選型注意事項(xiàng)
S7-300PLC的選型原則是據(jù)生產(chǎn)工藝所需的功能和容量進(jìn)行選型，并考慮維護(hù)的方便性、備件的通用性，以及是否易于擴(kuò)展和有無特殊功能等要求。選型時(shí)具體注意以下幾方面：
(1)有關(guān)參數(shù)確定。一是輸入/輸出點(diǎn)數(shù)(I/O點(diǎn)數(shù))確定。這是確定PLC規(guī)模的一個(gè)重要依據(jù)，一定要根據(jù)實(shí)際情況留出適當(dāng)余量和擴(kuò)展余地。二是PLC存儲(chǔ)容量確定。注意當(dāng)系統(tǒng)有模擬量信號(hào)存在或要進(jìn)行大量數(shù)據(jù)處理時(shí)，其存儲(chǔ)容量應(yīng)選大一些。
(2)系統(tǒng)軟硬件選擇。一是擴(kuò)展方式選擇，S7-300PLC有多種擴(kuò)展方式，實(shí)際選用時(shí)，可通過控制系統(tǒng)接口模塊擴(kuò)展機(jī)架、Profibus-DP現(xiàn)場(chǎng)總線、通信模塊、運(yùn)程I/O及PLC子站等多種方式來擴(kuò)展PLC或預(yù)留擴(kuò)展口;二是PLC的聯(lián)網(wǎng)，包括PLC與計(jì)算機(jī)聯(lián)網(wǎng)和PLC之間相互聯(lián)網(wǎng)兩種方式。因S7-300PLC的工業(yè)通信網(wǎng)絡(luò)淡化了PLC與DCS的界限，聯(lián)網(wǎng)的解決方案很多，用戶可根據(jù)企業(yè)的要求選用;三是CPU的選擇，CPU的選型是合理配置系統(tǒng)資源的關(guān)鍵，選擇時(shí)必須根據(jù)控制系統(tǒng)對(duì)CPU的要求(包括系統(tǒng)集成功能、程序塊數(shù)量限制、各種位資源、MPI接口能力、是否有
PROFIBUS-DP主從接口、RAM容量、溫度范圍等)，并好在西門子公司的技術(shù)支持下進(jìn)行，以獲得合理的選型;四是編程軟件的選擇，這主要考慮對(duì)CPU的支持狀況，我們的體會(huì)是：STEP7V4.0對(duì)有些型號(hào)的CPU不支持，硬件組態(tài)時(shí)會(huì)發(fā)生故障出錯(cuò)，而STEP7V5.0則不存在這種問題。
二、設(shè)計(jì)及使用注意事項(xiàng)
1. 設(shè)計(jì)注意事項(xiàng)
設(shè)計(jì)時(shí)主要應(yīng)注意以下幾方面：
(1)PLC輸出電路中沒有保護(hù)，因此在外部電路中應(yīng)設(shè)置串聯(lián)熔斷器等保護(hù)裝置，以防止負(fù)載短路造成PLC損壞。熔斷器容量一般為0.5A。
(2)PLC存在I/O響應(yīng)延遲問題，因此在快速響應(yīng)設(shè)備中應(yīng)加以注意。MPI通信協(xié)議雖簡(jiǎn)單易行，但響應(yīng)速度較慢。
(3)編制控制程序時(shí)，好用模塊式結(jié)構(gòu)程序。這樣既可增強(qiáng)程序的可讀性，方便調(diào)試和維護(hù)工作;又能使數(shù)據(jù)庫結(jié)構(gòu)統(tǒng)一，方便WinCC組態(tài)時(shí)變量標(biāo)簽的統(tǒng)一編制和設(shè)備狀態(tài)的統(tǒng)一顯示。
(4)硬件資源。要合理配置硬件資源，以提高系統(tǒng)可靠性。如PLC電源配電系統(tǒng)要配備冗余的UPS不間斷電源，以排除停電對(duì)全線運(yùn)行的不利影響。又如對(duì)電機(jī)的控制回路要進(jìn)行繼電器隔離，以消除外部負(fù)載對(duì)I/O模塊的可能損壞。另外，系統(tǒng)設(shè)備要采用獨(dú)立的接地系統(tǒng)，以減少雜波干擾。
ALLEN BRADLEY 1492-CB2H100 CIRCUIT BREAKER ***NIB***
Lot 5 Allen Bradley Relays Contactors 100-A09ND3 3169
50 Allen Bradley Carbon Comp Resistors 100k 1/2W 5%
Lot (4) Allen Bradley 100-C23*10 Contactor w/ relay S3
Allen Bradley SLC 100 w/ expansion unit
100 Allen Bradley Carbon Comp Resistors 100k 1/2W 5%
Lot (9) Allen Bradley 100-C23*10 Contactor S3
Allen Bradley PLC SLC-100/150 1745-PCC cable (7ft)
ALLEN BRADLEY 100-B25ON*3 CONTACTOR 3 PHASE 600 VAC MAX
Allen-Bradley 100-C12EJ10 24V DC HZ 13 Contactor NEW
ALLEN BRADLEY 1336S-BRF100-AA?-EN4 SER E AC DRIVE
2098-DSD-HV100-?SE Allen Bradley 2098DSDHV100SE
ALLEN BRADLEY 100-B110N*3
FACTORY SEALED ALLEN BRADLEY 100S-C60D14C CONTACTOR
