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鼎晟达自动化 SIEMENS R15C02-A185

日期:2020-6-17 类别: 阅读:118 (来源:互联网)
公司:
漳州鼎晟达自动化设备有限公司
联系人:
叶雨梦
手机:
18150708278
电话:
18150708278
传真:
086-0596-3119658
QQ:
2880842793 和我即时交谈
地址:
绥安镇金浦路中段东侧金浦花园1幢302

一、前言

 当前,可编程控制器(PLC)作为一种成熟稳定的控制器,以卓越的稳定性、可靠性、抗干扰性和编程简单、容易掌握等特点在工业控制领域得到了越来越广泛的应用。在控制系统中,PLC作为主控设备,与控制对象中的各种输入信号(如:按钮、接近开关、编码器等检测信号)和输出设备(如继电器线圈、电磁换向阀等执行元件)相关联,随着控制系统的复杂程度和控制设备增多,PLC需要的输入输出点数也大量增加,这就有必要通过采用各种方法对I/O点进行优化,来减少系统占用I/O点数使用数量,提高I/O的利用率,降低硬件使用成本,下面以西门子PLC为例从软件和硬件两个方面进行探讨。

   二、软件方法

   1. 单按钮控制启动/停止

   通常情况下,PLC控制的外部设备至少要有一个启动和一个停止按钮作为输入信号来控制程序的运行和停止,因此至少需要两个输入点,在点数紧张的情况下可采用单按钮控制进行优化,将节省下的点留作扩展功能。

   图1为PLC的外部接线,SBl接输入I0.0,Q0.0接继电器输出,通常情况下,继电器应反向并联一个二极管。

   图2中,输入信号I0.0第一次短暂闭合,在正向脉冲指令下,辅助继电器M0.0输出一个周期的脉冲,则使网络3接通,输出Q0.0并实现自锁,输入信号I0.1第二次闭合,则网络2接通,使辅助继电器M0.1接通,常闭点M0.1打开,使网络3断开,输出Q0.0停止输出。

   除了上述的方法外还可以采用计数器,R/S指令,寄存器等方法实现。图3为采用R/S指令方式的方法。

  2. 典型问题和解决方法

   在实际运用的过程中,如果对PLC的运行原理不了解或理解的不够透彻,那么在程序的编写上很容易出现问题,左图也为单按钮实现启动/停止的梯形图,但在实际的调试中确是不可行的,达不到为我们预期的效果,通过与图2的对比我们发现:在网络1上少一个正向脉冲指令,这个指令是关键。这样我们就清楚问题的所在:由于I0.0.接通的时间比一个扫描周期的时间长,有时为N个或N+1个,要达到我们的目的必须每次都是奇数才可以,所以导致调试时的不成功,因此加一个正向脉冲指令可解决这个问题。同样如果将图2中网络2和网络3颠倒,其结果是Q0.0没有输出,原因是:在一个扫描周期内,网络2和网络3先后接通,然后将运算结果存人映像寄存器当中,所以就不会有任何的输出。

   在R/S方法中,容易出现的问题是锁存器的R/S端不能采用图5这种结构,系统会提示错误,所以只能是图2中的结构,才能正确执行。

   上述是用单触点实现启动/停止方法中比较常见的典型问题,尤其是初学者容易出现,这些问题虽然不大,但往往都是关键,如果在设计和调试中考虑到这些因素的存在,那会减少错误和缩短调试的周期。

   三、硬件方法

   1. 优化输入点数

   在某些应用场合下有“自动控制/手动控制”的要求,并且在运行过程中,自动和手动不会同时进行,这样就可以将自动和手动按照不同的控制状态分组接入PLC输入端,可减少输入点,提高输入点的利用率,图6中的示例节省了50%的I点,相当于输入点数扩充了一倍。

   其中SA为手动/自动切换开关,SBl,SB2,SB3为一组输入,SBl0,SB20SB30为一组输入。

   在某些联锁情况下,如果PLC内部不采集该触点信号的状态,可采用物理联锁的方式进行,即硬件连接上进行联锁(不必每一个开关量都接到PLC的输入端),也可在一定程度上减少输入点数。

