Logix5000 Controllers General Instructions - SLAC Confluence

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572 ASCII Serial Port <strong>Instructions</strong> (ABL, ACB, ACL, AHL, ARD, ARL, AWA, AWT)Instruction ExecutionASCII serial port instructions execute asynchronous to the scan ofthe logic:LogicRung-condition-in ofinstruction transitionsfrom false to trueInstruction enters theASCII queue.Serial PortASCII QueueInstruction 1Instruction 2Instruction 3Instruction 4Data flows betweenbuffer and serial port.ASCII TaskInstruction at the topof the queue executes.Data flowsbetween task andbuffer.BufferEach ASCII serial port instruction (except ACL) uses aSERIAL_PORT_CONTROL structure to perform the followingfunctions:• control the execution of the instruction• provide status information about the instructionPublication 1756-RM003I-EN-P - January 2007
ASCII Serial Port <strong>Instructions</strong> (ABL, ACB, ACL, AHL, ARD, ARL, AWA, AWT) 573The following timing diagram depicts the changes in the status bits asan ABL instruction tests the buffer for termination characters.scan scan scan scanrung-condition-in false true false true false.EN off on off on off.EU off on.RN off on off on off.DN or .ER off on off on.FD off on off on.EM off on off onenters queueresets status bitsexecutesin this example,finds terminationcharacterswhen scanned and .DNor .ER are set, sets the.EM bitThe ASCII queue holds up to 16 instructions. When the queue is full,an instruction tries to enter the queue on each subsequent scan of theinstruction, as depicted below:scan scan scan scanrung-condition-in false true false.EN off on.EU off onattempts to enter queue but queue is fullenters queuePublication 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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Page 522 and 523: 522 Trigonometric Instructions (SIN
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622 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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