Logix5000 Controllers General Instructions - SLAC Confluence

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302 Move/Logical <strong>Instructions</strong> (MOV, MVM, BTD, MVMT, BTDT, CLR, SWPB, AND, OR, XOR, NOT, BAND, BOR, BXOR, BNOT)Description:The SWPB instruction rearranges the order of the bytes of the Source.It places the result in the Destination.When you read or write ASCII characters, you typically do not need toswap characters. The ASCII read and write instructions (ARD, ARL,AWA, AWT) automatically swap characters, as shown below.bar code reader42969B ATag Name Value Style Typebar_code[0] AB ASCII INTA B42968Arithmetic Status Flags:Fault Conditions:not affectednoneExecution:Condition Relay Ladder Action Structured Text Actionprescan The rung-condition-out is set to false. No action takenrung-condition-in is false The rung-condition-out is set to false. narung-condition-in is true The rung-condition-out is set to true. naEnableIn is set na EnableIn is always set.The instruction executes.instruction execution The instruction rearranges the specified bytes. The instruction rearranges the specified bytes.postscan The rung-condition-out is set to false. No action taken.Publication 1756-RM003I-EN-P - January 2007
Move/Logical <strong>Instructions</strong> (MOV, MVM, BTD, MVMT, BTDT, CLR, SWPB, AND, OR, XOR, NOT, BAND, BOR, BXOR, BNOT) 303Example 1:The three SWPB instructions each reorder the bytes of DINT_1according to a different order mode. The display style is ASCII, andeach character represents one byte. Each instruction places the bytes,in the new order, in a different Destination.Relay LadderStructured TextSWPB(DINT_1,REVERSE,DINT_1_reverse);SWPB(DINT_1,WORD,DINT_1_swap_word);SWPB(DINT_1,HIGHLOW,DINT_1_swap_high_low);Example 2:The following example reverses the bytes in each element of an array.For an RSLogix 5000 project that contains this example, open theRSLogix 5000\Projects\Samples folder, Swap_Bytes_in_Array.ACD file.1. Initialize the tags. The SIZE instruction finds the number ofelements in array and stores that value in array_length. Asubsequent instruction uses this value to determine when theroutine has acted on all the elements in the array.2. Reverse the bytes in one element of array.• The SWPB instruction reverses the bytes of the element numberthat is indicated by the value of index. For example, when indexequals 0, the SWPB instruction acts on array[0].• The ADD instruction increments index. The next time theinstruction executes, the SWPB instruction acts on the nextelement in array.3. Determine when the SWPB instruction has acted on all theelements in the array.• If index is less then the number of elements in the array(array_length), then continue with the next element in the array.• If index equals array_length, then the SWPB has acted on all theelements in the array.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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250 Compute/Math Instructions (CPT,
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352 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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