information on the syntax of expressions withinstructured text.Function BlockOperand Type Format DescriptionLN tag FBD_MATH_ADVANCED structure LN structureFBD_MATH_ADVANCED StructureInput Parameter Data Type DescriptionEnableIn BOOL Enable input. If cleared, the instruction does not execute and outputs are not updated.Default is set.Source REAL Input to math instruction.Valid = any floatOutput Parameter Data Type DescriptionEnableOut BOOL The instruction produced a valid result.Publication 1756-RM003I-EN-P - January 2007
Advanced Math <strong>Instructions</strong> (LN, LOG, XPY) 547Description:Arithmetic Status Flags:Fault Conditions:The Source must be greater than zero, otherwise the overflow statusbit (S:V) is set. The resulting Destination is greater than or equal to-87.33655 and less than or equal to 88.72284.Arithmetic status flags are affected.noneExecution:Relay LadderConditionprescanrung-condition-in is falserung-condition-in is truepostscanActionThe rung-condition-out is set to false.The rung-condition-out is set to false.The controller calculates the natural log of the Source and places the result inthe Destination.The rung-condition-out is set to true.The rung-condition-out is set to false.Function BlockConditionprescaninstruction first scaninstruction first runEnableIn is clearedEnableIn is setpostscanActionNo action taken.No action taken.No action taken.EnableOut is cleared.The instruction executes.EnableOut is set.No action taken.Publication 1756-RM003I-EN-P - January 2007
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Logix5000Controllers GeneralInstruc
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Table of ContentsSummary of Changes
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Table of Contents 7Extended Error C
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Table of Contents 9Array (File)/Mis
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Table of Contents 11Set the deadban
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14 Table of ContentsPublication 175
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16 Summary of ChangesNotes:Publicat
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18 PrefacePurpose of This ManualThi
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20 PrefaceRelay ladder rung conditi
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22 PrefaceNotes:Publication 1756-RM
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24 Instruction LocatorInstruction:
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30 Instruction LocatorPublication 1
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32 Digital Alarm Instruction (ALMD)
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48 Analog Alarm Instruction (ALMA)A
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50 Analog Alarm Instruction (ALMA)S
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52 Analog Alarm Instruction (ALMA)I
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54 Analog Alarm Instruction (ALMA)I
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56 Analog Alarm Instruction (ALMA)O
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62 Analog Alarm Instruction (ALMA)E
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64 Analog Alarm Instruction (ALMA)E
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70 Bit Instructions (XIC, XIO, OTE,
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96 Timer and Counter Instructions (
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98 Timer and Counter Instructions (
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100 Timer and Counter Instructions
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140 Input/Output Instructions (MSG,
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206 Compare Instructions (CMP, EQU,
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248 Compute/Math Instructions (CPT,
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284 Move/Logical Instructions (MOV,
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332 Array (File)/Misc. Instructions
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388 Array (File)/Shift Instructions
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422 Sequencer Instructions (SQI, SQ
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436 Program Control Instructions (J
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472 For/Break Instructions (FOR, FO
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480 Special Instructions (FBC, DDT,
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Page 496 and 497: 496 Special Instructions (FBC, DDT,
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596 ASCII Serial Port Instructions
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606 ASCII String Instructions (CONC
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620 ASCII Conversion Instructions (
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636 Common AttributesInstructions e
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638 Common AttributesIf you use a S
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640 Common AttributesREAL to an int
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642 Function Block AttributesUse th
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644 Function Block AttributesOrder
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646 Function Block AttributesDo not
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648 Function Block AttributesCreate
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650 Function Block AttributesTiming
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652 Function Block AttributesCommon
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654 Function Block AttributesOvervi
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656 Function Block AttributesThe Pr
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658 Function Block AttributesProgra
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660 Structured Text ProgrammingTerm
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662 Structured Text ProgrammingThe
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664 Structured Text ProgrammingIn s
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666 Structured Text ProgrammingFor
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668 Structured Text ProgrammingUse
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670 Structured Text ProgrammingInst
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672 Structured Text ProgrammingIF..
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674 Structured Text ProgrammingExam
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676 Structured Text Programmingopti
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678 Structured Text ProgrammingFOR
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682 Structured Text ProgrammingThe
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684 Structured Text ProgrammingREPE
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688 Structured Text ProgrammingFor
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IndexAABL instruction 575ABS instru
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Index 693DEG 556FRD 565introduction
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Index 695sequencer 421serial port 5
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Index 697program/operator controlov
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Index 699timer on delay with reset
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Pub. Title/Type Logix5000 Controlle
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Rockwell AutomationSupportRockwell
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