Logix5000 Controllers General Instructions - SLAC Confluence

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408 Array (File)/Shift <strong>Instructions</strong> (BSL, BSR, FFL, FFU, LFL, LFU)LIFO Load (LFL)The LFL instruction copies the Source value to the LIFO.Operands:Relay LadderOperand Type Format DescriptionSource SINT immediate data to be stored in the LIFOINTtagDINTREALstringLIFOstructureThe Source converts to the data type of the array tag. A smaller integerconverts to a larger integer by sign-extension.SINTarray tagLIFO to modifyINTDINTspecify the first element of the LIFOdo not use CONTROL.POS in the subscriptREALstringstructureControl CONTROL tag control structure for the operationtypically use the same CONTROL as theassociated LFULength DINT immediate maximum number of elements the LIFO canhold at one timePosition DINT immediate next location in the LIFO where theinstruction loads datainitial value is typically 0If you use a user-defined structure as the data type for the Source orLIFO operand, use the same structure for both operands.Publication 1756-RM003I-EN-P - January 2007
Array (File)/Shift <strong>Instructions</strong> (BSL, BSR, FFL, FFU, LFL, LFU) 409CONTROL StructureMnemonic Data Type Description:.EN BOOL The enable bit indicates that the LFL instruction is enabled..DN BOOL The done bit is set to indicate that the LIFO is full (.POS = .LEN). The .DN bit inhibits loadingthe LIFO until .POS < .LEN..EM BOOL The empty bit indicates that the LIFO is empty. If .LEN ≤ 0 or .POS < 0, both the .EM bit and.DN bit are set..LEN DINT The length specifies the maximum number of elements the LIFO can hold at one time..POS DINT The position identifies the location in the LIFO where the instruction will load the next value.Description:Use the LFL instruction with the LFU instruction to store and retrievedata in a last-in/first-out order. When used in pairs, the LFL and LFUinstructions establish an asynchronous shift register.Typically, the Source and the LIFO are the same data type.When enabled, the LFL instruction loads the Source value into theposition in the LIFO identified by the .POS value. The instructionloads one value each time the instruction is enabled, until the LIFOis full.IMPORTANTYou must test and confirm that the instruction doesn’t change data that you don’twant it to change.The LFL instruction operates on contiguous memory. In some cases, the instructionloads data past the array into other members of the tag. This happens if the length istoo big and the tag is a user-defined data type.Arithmetic Status Flags:not affectedFault Conditions:A Major Fault Will Occur If Fault Type Fault Code(starting element + .POS) > LIFO array size 4 20Publication 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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Page 358 and 359: 358 Array (File)/Misc. Instructions
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458 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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