Schneider 140CRA93200
1.控制規(guī)模
控制規(guī)模代表PLC控制能力,看其能對(duì)多少輸入、輸出點(diǎn)及對(duì)多少路模擬進(jìn)行控制。
控制規(guī)模與速度有關(guān)。因?yàn)橐?guī)模大了,用戶程序也長,執(zhí)行指令的速度不快,勢(shì)必延長PLC循環(huán)的時(shí)間,也必然會(huì)延長PLC對(duì)輸入信號(hào)的響應(yīng)。為了避免這個(gè)情況,PLC的工作速度就要快。所以,大型PLC的工作速度總是比小的要快。
控制規(guī)模還與內(nèi)存區(qū)的大小有關(guān)。規(guī)模大,用戶程序長,要求有更大的用戶存儲(chǔ)區(qū)。同時(shí)點(diǎn)數(shù)多,系統(tǒng)的存儲(chǔ)器輸入、輸出的信號(hào)區(qū)(輸入輸出繼電器區(qū)或稱輸入、輸出映射區(qū))也大。這個(gè)區(qū)大,相應(yīng)地內(nèi)部器件(解釋見后)也要增多,這些都要求有更大的系統(tǒng)存儲(chǔ)區(qū)。
控制規(guī)模還與輸入、輸出電路數(shù)有關(guān)。如控制規(guī)模為1024點(diǎn),那就得有1024條I/O電路。這些電路集成于I/O模塊中,而每個(gè)模塊有多少路的I/O點(diǎn)總是有數(shù)的。所以,規(guī)模大,所使用的模塊也多。
控制規(guī)模還與PLC指令系統(tǒng)有關(guān)。規(guī)模大的PLC指令條數(shù)多,指令的功能也強(qiáng),才能應(yīng)付對(duì)點(diǎn)數(shù)多的系統(tǒng)進(jìn)行控制的需要。
控制規(guī)模是對(duì)PLC其它性能指標(biāo)起著制約作用的指標(biāo);也是PLC劃分為微、小、中、大和特大型
2.組成模塊
PLC的結(jié)構(gòu)雖有箱體及模塊式之分,但從質(zhì)上看,箱體也是模塊,只是它集成了更多的功能。在此,不妨把PLC的模塊組成當(dāng)作所有PLC的結(jié)構(gòu)性能。
這個(gè)性能含義是指某型號(hào)PLC具有多少種模塊,各種模塊都有什么規(guī)格,并各具什么特點(diǎn)。
一般講,規(guī)模大的PLC,檔次高的PLC模塊的種類也多,規(guī)格也多,反映它的特點(diǎn)的性能指標(biāo)也高。但模塊的功能則單一些。相反,小型PLC、檔次低的PLC模塊種類也少,規(guī)格也少,指標(biāo)也低。但功能則多樣些,以至于集成為箱體。
組成PLC的模塊是PLC的硬件基礎(chǔ),只有弄清所選用的PLC都具有那些模塊及其特點(diǎn),才能正確選用模塊,去組成一臺(tái)完整的PLC,以滿足控制系統(tǒng)對(duì)PLC的要求。
廈門莫格電氣自動(dòng)化有限公司
:張 美 霞
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STANLEY VIDMAR 9-DRAWER STORAGE CABINET, 28" X 30" X 59", HANDLES, 5/7-C
UNION WIRE ROPE 460 Ft 7/16 INCH DIA 6X36 LAY R/L CORE/FINISH IWRC W/ PLUG ENDS
STANLEY VIDMAR 7-DRAWER STORAGE CABINET, 30" X 28" X 59", 3/30-B
YALE * 3-TON 10FT CHAIN HOIST * NO LABEL
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CLIPPER 6 BELT FASTENERS GALVANIZED NYLOSTEEL PINS 12" NIB
DENGENSHA 12" VIBRATORY PARTS FEEDER AF.V-N-S-S10-DL?H
COMMERCIAL GROUP PRODUCT 150' OAL, 5/16" DIA WIRE ROPE SW-710 *NEW*
CENTRAL MACHINERY 1HP 16-SPEED HEAVY DUTY DRILL PRESS MODEL NO. 583
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PPI PRECISION PULLEY & IDLER CONVEYOR TROUGHING IDLER C5-20TESA-36GR
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MANNESMANN DEMAG EKDH WIRE ROPE HOIST TROLLEY W/ 3PH 1630RPM 0.29HP MOTOR KDF63
P&H HARNISCHFEGER 16FT LIFT, 5-TON HOIST RL9C-V4 W/ MOTORIZED TROLLEY
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ELLIOTT COMPANY 12" PACKING RING 629466 105367
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INGERSOLL-RAND ARO INDUSTRIAL ROLLER CHAIN HOIST 1/4 TON W/ PENDANT
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BUHLER .26MM BLOW-THROUGH AIRLOCK MPSH-36/38LP TK1
27"H, 32"W, 16"D 2 DOOR 2 SHELF LOCKABLE STORAGE CABINET
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RSC SAPPHIRE ANSI STANDARD ROLLER CHAIN ASA 120-2 CP X 10 FEET
CHESTER ELM-5 ELECTRIC WORM DRIVE HOIST WITH TROLLEY 5 TON
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