选型注意事项

  S7-300PLC的选型原则是据生产工艺所需的功能和容量进行选型，并考虑维护的方便性、备件的通用性，以及是否易于扩展和有无特殊功能等要求。选型时具体注意以下几方面：

  (1)有关参数确定。一是输入/输出点数(I/O点数)确定。这是确定PLC规模的一个重要依据，一定要根据实际情况留出适当余量和扩展余地。二是PLC存储容量确定。注意当系统有模拟量信号存在或要进行大量数据处理时，其存储容量应选大一些。

  (2)系统软硬件选择。一是扩展方式选择，S7-300PLC有多种扩展方式，实际选用时，可通过控制系统接口模块扩展机架、Profibus-DP现场总线、通信模块、运程I/O及PLC子站等多种方式来扩展PLC或预留扩展口;二是PLC的联网，包括PLC与计算机联网和PLC之间相互联网两种方式。因S7-300PLC的工业通信网络淡化了PLC与DCS的界限，联网的解决方案很多，用户可根据企业的要求选用;三是CPU的选择，CPU的选型是合理配置系统资源的关键，选择时必须根据控制系统对CPU的要求(包括系统集成功能、程序块数量限制、各种位资源、MPI接口能力、是否有

  PROFIBUS-DP主从接口、RAM容量、温度范围等)，并好在西门子公司的技术支持下进行，以获得合理的选型;四是编程软件的选择，这主要考虑对CPU的支持状况，我们的体会是：STEP7V4.0对有些型号的CPU不支持，硬件组态时会发生故障出错，而STEP7V5.0则不存在这种问题。

  二、设计及使用注意事项

  1. 设计注意事项

  设计时主要应注意以下几方面：

  (1)PLC输出电路中没有保护，因此在外部电路中应设置串联熔断器等保护装置，以防止负载短路造成PLC损坏。熔断器容量一般为0.5A。

  (2)PLC存在I/O响应延迟问题，因此在快速响应设备中应加以注意。MPI通信协议虽简单易行，但响应速度较慢。

  (3)编制控制程序时，好用模块式结构程序。这样既可增强程序的可读性，方便调试和维护工作;又能使数据库结构统一，方便WinCC组态时变量标签的统一编制和设备状态的统一显示。

  (4)硬件资源。要合理配置硬件资源，以提高系统可靠性。如PLC电源配电系统要配备冗余的UPS不间断电源，以排除停电对全线运行的不利影响。又如对电机的控制回路要进行继电器隔离，以消除外部负载对I/O模块的可能损坏。另外，系统设备要采用独立的接地系统，以减少杂波干扰。

