Logix5000 Controllers General Instructions - SLAC Confluence

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116 Timer and Counter <strong>Instructions</strong> (TON, TOF, RTO, TONR, TOFR, RTOR, CTU, CTD, CTUD, RES)After it updates the ACC, the timer sets last_time_scanned =current_time. This gets the timer ready for the next scan.IMPORTANTMake sure to scan the timer at least every 69 minutes while it runs. Otherwise, the ACC valuewon’t be correct.The last_time_scanned value has a range of up to 69 minutes. The timer’s calculationrolls over if you don’t scan the timer within 69 minutes. The ACC value won’t be correct if thishappens.While a timer runs, scan it within 69 minutes if you put it in a:• subroutine• section of code that is between JMP and LBL instructions• sequential function chart (SFC)• event or periodic task• state routine of a phaseArithmetic Status Flags:Fault Conditions:not affectednoneExecution:Condition Function Block Action Structured Text Actionprescan No action taken. No action taken.instruction first scan EN, TT and DN are cleared.EN, TT and DN are cleared.instruction first runEnableIn is clearedEnableIn is setACC value is set to PRE.EN, TT and DN are cleared.ACC value is set to PRE.EnableOut is cleared, the instruction does nothing,and the outputs are not updated.When EnableIn transitions from cleared to set, theinstruction initializes as described for instructionfirst scan.The instruction executes.ACC value is set to PRE.EN, TT and DN are cleared.ACC value is set to PRE.naEnableIn is always set.The instruction executes.resetEnableOut is set.When the Reset input parameter is set, theinstruction clears EN, TT and DN and setsACC = PRE. Note that this is different than using aRES instruction on a TOF instruction.postscan No action taken. No action taken.When the Reset input parameter is set, theinstruction clears EN, TT and DN and setsACC = PRE. Note that this is different than using aRES instruction on a TOF instruction.Publication 1756-RM003I-EN-P - January 2007
Timer and Counter <strong>Instructions</strong> (TON, TOF, RTO, TONR, TOFR, RTOR, CTU, CTD, CTUD, RES) 117Example:Each scan after limit_switch1 is cleared, the TOFR instructionincrements the ACC value by elapsed time until the ACC value reachesthe PRE value. When ACC ≥ PRE, the DN parameter is cleared, andtimer_state2 is set.Structured TextTOFR_01.Preset := 500TOFR_01.Reset := reset;TOFR_O1.TimerEnable := limit_switch1;TOFR(TOFR_01);timer_state2 := TOFR_01.DN;Function BlockPublication 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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166 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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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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Logix5000 Controllers General Instructions - SLAC Confluence

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