Logix5000 Controllers General Instructions - SLAC Confluence

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126 Timer and Counter <strong>Instructions</strong> (TON, TOF, RTO, TONR, TOFR, RTOR, CTU, CTD, CTUD, RES)Example:After limit_switch_1 goes from disabled to enabled 10 times, the .DNbit is set and light_1 turns on. If limit_switch_1 continues to go fromdisabled to enabled, counter_1 continues to increment its count andthe .DN bit remains set. When limit_switch_2 is enabled, the RESinstruction resets counter_1 (clears the status bits and the .ACC value)and light_1 turns off.Publication 1756-RM003I-EN-P - January 2007
Timer and Counter <strong>Instructions</strong> (TON, TOF, RTO, TONR, TOFR, RTOR, CTU, CTD, CTUD, RES) 127Count Down (CTD)The CTD instruction counts downward.This instruction is available in structured text and function block asCTUD, see page 131.Operands:Relay LadderOperand Type Format DescriptionCounter COUNTER tag counter structurePreset DINT immediate how low to countAccum DINT immediate number of times the counter has countedinitial value is typically 0COUNTER StructureMnemonic Data Type Description.CD BOOL The count down enable bit indicates that the CTD instruction is enabled..DN BOOL The done bit indicates that .ACC ≥ .PRE..OV BOOL The overflow bit indicates that the counter exceeded the upper limit of 2,147,483,647. Thecounter then rolls over to -2,147,483,648 and begins counting up again..UN BOOL The underflow bit indicates that the counter exceeded the lower limit of -2,147,483,648. Thecounter then rolls over to 2,147,483,647 and begins counting down again..PRE DINT The preset value specifies the value which the accumulated value must reach before theinstruction sets the .DN bit..ACC DINT The accumulated value specifies the number of transitions the instruction has counted.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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176 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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