ABB YB560103-AS DSQC 208A External axis board 
ABB YB560103-AL DSQC 209 Analogue I/O board 
ABB YB560103-AM DSQC 210 Safety board 
ABB YB560103-AN DSQC 211 Power supply 
ABB YB560103-BF DSQC 215 Robot computer 
ABB YB560103-AZ DSQC 220 Programming board 
ABB YB560103-BD DSQC 223 PC Board digital I/O 
ABB YB560103-BE DSQC 224 PC Board combi I/O 
ABB YB560103-BK DSQC 227 Winchester interface 
ABB YB560103-BD DSQC 228 Safety board 
ABB YB560103-BN DSQC 230 Robot computer 
ABB YB560103-BS DSQC 233 External axis board 
ABB YB560103-BY DSQC 235A Rectifier 
ABB YB560103-BZ DSQC 235B Rectifier 
ABB YB560103-CA DSQC 236A Drive unit 
  DSQC 236B Drive 
ABB YB560103-CC DSQC 236C Drive unit 
ABB 3HAB2207-1 DSQC 236D Drive unit 
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ABB 3HAB2245-1 DSQC 236H Drive unit 
ABB 3HAA3563-AJA DSQC 236P Drive unit 
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  DSQC 239 Board - ABB RIO 
ABB  DSQC 241 Power supply 
ABB YB560103-CM DSQC 242 Programming board 
ABB 3HAA0001-CP DSQC 243 Serial measurement board 
ABB 3HAA3563-ACA DSQC 245 Serial measurement board 
ABB 3HAA3563-AAA DSQC 248 Programming board 
ABB 3HAA3563-AGA DSQC 249A Rectifier 
ABB 3HAA3563-AHA DSQC 249B Rectifier 
ABB 3HAA3563-AD DSQC 252 System board 
 E3HAC028756-001 DSQC 253 SMB unit DSQC 573 
 E3HAA3563-AMA DSQC 253 Serial Measurement Board 
 E3E 042816 DSQC 253 Exch. Serial mes. DSQC 253W 
 6369901-218 DSQC 253 Serial Measurement Board 
ABB 3HAB2211-1 DSQC 256A System board 
ABB 3HAA3563-AUA DSQC 258 Power supply 
ABB 3HAB8797-1 DSQC 266B Drive unit 
ABB 3HAB8798-1 DSQC 266C Drive unit 
ABB 3HAB8801-1 DSQC 266G Drive unit 
ABB 3HAB8800-1 DSQC 266H Drive unit 
ABB 3HAB8799-1 DSQC 266K Drive unit 
ABB 3HAB8802-1 DSQC 266T Drive unit 
ABB 3HAA3573-AAA DSQC 300 Board - Computer 
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ABB 6369901-380 DSQC 300 Board - Computer 
ABB 3HAA3573-ABA DSQC 301 Programming board 
ABB 3HAB2209-1 DSQC 306 Computer board 
ABB 6369901-298 DSQC 306 Computer board 
ABB E3HAB2209-1 DSQC 306 Computer board 
ABB 3HAB3700-1 DSQC 313 Serial measurement board 
ABB 3HAB4259-1 DSQC 313 Serial measurement board 
ABB 3HAC9522-1 DSQC 313 Serial Measurement Board 
ABB 3HAB2215-1 DSQC 314A Rectifier 
ABB 3HAB2216-1 DSQC 314B Rectifier 
ABB 3HAB2231-1 DSQC 314C Rectifier DC link 
ABB 6369901-336 DSQC 314C Rectifier DC link 
ABB E3HAB2231-1 DSQC 314C Rectifier DC link 
ABB 3HAB2214-1 DSQC 315 Combi I/O 
ABB 3HAB2219-1 DSQC 316 Computer board 
ABB 3HAB2209-1 DSQC 317 Memory expansion board 
ABB 3HAB2233-1 DSQC 322 Robot computer 
ABB 3HAB5956-1 DSQC 323 Memory expansion board 
ABB 3HAB5957-1 DSQC 324 Memory expansion board 
ABB 3HAB2241-1 DSQC 325 Main computer 
ABB 3HAB2242-1 DSQC 326 Robot computer 
ABB 3HAB7230-1 DSQC 327 Analogue Digital Combi I/O 
ABB 3HAB7229-1 DSQC 328 Digital 24 VDC I/O 
ABB 3HAB7215-1 DSQC 331 Panel unit 
ABB 3HAC17973-1 DSQC 332 Digital relay I/O 
