PLC Master Instruction MC (Master Control) And Master Reset ...

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Skip to content MC (MasterControl): the masterinstructionordirectivepubliccontactsconnected in series,used torepresent the beginningof the masterzone. MC directivecan beused tooutputrelayandauxiliaryrelaymy(does notincludespecialauxiliaryrelays). MCR (MasterControlReset):masterresetinstructioninstructionsMC,used torepresent the endof the masterzone. Whenprogramming,oftenencountermanywindings at the same timeacontrol,oragroup of contacts,ifeachcoilofstringinto the samecontactin the controlcircuit,willtake up a lot of storageunits,masterinstructioncansolvethisproblem.Contactmasterinstructionis called the mastercontacts,contactsinladderdiagramin the vertical.Mastercontactsisswitch to controlagroup of circuits. Andcontactsmust beconnected to the mastercontactLD orLDI instruction,in other words,afterMC instruction is executed,theback of the busto the mastercontact,MCR–bus(LD)back toits originallocation. X0 inFigure1normallyopencontact is switched on, the executionbetweenMC and MCR instruction;MC commandinputcircuit is disconnected,does notperformtherangeofinstruction,accumulationofthesetimers,counters,reset/setcommand–drivensoftmaintainsitsstatus of components; the restof the componentsarereset,non-integratingtimersandOUT.Order–drivencomponenttoOFF, Figure1SP in the instructionsfor the handheldprogrammer and the SPACEBAR. Use of MC inMC extentinstructions are callednested(seeFigure2).MC andMCR instructioncontainsnestedlayersN0~N7,N0 totop,bottomasN7.When there are nonestedstructure,usuallymade of N0 programming,N0 withnolimit to the number. When youhavenested,nestedlayersof the MCR instructiontoresetlow,such asMCR N2willreset the 2~7layer.    

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