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l(f)ڣ[2008-11-25]    [3406]ΡЇ(gu)늚Ј(chng)ُ(gu)W(wng)[EM39.com]{(bio)pԄ(dng)L}
     

Ԅ(dng)I(lng)PLCһNҪĿO(sh)Ŀǰ200Sa(chn)300ƷNPLCa(chn)Ʒ(yng)܇23%Zʳӹ16.4%W(xu)/ˎ14.6%/Vɽ11.5%{/켈11.3%ИI(y)ʹλW(xu)߸˽PLCČ(du)PLCİl(f)չY(ji)(gu)(yng)õȻ֪R(sh)һ(jin)ڌ(du)λW(wng)

һPLCİl(f)չv
ڹI(y)a(chn)^(gu)_P(gun)߉݋lM(jn)(dng)߉݋P(gun)ϵM(jn)Bio(h)(dng)ĿxɢĔ(sh)(j)ɼy(tng)@Щͨ^(gu)(dng)늚ϵy(tng)(li)(sh)F(xin)ġ1968(gu)GMͨ܇˾ȡ^늚bõҪڶ(gu)(sh)ֹ˾Ƴ˻ڼ·Ӽg(sh)Ŀbã״βó򻯵ֶΑ(yng)늚@ǵһɾQProgrammable ControllerPC
(g)Ӌ(j)C(j)(jin)QPCl(f)չ(li)˷Ҳ˷ӳɾ̿Ĺc(din)ɾProgrammable Logic ControllerPLCF(xin)ڣԳPLC(jin)QPC
PLCĶxSN(gu)H늹ίT(hu)IEC(du)PLCĶxǣɾ̿һN(sh)\(yn)ϵy(tng)ڹI(y)h(hun)‘(yng)öO(sh)Ӌ(j)ÿɾĴAÁ(li)(ni)A(zh)߉݋\(yn)r(sh)Ӌ(j)(sh)g(sh)\(yn)Ȳָͨ^(gu)(sh)ֵģMݔݔƸN͵ęC(j)еa(chn)^(gu)ɾP(gun)O(sh)䣬(yng)cI(y)ϵy(tng)γһ(g)wڔU(ku)书ܵԭtO(sh)Ӌ(j)
o(j)8090PLCl(f)չĕr(sh)L(zhng)һֱ֞30~40%@r(sh)PLC̎ģM(sh)\(yn)˙C(j)ӿ;W(wng)j(lu)õPLCuM(jn)^(gu)̿I(lng)ijЩ(yng)ȡ^(gu)̿I(lng)̎ڽy(tng)ελDCSϵy(tng)
PLCͨԏ(qing)ʹ÷㡢m(yng)VɿԸߡɔ_(qing)̺(jin)εc(din)PLCڹI(y)Ԅ(dng)؄eеĵλڿA(y)ҊČ(li)ǟo(w)ȡġ

PLCĘ(gu)
ĽY(ji)(gu)ϷPLC̶֞ʽͽMʽģKʽɷN̶ʽPLCCPUI/O塢@ʾ(ni)KԴȣ@ЩԪؽMϳһ(g)ɲжwģKʽPLCCPUģKI/OģK(ni)桢ԴģKװC(j)@ЩģK԰һҎ(gu)tM

CPUĘ(gu)
CPUPLCĺ(jng)ИеÿPLCһ(g)CPUPLCϵy(tng)xĹܽղAÑ͔(sh)(j)ÒķʽɼɬF(xin)(chng)ݔb́(li)ĠB(ti)(sh)(j)Ҏ(gu)ļĴͬr(sh)\ԴPLC(ni)·ĹB(ti);^(gu)еZ(y)e(cu)`M(jn)\(yn)кÑAlxȡָ(jng)ָٰҎ(gu)΄(w)a(chn)(yng)Ŀ̖(ho)ȥָ]P(gun)Ŀ·
CPUҪ\(yn)Ĵ(sh)F(xin)֮g“(lin)ϵĔ(sh)(j)ƼB(ti)(gu)CPUԪ߀оƬӿڼP(gun)·(ni)Ҫڴ惦(ch)򼰔(sh)(j)PLCȱٵĽMɆԪ
ʹ߿(li)ҪԔ(x)CPUă(ni)·(du)ֵĹC(j)߀Ǒ(yng)⡣CPUĿCPUxȡָָ(zh)ָ(ji)ʎ̖(ho)ơ\(yn)M(jn)Д(sh)ֻ߉݋\(yn)ڿָ]¹Ĵc\(yn)惦(ch)\(yn)gY(ji)Ҳڿָ]¹
CPUٶȺ̓(ni)PLCҪ(sh)QPLCĹٶIO(sh)ܛȣҎ(gu)ģ