ABB 3HAB5845-1 DSQC 334 Power supply 
ABB 3HAB6182-1 DSQC 335 Robot computer 
ABB 3HNE00001-1 DSQC 336 Network board NIOC-01 
ABB 3HAB8101-1 DSQC 345A Rectifier 
ABB 3HAB8101-2 DSQC 345B Rectifier 
ABB 3HAB8101-3 DSQC 345C Rectifier 
ABB 3HAB8101-4 DSQC 345D Rectifier 
ABB 3HAB8101-14 DSQC 345E Rectifier 
ABB 3HAB8101-5 DSQC 346A Drive unit 
ABB 3HAB8101-6 DSQC 346B Drive unit 
ABB 3HAB8101-7 DSQC 346C Drive unit 
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ABB 3HAB8101-8 DSQC 346G Drive unit 
ABB 3HAB8101-13 DSQC 346U Drive unit 
ABB 3HNE00957-1 DSQC 350 Remote I/O 
ABB 3HNE00065-1 DSQC 354 Encoder interface 
  DSQC 355 I/O Board 
ABB 3HAB8101-10 DSQC 358C Drive unit / Rectifier 
ABB 3HAB8101-12 DSQC 358E Drive unit / Rectifier 
ABB 3HAB8101-15 DSQC 358F Driveunit / Rectifier 
ABB 3HAB8101-16 DSQC 358G Drive unit / Rectifier 
ABB 3HAC0373-1 DSQC 361 Main computer 
ABB 3HAC1462-1 DSQC 363 Robot computer 
ABB 3HAC1620-1 DSQC 365 Power supply 
ABB 3HAC3180-1 DSQC 373 Robot computer 
ABB 3HAC3462-1 DSQC 374 Power supply 
ABB 3HAC10597-1 DSQC 386 Devicenet gateway 
ABB 3HAC3616-1 DSQC 500 Main computer 
ABB 3HAC3619-1 DSQC 503 Axis computer 
ABB 3HAC4297-1 DSQC 506 Power supply 
ABB 3HAC5393-2 DSQC 508 Battery unit 
ABB 3HAC5687-1 DSQC 509 Panel unit 
ABB 3HAC7519-2 DSQC 518A Flash disk 64Mb 
ABB 3HAC7519-3 DSQC 518B Flash disk 128Mb 
ABB 3HAC8848-1 DSQC 522 I/O computer board 
ABB 3HAC12158-1 DSQC 532 I/O Computer 
ABB 3HAC14265-1 DSQC 539 Power supply 
ABB 3HAC14279-1 DSQC 540 Main computer 
ABB 3HAC16917-3 DSQC 544A Flash disk 64Mb 
ABB 3HAC16917-4 DSQC 544B Flash disk 128Mb 
ABB 3HAB8101-19 DSQC 545A Rectifier 
ABB 3HAB8101-18 DSQC 546A Drive unit 
ABB 3HAC17396-1 DSQC 562 Serial measurement board 
ABB 3HAC022104-001 DSQC 564A Flash disk 64Mb 
ABB 3HAC022104-002 DSQC 564B Flash disk 128Mb 
ABB 3HAC020466-1 DSQC 627 Power supply 
ABB 3HAC025918-001 DSQC 653 Digital relay 
ABB 3HAC025465-004 DSQC 656 Flash disk 256Mb 
ABB YB560103-BD DSQC223 I/O Card  
ABB YB560103-BL DSQC228  
ABB YB560103-CA DSQC236A DriveUnit  
ABB 3HAA 3562-AGA/2 DSQC249A PowerUnit  
ABB 3HAA 3563-ALA/2 DSQC252  
ABB 3HAB 2211-1/1 DSQC256A  
ABB 3HAB2213-1/3 DSQC313  
ABB 3HAB6372-1 DSQC330 S4C Rechner Rack 
ABB 3HAB7215-1/07 DSQC331 S4C Safety Board 
ABB cable DSQC352 Profibus 
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ABB YB161100-DP DSQS 174 Teach pendant S2 
ABB YB161100-DR DSQS 174 Teach pendant S2 
ABB 48990001-FE DSSR 115 Power supply 
ABB 48990001-FK DSSR 116 Power supply 
ABB 3HAC023195-1 Flexpendant Teach pendant IRC5 
ABB 6397103-GA IRB1000 Wrist 
ABB 3HAC7842-1 IRB140 Motor 
ABB 3HAC7866-1 IRB140 Motor 
ABB 3HAB3125-1 IRB1400 Motor 
ABB 3HAB3388-1 IRB1400 Wrist 
ABB 3HAC021458-1 IRB1400 / IRB2400 Motor 
ABB 3HAA2120-1 IRB1500 Motor 
ABB 3HAA2465-1 IRB1500 Gear 
ABB 3HAA2596-2 IRB2000 Lower cable 
ABB 3HAA2609-2 IRB2000 Bellow cables 
ABB 3HAB3016-1 IRB2000 Lower c