Allen Bradley Contactor 100-C12Z*10 Series A
Allen Bradley Contactor Starter 100 B180N*3 _ 208V Coil
LOT 3 ALLEN BRADLEY 100-C09*10 & 193-EA1DB CONTR. & REL
ALLEN BRADLEY 100-B110ND3 USPP 100B110ND3
ALLEN BRADLEY 140-MN-0630 100-C09*10 STARTER CONTACTOR
Allen Bradley 1756-EN2T -EtherNet 10-100M Comm Mod
ALLEN BRADLEY 100S-C30UDJ13BC USPP 100SC30UDJ13BC
100-B180ND3 Allen Bradley Contactor
Allen Bradley PLC SLC-100/150 USB 1745-PCC
Allen Bradley User's Manual 1745 SLC 100 Book Guide
100 Ohm 2W 5% Carbon Comp ALLEN BRADLEY resistor 25 ea.
ALLEN BRADLEY 100-A45N*3 STARTER *
Allen Bradley Bar Code Reader Wedge Access 2755-CE100
ALLEN BRADLEY 1492-W4 LOT OF 100 PCS TERMINAL BLOCK NEW
LOT OF 3 ALLEN BRADLEY CONTACTORS 100-A18NO2 12-05 L-1
Allen Bradley Resistors 100 pieces
ALLEN BRADLEY SIZE 4 STARTER 509-EOD 509-E0D 120V 100HP
Allen-Bradley 100-ETA30, Electronic Timing Module
Allen Bradley 100-C60*00 100C6000 Contactor NEW 110V
Allen Bradley Panel Mount Disconnect 1494F-N100 100 A
Allen Bradley Panel Mount Disconnect 1494V-DS100 100 A
Allen Bradley 1745-E101 1745E101 SLC 100 Expansion Unit
Allen-Bradley 100-A18ND3 AC Contactor
Allen Bradley 1398-DDM-005 | Ultra 100 Servo Drive
Allen Bradley Starter Auxillary 100-DNY42S **NIB**
Allen Bradley 100-D110 Contactor Non Reversing F1
Allen Bradley AB Starters IEC Bulletin 100-C37D10
ALLEN-BRADLEY SLC 1745-PT1 PROGRAMMER FOR 100/150 PLC
Allen Bradley PLC SLC-100/150 1745-PCC cable (12ft)
4 ALLEN-BRADLEY 1492-CB2G100 10-AMP CIRCUIT BREAKERS
ALLEN BRADLEY BAR CODE DECODER 100-240VAC 2755-DD1A
ALLEN BRADLEY 1492-CB1 1492-CB1G100 10 AMP CB
Allen Bradley 100-C30Z*00 Contactor Complete Device
ALLEN-BRADLEY 100S-C30D14C GUARD MASTER 110V COIL
ALLEN-BRADLEY CONTACTOR 24 VDC DIODE #100-C09DJ400
ALLEN-BRADLEY CONTACTOR 24 VDC DIODE #100-C09DJ400
ALLEN BRADLEY 100-C37-00/100-?C37*00 CONTACTOR **XLNT**
ALLEN-BRADLEY CONTACTOR 24 VDC DIODE #100-C09DJ400
ALLEN BRADLEY 100A 500L-DOD93 115-120V COIL CONTACTOR
ALLEN-BRADLEY CONTACTOR 24 VDC DIODE #100-C09DJ400
ALLEN-BRADLEY CONTACTOR 24 VDC DIODE #100-C09DJ400
ALLEN BRADLEY 100-SB10 AUXILIARY CONTACT BLOCK
ALLEN-BRADLEY CONTACTOR 24 VDC DIODE #100-C09DJ400
Allen Bradley AB IEC Contactor 100-C23D10
Allen Bradley Contactor 100-C16D10 16AMP 3POLE 120VAC
Allen Bradley 100-B180N*3 3Pole Contactor 225Amp 600VAC
Allen Bradley AB Starters IEC Bulletin 100-C16D10
