Logix5000 Controllers General Instructions - SLAC Confluence

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670 Structured Text Programming<strong>Instructions</strong>Structured text statements can also be instructions. See the LocatorTable at the beginning of this manual for a list of the instructionsavailable in structured text. A structured text instruction executes eachtime it is scanned. A structured text instruction within a constructexecutes every time the conditions of the construct are true. If theconditions of the construct are false, the statements within theconstruct are not scanned. There is no rung-condition or statetransition that triggers execution.This differs from function block instructions that use EnableIn totrigger execution. Structured text instructions execute as if EnableIn isalways set.This also differs from relay ladder instructions that userung-condition-in to trigger execution. Some relay ladder instructionsonly execute when rung-condition-in toggles from false to true. Theseare transitional relay ladder instructions. In structured text, instructionswill execute each time they are scanned unless you pre-condition theexecution of the structured text instruction.For example, the ABL instruction is a transitional instruction in relayladder. In this example, the ABL instruction only executes on a scanwhen tag_xic transitions from cleared to set. The ABL instruction doesnot execute when tag_xic stays set or when tag_xic is cleared.In structured text, if you write this example as:IF tag_xic THEN ABL(0,serial_control);END_IF;the ABL instruction will execute every scan that tag_xic is set, not justwhen tag_xic transitions from cleared to set.Publication 1756-RM003I-EN-P - January 2007
Structured Text Programming 671If you want the ABL instruction to execute only when tag_xictransitions from cleared to set, you have to condition the structuredtext instruction. Use a one shot to trigger execution.osri_1.InputBit := tag_xic;OSRI(osri_1);IF (osri_1.OutputBit) THENABL(0,serial_control);END_IF;ConstructsConstructs can be programmed singly or nested within otherconstructs.If You Want To Use This Construct Available In These Languages See Pagedo something if or when specificconditions occurIF...THEN structured text 672select what to do based on a numerical value CASE...OF structured text 675do something a specific number of times beforedoing anything elsekeep doing something as long as certainconditions are trueFOR...DO structured text 678WHILE...DO structured text 681keep doing something until a condition is true REPEAT...UNTIL structured text 684Some key words are reserved for future useThese constructs are not available:• GOTO• REPEATRSLogix 5000 software will not let you use them as tag names orconstructs.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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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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Page 636 and 637: 636 Common AttributesInstructions e
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Page 691 and 692: IndexAABL instruction 575ABS instru
Page 693 and 694: Index 693DEG 556FRD 565introduction
Page 695 and 696: Index 695sequencer 421serial port 5
Page 697 and 698: Index 697program/operator controlov
Page 699 and 700: Index 699timer on delay with reset
Page 701 and 702: Pub. Title/Type Logix5000 Controlle
Page 705: Rockwell AutomationSupportRockwell
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