ġI/OģK
PLCc늚·Ľӿͨ^(gu)ݔݔ֣I/OɵġI/OģKPLCI/O·ݔ땺ӳݔ̖(ho)B(ti)ݔc(din)ӳݔiB(ti)ݔģK̖(ho)׃Qɔ(sh)̖(ho)M(jn)PLCϵy(tng)ݔģK෴I/O֞_P(gun)ݔ루DI_P(gun)ݔDOģMݔ루AIģMݔAOģK
_P(gun)ָֻ_P(gun)10ɷNB(ti)̖(ho)ģMָBm(x)׃õI/O£
_P(gun)늉ˮƽ֣220VAC110VAC24VDCxʽ^x;wܸx
ģM̖(ho)ͷͣ4-20mA,0-20mA늉ͣ0-10V,0-5V,-10-10Vȣȷ12bit,14bit,16bitȡ
ͨIO߀IOģKż}_ģK
I/Oc(din)(sh)_ģKҎ(gu)񼰔(sh)I/OģKɶ(sh)CPUܹĻõĵװC(j)ܲ۔(sh)

ԴģK
PLCԴڞPLCģKļ·ṩԴͬr(sh)е߀ݔ·ṩ24VĹԴԴݔУԴ220VAC110VACֱԴõĞ24VAC

װC(j)
(sh)ģKʽPLCʹõװC(j)ǣ늚(sh)F(xin)ģKg“(lin)ϵʹCPUL(wn)װϵģKC(j)е(sh)F(xin)ģKgBӣʹģK(gu)һ(g)w

PLCϵy(tng)O(sh)
1O(sh)䣺PLC_l(f)(yng)O(jin)y(c)\(yn)СzSo(h)ȱٵھ(du)ϵy(tng)һЩO(sh)O(jin)PLCPLCƵϵy(tng)ĹrֱӅcF(xin)(chng)\(yn)СPLCһֳ;ĿǰһӋ(j)C(j)\(yn)оܛ䮔(dng)
2˙C(j)棺(jin)ε˙C(j)ָʾͰoĿǰҺ|ʽһwʽTKˑ(yng)Խ(li)ԽVӋ(j)C(j)\(yn)нMB(ti)ܛ䮔(dng)˙C(j)dzռ
3ݔݔO(sh)䣺Եش惦(ch)Ñ(sh)(j)EPROMEEPROMlaxݔģMλӡC(j)ȡ

PLCͨ“(lin)W(wng)
M(jn)ĹI(y)W(wng)j(lu)g(sh)ѸЧռa(chn)͹픵(sh)(j)W(wng)j(lu)Ԅ(dng)ϵy(tng)ɹеҪԽ(li)Խ@"W(wng)j(lu)ǿ"^c(din)f(shu)
PLCͨ“(lin)W(wng)ĹʹPLCcPLC ֮gPLCcλӋ(j)C(j)ԼO(sh)֮g܉򽻓QϢγһ(g)y(tng)һw(sh)F(xin)ɢп(sh)PLCRS-232ӿڣ߀һЩ(ni)ָ֧ͨŅf(xi)hĽӿڡ
PLCͨ߀δ(sh)F(xin)ԣIECҎ(gu)˶NF(xin)(chng)(bio)(zhn)PLCSҾв
(du)һ(g)Ԅ(dng)(؄eдҎ(gu)ϵy(tng))(li)vxW(wng)j(lu)dzҪW(wng)j(lu)_ŵԷ㲻ͬO(sh)ļɼδ(li)ϵy(tng)Ҏ(gu)ģĔU(ku)չΣᘌ(du)ͬW(wng)j(lu)ӴεĂݔҪxW(wng)j(lu)ʽ@^˽ԓW(wng)j(lu)(bio)(zhn)ąf(xi)hC(j)ƵǰM(jn)УٴCϿ]ϵy(tng)ɱO(sh)F(xin)(chng)h(hun)mԵȾw(wn)}_ͬӴʹõľW(wng)j(lu)(bio)(zhn)

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