Allen Bradley 100-A75N*3 3P Contactor 100A 600V 110-120
ALLEN BRADLEY 100-C23D300 CONTACTOR NEW IN BOX
Allen Bradley Contactor 100-C72*00 3P 100A 600V 110-120
Allen Bradley 100-A75N*3 3P Contactor 100A 600V 110-120
Allen Bradley 100 Ohm 2 W Linear Taper Potentiometer
Allen Bradley Non-Reversing Contactor 9A 100-C09D10
Allen Bradley 100-M09NZ243 CONTACTOR 24V 100-M09N*3
Allen Bradley Non-Reversing Contactors 100-C09D10 Pair
Allen Bradley Contactor 9amp 100-A09NJ3
Allen Bradley AB Starters IEC Bulletin 100-C43D10
ALLEN BRADLEY BREAKER 1492-CB2 G100 10 AMP 2 POLE
Allen Bradley 100-C09DJ10 Contactor 100C09DJ10 NEW
A-B Allen Bradley 1745-DEMO-1 SLC 100 P.C. PLC Trainer
Allen Bradley 100A45NC3 Contactor
5 Allen Bradley Carbon Comp Resistors 100k 1/2W 5%
Allen Bradley 85 Amp Contactor 100-C85D10 Used (3124)
Allen Bradley AB Starters IEC Bulletin 100-C09D10
Allen Bradley Circuit Breaker 1492-CB3H100 NIB (3008)
Allen Bradley 85 Amp Contactor 100-C85D10 Used (3124)
Allen Bradley 100-C12D10 Contactor
Allen-Bradley 100-B11ON*3 Contactor S10
Used/Remanufact?ured Allen Bradley 1336F-BRF100-AN?-EN
ALLEN BRADLEY 1336F DRIVE, 1336F-BRF-100-A?A-EN, PARTS
Allen Bradley 100-C09*10 Control Relays - Lot of 8
Allen-Bradley 100-A09NB3 AC Contactor New in Box!
lot Allen Bradley Contactors 100-C09Z*10
Allen Bradley Lighting Contactor Bul 100L-C20ND4 NNB
Allen Bradley SLC 100 Processor Unit 1745-LP101 PLC
3-ALLEN BRADLEY 100 SERIES CONTACTORS (GOOD CONDITION)
Allen Bradley Contactor 100-C85 85amp 24vdc coil
Allen Bradley SLC 100 150 Trainer Tool Crib Kit 1745PCC
Allen Bradley 100C43*00
Allen Bradley SLC 100 PLC Programmable Controller
ALLEN-BRADLEY 1745-TCAT CONTROL UNIT,SLC-100,15?0,KEY
Allen Bradley 100-B250N*3
Allen-Bradley-M?anual Starter & Contactor-Cat.#?140 &100
Allen Bradley AB Starters IEC Bulletin 100-C09ZJ10
ALLEN BRADLEY 1336F-CWF100-AN?-EN AC DRIVE
ALLEN BRADLEY DRIVE 100-HP 1336F-B100-AA-E?N-HCS2-LA1-L6
ALLEN BRADLEY 100-C43D00 CONTACTOR 115VAC COIL***XLNT**
1492-CB1G100 Allen Bradley 1492CB1G100 1492-CB1-G100
Allen Bradley Safety Contactor 100-D140 100S-D140D22C
Allen Bradley 10A 1-Pole Circuit Breaker 1492-CB1-G100
Allen Bradley 9A Contactor, 100-C09KD10
Allen Bradley 100-A60ND3 Ser. C Contactor 60 amp
Allen Bradley 100-M09N*3 /A 100-M09 Contactor
Allen Bradley 100-C09*10 Contactor S3
ALLEN BRADLEY 100-A09ND3 W/193-A1E1 RELAY
Allen Bradley AB Starters IEC Bulletin 100-C60D10
