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Showing posts from June, 2016

Mitsubishi PLC SET, RST instruction

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SET:setcommand,keeping the actionON thedirective.
RST:resetinstructions,keeps the actionOFF directive.
SET commandcan beused toY,M,S,T,CY,MandS,RST directivescan beused toresetorD,V andz-zeroWordelements.
IfX0 figure1normallyopencontactconnected,Y0 toON andkeeptheState,even if the X0 normallyopendisconnect,itstillremains in the ON state.X1 normallyopencontactcloses,Y0 becomesOFF andremain in theState,even if the X1 normallyopendisconnect,itstillremains in the OFF state(seewaveformsinFigure1).
On the sameprogrammingelement,can beSET multiple timesandRST

Mitsubishi PLC PLS, PLF instruction

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PLS (Pulse):risingdifferentialoutputdirective.
PLF:fallingedge of differentialoutputdirective.
PLS andPLF commandcan only beused for the outputrelaysandauxiliaryrelays(does notincludespecialauxiliaryrelays).M0 in the figureonlyin the X0 normallyopenfromopentoclose(X0risingedge)whenascancycleforON,M1 onlyonX0 normallyopencontactconnectedbecomedisconnected(X0thefallingedge)_whenascancycleisON.
When the PLC fromRUN toSTOP,and thenfromSTOP toRUN whenitsinputsignalstillisON,PLS M0instructionwilloutputapulse.However,

Mitsubishi FX series PLC master command (MC / MCR)

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FX seriesPLC basiclogicalinstruction20or27,stepinstructions2,commandmorethan 100 pieces (differentseries).FX2N thissection, forexample,describeditsbasiclogicinstructionsandstep ladder instructionand itsapplication.
FX2N total27basiclogicalinstructions,containingsome20basiclogicseriesPLC instructions.
Masterinstruction(MC/MCR)
(1)MC (masterinstruction)forpubliccontactsconnected in series.After the implementation of MC,leftbusbehindtheMC contacts.
(2)MCR (masterresetinstructions)itisMC resetinstructioninstructions,theMCR instructionbusleftof the restorelocation.
Programmingoften

Mitsubishi PLC MPS, MRD, MPP instructions

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FX seriesPLC basiclogicalinstruction20or27,stepinstructions2,commandmorethan 100 pieces (differentseries).FX2N thissection, forexample,describeditsbasiclogicinstructionsandstep ladder instructionand itsapplication.
FX2N total27basiclogicalinstructions,containingsome20basiclogicseriesPLC instructions.
Stackdirective(MPS/MRD/MPP)
Stackinstructionsare the newFX seriesbasicinstructions,formultipleoutputcircuitforprogrammingconvenience.Has11storesin the FX seriesPLC modulesarespecificallydesigned tostoretheintermediateresults of the program,known as the stackmemory.
(1) the MPS (stackinstructions)theresultsinto