State Machine Example #2

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Presentation transcript:

State Machine Example #2

State Machine Example #2

State Machine Example #2 iSENSOR S0 S1 S2 iEXT /iSENSOR•iRET oCYL=1 oCYL=0

Example #2 State Diagram iSENSOR S0 S1 S2 iEXT /iSENSOR•iRET oCYL=1 oCYL=0 CurrSt iSENSOR iEXT iRET | NextSt ------------------------------------ S0 0 X X | S0 S0 1 X X | S1 S1 X 0 X | S1 S1 X 1 X | S2 S2 0 X 0 | S2 S2 0 X 1 | S0 S2 1 X X | S2

Example #2 State Diagram iSENSOR S0 S1 S2 iEXT /iSENSOR•iRET oCYL=1 oCYL=0 CurrSt iSENSOR iEXT iRET | NextSt ------------------------------------ S0 0 X X | S0 S0 1 X X | S1 S1 X 0 X | S1 S1 X 1 X | S2 S2 0 X 0 | S2 S2 0 X 1 | S0 S2 1 X X | S2 cS0 = cS2•/iSENSOR•iRET + cS0•/iSENSOR + /cS0•/cS1•/cS2 cS1 = cS0•iSENSOR + cS1•/iEXT cS2 = cS1•iEXT + cS2•/(/iSENSOR•iRET) = cS1•iEXT + cS2•(iSENSOR + /iRET)

Example #2 State Diagram iSENSOR S0 S1 S2 iEXT /iSENSOR•iRET oCYL=1 oCYL=0 cS0 = cS2•/iSENSOR•iRET + cS0•/iSENSOR + /cS0•/cS1•/cS2 cS1 = cS0•iSENSOR + cS1•/iEXT cS2 = cS1•iEXT + cS2•iSENSOR + cS2•/iRET)

State Machines in Ladder Logic Pure relay logic - traditional design: 2 states = 1 coil 3-4 states = 2 coils 5-8 states = 3 coils, etc. difficult to debug, modify and document Pure relay logic - “one-hot” design 1 coil per state easier to debug, modify, and document watch out for “illegal” states RLL-Plus “Stages” JMP “coils” easiest to write and maintain not available in all brands of PLC’s

Ex #2 - RLL-Plus Stages S0 S2 S1 oCYL=0 /iSENSOR•iRET iSENSOR iEXT

Multi-state Example When sensor detects block; clamp block, drill hole, shift, drill 2nd hole, shift back, release clamp

Inputs and Outputs iSENSOR block present iDRILLDN drill is down iDRILLUP drill is up iCLAMPED fully clamped iRELEASED fully unclamped iPOS1 unshifted iPOS2 shifted oDRILL start drilling oCLAMP activate clamp oSHIFT shift block holder

State Diagrams One state per “action” Look for “wait” states needed

State Diagram

RLL-Plus

RLL-Plus

RLL-Plus

Do-More Videos Assignment https://www.automationdirect.com/do-more/brx/Support/index - Do-more Designer – WELCOME! - Do-more Designer – Quick Start - Do-more Way Part I, II, and III https://www.automationdirect.com/do-more/brx/Support/Do- more-Designer - Do-more Designer Program Control: SG Stage and JMP instructions