Allen Bradley Contactor 100-A18ND3 C Relay 193-BSC 10 B
Allen Bradley 100-K09KJ10 Mini Contactor
ALLEN BRADLEY CONTACTOR 100-A24NZ*3 115-VDC NIB
Allen Bradley 100-A18NKD3 AC Contactor Relay; *C2
Allen Bradley 100-FSD250 surge suppressors (2)
Allen Bradley 100k 5% 1/4watt Carbon Comp 50pc
ALLEN BRADLEY A31 MOTOR CONTACTOR AUXILLIARY 100-F
Allen Bradley 100 amp 3P Circuit Breaker 140M-I8 NEW
Allen Bradley 100-C12EJ10 Contactor 24VDC 100C12EJ10
Allen Bradley 100-C23Z*10 30A Motor Contactor C23
ALLEN BRADLEY AB TERMINAL BLOCKS 1492-J3 (LOTS OF 100)
ALLEN BRADLEY CONTACTOR Model 100 C09D
ALLEN BRADLEY 1492GH100 CIRCUIT BREAKER 10AMP 125VAC
ALLEN BRADLEY 100-M05NZ*3 100-M05NZ243 Mini Contactor
ALLEN BRADLEY CONTACTOR 100-B180N3 120V COIL 150HP 600V
ALLEN BRADLEY 100-C12*10 A CONTACTOR 12AMP 240VAC 3-POL
Allen Bradley 10A 2-Pole Circuit Breaker 1492-CB2-H100
ALLEN BRADLEY 1494V-H1 OPERATING HANDLE 30,60,100AMP
ALLEN BRADLEY 100-C37ZJ10 37 AMP 3 POLE CONTACTOR
Allen Bradley 100-A60N*3 60 Amp Contactor A60 Motor
Allen-Bradley 100-C09*10 Contactor
ALLEN BRADLEY Carbon Comp Resistor 100k 2 watt 10% (1)
ALLEN BRADLEY 100-A12ND3 STARTER 193-BSB42 OVERLOAD
1492-GH100 ALLEN BRADLEY SINGLE POLE CIRCUIT BREAKER
ALLEN BRADLEY CONTACTOR 100-A12ND3 OVERLOAD 193-BSB16
Allen Bradley Contactor 100-C09DJ10
Allen-Bradley 1492-CB1 Manual Motor Controller G100
ALLEN-BRADLEY 100 OHM CARBON COMP RESISTORS 50-1/4 Watt
Allen Bradley Contactor 100-MO5N*3 SER A M05 10E (3454)
Allen Bradley 1492-GH100 Series B Style GH AMP Breaker
ALLEN BRADLEY 24 VDC RELAY SERIES B 100-A30NZ 3
Allen Bradley AB Starters IEC Bulletin 100-C30D10
NEW Allen Bradley Contactor 100-C12D10
Allen Bradley Contactor 100-C60D*00 Series B
ALLEN BRADLEY Contactor # 100-C09D10 Ser A - New!
Allen Bradley 100-C72* Contactor 100-C7200
Allen Bradley RCR 100k 5% 1/4watt Carbon Comp 50pc
ALLEN BRADLEY 100 AMP MOTOR CONTACTOR 100-C72*00 C72B00
Allen Bradley 100-A18ND3 Series C Unit
Allen Bradley 100-C12D10 Ser. A Contactor
Allen Bradley 100-C12*10 /A 100-C12 Contactor
ALLEN BRADLEY (1494V-H1) A 100A OPERATING HANDLE NEW
Allen Bradley Contactor 100-A09NZ*3 24VDC w O/relay
ALLEN BRADLEY 100-A09NZ*3 CONTACTOR 9 A 600V 24VDC COIL
ALLEN BRADLEY 194R-NJ100P3 DISCONNECT SWITCH FUSED
ALLEN BRADLEY 100-C30Z D10 100-S B CONTACTOR
Allen Bradley Contactor 100-A09ND3 120/110 VAC (3570)
|
在線咨詢 
在線客服：0571-87774297