   2. 优化输出点数

   除了优化输入点数外还可优化输出点数,对系统整个运行过程中,输出状态完全一样的执行元件可以采用并联的方式,但要注意负载的功率情况,通常情况下采用继电器加续流二极管。此外还可以采用三八线译码器等方法,但需采用外部元器件,操作略微复杂一些。

   四、结论

   上述的几种方法虽然比较简单,但切实可行并且容易掌握,在不同的PLC中实现的途径略微不同,但基本思路都是一致的,通过对系统的优化可以进一步提高I/O的利用率,节省输入和输出点的数量,减少PLC的体积,降低硬件成本,具有很高的实用价值。

        咨询热线:18150708278

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漳州鼎晟达自动化设备有限公司      

联系人     黄漳文                                          

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【主营产品】

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2:Invensys Triconex: 冗余容错控制系统、基于三重模件冗余(TMR)结构的最现代化的容错控制器。


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5:Schneider Modicon(施耐德莫迪康):Quantum 140系列处理器、控制卡、电源模块等。


6:ABB:工业机器人备件DSQC系列、Bailey INFI 90等。


7:Siemens(西门子):Siemens MOORE, Siemens Simatic C1,Siemens数控系统等。


8:Motorola(摩托罗拉):MVME 162、MVME 167、MVME1772、MVME177等系列。


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HT7133-1(SOT25)HOLTEK

CM453232-681JLBOURNS

RMC1/1640.21%RSTACKPOLE ELECTRONICS INC.

IRF7907PBFINTERNATIONAL RECTIFIER

CRCW0603681RFKTAVISHAY

MAX6315US45D3-TMAXIM

CRCW120639R2FKEAVISHAY

SN74LVC126ADRE4TEXAS INSTRUMENTS

UPD72852GB-8EUNEC ELECTRONICS

ISL6605CRZINTERSIL

BZV85-C6V8PHILIPS

HSMB-C112(J,A)AGILENT

MC33269DTRK-3.3ON SEMICONDUCTOR

CXA120417411375OTHER

LP3985IM5X-4.7NATIONAL SEMICONDUCTOR

W19B323MBB9GWINBOND

HDLG-2416AVAGO TECHNOLOGIES

SSTUB32865ET/GPHILIPS

MAX6302CPAMAXIM

LS10166R12-4S6PYLE NATIONAL CONNECTOR PRODS.

MIC2211-FOBMLTRMICREL

C2012Y5V1C105ZTTDK

TLC072CDRTEXAS INSTRUMENTS

1001AS-6R8M-P5TOKO

EPF10K50VRC240-1NALTERA

MIC371939-1.8BSTRMICREL

MIC5209-5.0YMTRMICREL

HEF4016BTD(TSTDTS)NXP SEMICONDUCTORS

PCA9564BSPHILIPS

PTH12060WADASTEC

MC-15632.768000KA-A0EPSON

MV8AG31(T)FAIRCHILD

DDTC124TCA-7DIODES INC.

