Logix5000 Controllers General Instructions - SLAC Confluence

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234 Compare <strong>Instructions</strong> (CMP, EQU, GEQ, GRT, LEQ, LES, LIM, MEQ, NEQ)Signed integers “roll over” from the maximum positive number to themaximum negative number when the most significant bit is set. Forexample, in 16-bit integers (INT type), the maximum positive integeris 32,767, which is represented in hexadecimal as 16#7FFF(bits 0 through 14 are all set). If you increment that number by one,the result is 16#8000 (bit 15 is set). For signed integers,hexadecimal 16#8000 is equal to -32,768 decimal. Incrementing fromthis point on until all 16 bits are set ends up at 16#FFFF, which isequal to -1 decimal.Low Limit ≤ High LimitThis can be shown as a circular number line (see the followingdiagrams). The LIM instruction starts at the Low Limit and incrementsclockwise until it reaches the High Limit. Any Test value in theclockwise range from the Low Limit to the High Limit sets therung-condition-out to true. Any Test value in the clockwise range fromthe High Limit to the Low Limit sets the rung-condition-out to false.Low Limit ≥ High LimitThe instruction is true if the test value is equal to or between the low and high limitThe instruction is true if the test value is equal to or outside the low andhigh limit−10+1−10+1low limithigh limithigh limitlow limit−(n+1) +nn = maximum value−(n+1) +nn = maximum valueArithmetic Status Flags:Fault Conditions:not affectednonePublication 1756-RM003I-EN-P - January 2007
Compare <strong>Instructions</strong> (CMP, EQU, GEQ, GRT, LEQ, LES, LIM, MEQ, NEQ) 235Execution:Relay LadderConditionprescanrung-condition-in is falserung-condition-in is trueActionThe rung-condition-out is set to false.The rung-condition-out is set to false.evaluate limitcomparison is truerung-condition-out is setto truecomparison is falserung-condition-out is setto falseendpostscanThe 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 does nothing, and the outputs are not updated.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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Page 184 and 185: 184 Input/Output Instructions (MSG,
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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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522 Trigonometric Instructions (SIN
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546 Advanced Math Instructions (LN,
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556 Math Conversion Instructions (D
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572 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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