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Showing posts from May, 2016

FX series PLC display and graphic operating Terminal

iththedevelopment of factoryautomation,micro-PLC controlmore and morecomplexandadvanced,FX seriesPLC is equipped with a widevarietyofdisplaymoduleandgraphicsoperatorterminalsas a human-machineinterface.
1.DisplaymoduleFX1N –5DM FX1N –5DM has4keysand a backlitLED display,installeddirectlyon the FX1S,FX1N,withoutwiring. Itcanshow the following: (1)PLC programmingtheon/offstatus of the component; (2)timer(t)andcounter(c)thecurrentvalueorsetvalue; (3) the dataregister(d)thecurrentvalue; (4)FX1N specialunitsandspecialmodulesin the bufferr

Two main extensions of Mitsubishi FX series PLC

Thedelayhas a maximumvalue of FX seriesPLC,such asdelaygreater thanthemaximumvalue of the timercan beusedmore than onetimerdelayrelay. The specificmethodis: (1)beforeusinganormallyopenstart the nexttimertimer. (2)counterandtimerwork.

Design of PLC control system the main steps to be followed and the content

(1)technicalanalysis In-depthunderstanding of processcontrolobject,features,requirements,anddividingcontrolofallphases,summarized the variousstagesof,andbetween the variousstagesoftransitionconditions,draw the flowchartcontrolflow chartorfunction. (2)select the appropriatePLC type When youselect the PLC model,mainlyconsider the followingpoints:  1choiceoffunctions.ForsmallPLC mainI/O expansionmodule,a/dandd/amodulesandfeatures of the directive(such asinterrupt,PID, etc).  2I/O number to determine.Statisticalcontrolsystemswitches,analogI/O point numbers,andconsiderfutureexpansion(Generalplus10%~20%spare

PLC program design

PLC programming is generallydivided into the followingsteps: 1.programmingpreparations Getting ready for a programistounderstand the wholecontrolsystemfunctionality,scale,control,input/outputsignalsoftypeandquantity,specialfeaturesof the interfaceand the relationshipwith the otherdevice,contentsandmethodsofcommunication,theentireconceptof the controlsystem as awhole.Thenfamiliar withthecontrolledobjects, objects and control functions in accordance with the control response,signalorcontrolregion,determine the physicallocationofdevicesandcontroldevices,understandingofeachsignalandcontrolsignalform,function,size, and the relationshipbetween. 2.Designblockdiagram According to theGeneral

PLC flow chart of sequential control design method

According to the functionalflowchart,tostep in as the core,from the startstep by step by stepdesignuntilcompletion.Thekey to thismethodis a diagramdrawingfunction.FirstStateof the outputis used to controltheworkprocessconsists of severalsteps,conversionbetween the stepandpointed out thatworkersconditionsandcontrols of eachobject.Thisprocessfocused ontheworkofall the information.At the time of programming,you canuse the intermediaterelaymmemorystep,step by stepsequence,sequencecontrolcommandcanalso be usedtoachieve.

The steps and principles of PLC programming summary

1.TheGeneralsteps for PLC programming (1)ifthePLC withprogram,should learn moreabout the programfeaturesandlevel of satisfaction of needsandmodifiability.UsingPLC comeswithprogramas far as possible. (2)allPLC related to theinputsignal(button,switch,speed, andtemperaturesensor), the outputsignal(contactors,solenoidvalves,lights, etc)listrespectively,andPLC interfacewithinrangedeterminedforeachsignal is assignedanumber. (3)detailedknowledge of productionprocessandequipmentrequirementsforcontrolsystems.Draw the variousfunctions of the systemofworkcirculatingdiagramorflow chart,functionaldiagramsandrelatedsignaltimingdiagram. (4)