ICS8521AYI-03INTEGRATED CIRCUIT SYSTEMS

DF3A6.8FE(TPL3,F)TOSHIBA

104068-4AMP

MAX931CUA-TMAXIM

RK73H2ALTD5622FKOA

RNC55H1001FSDALE

MC14050BDTON SEMICONDUCTOR

MAX4238ASAMAXIM

V120ZT1PLITTELFUSE

CRCW080531R6F100RT1VISHAY

24LC024T-I/MSMICROCHIP

HUF76131SK8FAIRCHILD

MJF31CON SEMICONDUCTOR

CTV07RW-25-61SAMPHENOL

PDTA124XTPHILIPS

HIN208ECAINTERSIL

1N5988AMOTOROLA

KA78R09TUSAMSUNG

FDG6322CFAIRCHILD

04023C101MAT2AKYOCERA

1N5625GENERAL SEMICONDUCTOR

DAN222TLROHM

CY62128DV30LL-70SICYPRESS

GRM188R60J225KE01MURATA

IDT7025L25FBIDT

SN75C189ADRTEXAS INSTRUMENTS

AD421BRANALOG DEVICES

CD74HCT166MG4TEXAS INSTRUMENTS

MF0207FTE52-1M8YAGEO

MD2114AL-4INTEL

MIC5207-3.3BM5TXMICREL

LFNFN0085872OTHER

R2E225AR0517EBM/PAPST

ZTX757ZETEX

74HC377DWNXP SEMICONDUCTORS

XR16V698IQ100-FEXAR

66169-109DUPONT

2PD602ARPHILIPS

CPD68HC68T1MHARRIS

LTC3728LEGN#TRPBFLINEAR TECHNOLOGY

F930J476MAANICHICON

TL084CDG4TEXAS INSTRUMENTS

ISP2200A/33Q-LOGIC

IS24C16A-2ZLI-TRINTEGRATED SILICON SOLUTION

LM339APTST MICROELECTRONICS SEMI

2SK354700LPANASONIC

SN74F161ANTEXAS INSTRUMENTS

PI5C3253CLEXPERICOM SEMICONDUCTOR CORP

CY62147EV30LL-45BVITCYPRESS

CRCW0805169RFKEAVISHAY

LMK325BJ475KD-TTAIYO YUDEN

UF4001GENERAL INSTRUMENT

MC74AC240DWR2ON SEMICONDUCTOR

SG-615PH410000MHZCEPSON

1755794PHOENIX CONTACT

74HC4052DNXP SEMICONDUCTORS

FR1ADIOTEC SEMICONDUCTOR

1-1734795-1AMP

L717DFE09POL2RM8AMPHENOL

74ACT258SJFAIRCHILD

74VHC541TTRST MICROELECTRONICS SEMI

84534-9AMP

LPC3141FET180NXP SEMICONDUCTORS

AT27C020-55PIATMEL CORPORATION

FPP2-45-4.0/B(TSTDTS)TIMONTA

QG82910GML(SL8G8)INTEL

NRSA221M63V10X20TBFNIC COMPONENTS

TLV1117IKTERTEXAS INSTRUMENTS

ISP2100A33Q-LOGIC

RLR05C3921FSVISHAY

MCP73828-4.2VUATRMICROCHIP

3007W2SCR52F40XCONEC

ERJ2RKF9531XPANASONIC

XC2C256-7FT256CXILINX

74AHCT273PWNXP SEMICONDUCTORS

MM5Z4V7T1GON SEMICONDUCTOR

SBL1640CTGENERAL SEMICONDUCTOR

B009-P33-01-TCORNING GILBERT

LFNFP0730563OTHER

DLP05LC-7DIODES INC.

RNC70H28R7FRVISHAY

IRFR9120TRSILICONIX

CSM4R7M1HD05WJAMICON

V800ME05Z-COMMUNICATIONS INC

G781-1GLOBAL MIXED-MODE TECH. INC

2-640383-2AMP

SN74LV4052APWRTEXAS INSTRUMENTS

SR106DIODES INC.

SSW-110-02-SM-D-RASAMTEC

RK73H2AT1652FKOA

B37931K5222K60EPCOS

KM49C512BLJ-7SAMSUNG

CM05CG9R0D50AHKYOCERA

SMAJ6.5CA-13DIODES INC.

AT24C04-10TC-2.7ATMEL CORPORATION

QLMP-AL86-SS4DDAGILENT

74LV14D-TPHILIPS

FIN1532MXFAIRCHILD

700261340OTHER

MB87L6060PVSR-G-BNDE1FUJITSU

NC7SZ86P5XFAIRCHILD

C1608C0G1H221JTTDK

LT1236AIS8-5#TRLINEAR TECHNOLOGY

PS2701-1-F3-ARENESAS

MC74HCT14AFELON SEMICONDUCTOR

VE09M00421KTHOMSON CSF PASSIVE COMPONENTS

RC1608F511CSSAMSUNG ELECTRO-MECHANICS

CD4022BEHARRIS

1N5252BTRFAIRCHILD

ICS9FG1200DG-1LFTINTEGRATED CIRCUIT SYSTEMS

MIC5247-2.0YD5TXMICREL

NRC10J301TRNIC COMPONENTS

PI6C180VXPERICOM SEMICONDUCTOR CORP

FYP1010DNTUFAIRCHILD

MAX17140ETL+TMAXIM

RMCF1/8130K5%RSTACKPOLE ELECTRONICS INC.

BZX84C18W-7DIODES INC.

T491A335M010ATKEMET