问：西门子plc如 s7200 s7300  s7400 还有新出的s71200。请问各位高手在实际应用中选择这些plc的主要标准是什么？

答：      在PLC系统设计时，首先应确定控制方案，下一步工作就是PLC工程设计选型。工艺流程的特点和应用要求是设计选型的主要依据。PLC及有关设备应是集成的、标准的，按照易于与工业控制系统形成一个整体，易于扩充其功能的原则选型所选用PLC应是在相关工业领域有投运业绩、成熟可靠的系统，PLC的系统硬件、软件配置及功能应与装置规模和控制要求相适应。熟悉可编程序控制器、功能表图及有关的编程语言有利于缩短编程时间，因此，工程设计选型和估算时，应详细分析工艺过程的特点、控制要求，明确控制任务和范围确定所需的操作和动作，然后根据控制要求，估算输入输出点数、所需存储器容量、确定PLC的功能、外部设备特性等，最后选择有较高性能价格比的PLC和设计相应的控制系统。 
    一、输入输出（I/O）点数的估算 

    I/O点数估算时应考虑适当的余量，通常根据统计的输入输出点数，再增加10%～20%的可扩展余量后，作为输入输出点数估算数据。实际订货时，还需根据制造厂商PLC的产品特点，对输入输出点数进行圆整。 
    二、存储器容量的估算 

    存储器容量是可编程序控制器本身能提供的硬件存储单元大小，程序容量是存储器中用户应用项目使用的存储单元的大小，因此程序容量小于存储器容量。设计阶段，由于用户应用程序还未编制，因此，程序容量在设计阶段是未知的，需在程序调试之后才知道。为了设计选型时能对程序容量有一定估算，通常采用存储器容量的估算来替代。 

    存储器内存容量的估算没有固定的公式，许多文献资料中给出了不同公式，大体上都是按数字量I/O点数的10～15倍，加上模拟I/O点数的100倍，以此数为内存的总字数（16位为一个字），另外再按此数的25%考虑余量。 

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KA78L08ADTFFAIRCHILD

TM1S4-CPANDUIT

110-91-316-41-605000PRECI-DIP

MT58LC64K32B3LG-10MICRON TECHNOLOGY,INC

74AUP1G34GFNXP SEMICONDUCTORS

ABM7-14.7456MHZ-D2Y-TABRACON

AD9767ASTZRLANALOG DEVICES

HLMP-EG24-PS000-QAVAGO TECHNOLOGIES

LST670K2-1-0R18OSRAM OPTO

XC6401EE35MRTOREX SEMICONDUCTOR

HCF4040M013TRST MICROELECTRONICS SEMI

DPA422PNPOWER INTEGRATIONS

BT137500PHILIPS

HLMP-DL15HEWLETT PACKARD

74ACT534SJFAIRCHILD

BC846AWT1MOTOROLA

74LCXR2245MTCXFAIRCHILD

HSP43220VC-25HARRIS

RK73H2BLTD2743FKOA

KSP44TFFAIRCHILD

98424-G52-12ALFFCI ELECTRONICS

SMM0204-MS1256K8.1%BEVISHAY

ST485BNST MICROELECTRONICS SEMI

MMBT5551-NLFAIRCHILD

MIC2568-1BTSMICREL

ISL9203CRZ-TR5220INTERSIL

2T61-190-1110-AFFOXCONN ELECTRONICS

NLU2G06MUTCGON SEMICONDUCTOR

CRCW12061500F100RT5VISHAY

PCF8577CTPHILIPS

SK025M0010A2F-0511YAGEO

LM258DTST MICROELECTRONICS SEMI

MAX2682EUT+TMAXIM

63246-0050NFRAMATOME CONNECTORS

DS1743P-100DALLAS

LMH6550MAXNATIONAL SEMICONDUCTOR

TIBPAL16L8-15CFNTEXAS INSTRUMENTS

CEA470025DUBILIER

MC74HCT573ADWR2ON SEMICONDUCTOR

RS26.2K5%RSTACKPOLE ELECTRONICS INC.

IC63LV1024-15TINTEGRATED CIRCUIT SOLUTION

MC7805ABD2TON SEMICONDUCTOR

PTCLL05P101KTE052VISHAY

RK73H1ETTP4021FKOA

BCP56NXP SEMICONDUCTORS

SC4905AIMSTRSEMTECH

TC74HC273AF(EL,F)TOSHIBA

T491D107M010AS7454KEMET

TC74ACT32FNTOSHIBA

223-000312-20-LF-TROSCILENT CORPORATION

57102-G08-07FCI ELECTRONICS

74HC4051D-TNXP SEMICONDUCTORS

1N4004GPHILIPS

B81131C1684MEPCOS

2N3906RLRAMOTOROLA

MBR0530-TPMICRO COMMERCIAL COMPONENTS

TDSL1160TELEFUNKEN

LT1573CS8-2.5LINEAR TECHNOLOGY