对端口数据的判断属于判错的内容，如果数据有错的话，对外的执行都靠它来实现，一旦出现问题，执行后的后果就不可控了，周总理说过“外交无小事”。但如何注意呢对输出的数据的可能后果要进行预防性设计，数据输出的过程，我们从设计上要做一个分析，分析的思路是一般容易局限在稳态过程，忽视了过渡过程。举例说明，比如我们控制一个支路的供电，从软件控制来说，直接给继电器一个启动信号，让开状态的触点闭合就可以了，非“关”即“开”，是受控继电器的两个稳态状态，但事实上，在从开到闭合的过程中，支路供电的电压并不是一个简单0V—24V(24V为示例而已)的跳变状态，而是一个抖动，有冲击信号的过程
Festo CMMP-AS-C2-3A
Siemens Simatic 6 6 671- E00-0AX0
MITSUBISHI FX727D/FX27D BN624A93IG52
Siemens Sinumerik 6FC5235-0AA05-0AA1
ABB 3BSC980002R277+3BSC980051R42
Jumo 703570/091-1100
VEM Motors B21R 90 L4
Siemens 6ES7 153-2BA01-0xB0
B khoff CX1100-0900
Heidenhain VRZ 613
Rexroth 4WRA 6 E15-22/G24K4/V-589
Airwell 467300344R 01
Siemens 6ES7 153-2BA02-0xB0
Siemens C98043-A1002-L3
Siemens 6ES7151-3BA23-0AB0
Siemens 6SE6440-2UD17- A1
Festo SPC-100-M-F 157653 H807
Heidenhain Suspension 650 50 Pocket 277 236-71
Festo SPC-100-M-F 157653 JD07
Elco 3FGB 195-50-5V/4
Siemens 6ES7 322-1HH01-0AA0
Siemens 6ES7 315-2AF03-0AB0
Rice 7636.100.6
Siemens Simtatic S5 6ES5928-3UB12
Airwell 467300184R
Sick C40S-0604CA010 + C40E-0604CA010
Rice 7636.100.6
Dresden Antriebst hnik DSM4-07.2-N6-6TD
Airwell 467300323R 03
Airwell 467300323R 01
Testo 0555.6743
Siemens 6ES7 972-0CB35-0xA0
Denison VP01 51B Hydraulic Valve 0048016-001
Sick WS45-P260
Salvagnini UNI02
Siemens 6SN1113-1AB01-0BA1
ABB DSQC 504 3HAC5689-1/04
Siemens (DIN-41752)
Berger Lahr vrdm 568/50
CLOOS 033.53.18.99
CLOSS 033.53.63.00
Siemens 6FC3471-1AA-Z 810M
Siemens 6FX1818-1BX13-4B 6FX1818-1BX12-3A
Airwell 467300186R
Airwell 467300322R
Festo DNC-125-25-PPV-A 163497 A108
Airwell 467300275R
Pilz PNOZ m EF 8D14D0 772142
Airwell 467300344R
Airwell DCI 4-5HP
Airwell 467300323R
Siemens 6ES7 151-1CA00-0AB0
Binzel EBA0303
Burster 86412-5020
Airwell 467300037R
Fischer Porter D358E280U01
Indramat 109-0595-4801-00
WIKA 891.09.1968
CLOOS 033.53.18.00
AEW Control 1000
CLOOS 033.53.18.99-B
CLOOS 033.53.23.99
Binzel RV EBA0307
Airwell 467300258R 02 HAD18
Siemens 1LA7083-2AA10-Z
EMOD 90S/4
Airwell DCI 6HP Capacitor BD 467300342R
Siemens 1PF9099-4ZZ99-ZN04 UD 0307/2137409-30
Siemens 6XV1440-4AH50
BALLUFF M hanical Cam Switch BNS 819-B04-R08-46-11
Siemens 6SN1113-1AB01-0BA1
Siemens 6ES7 313-5BF03-0AB0
IFM PSU AC1207
Siemens SimaticS7 6ES7421-1BL01-0AA0
Sew Eurodrive RF47 DRS71M4
Rofin-Sinar PCB670-4/02.01
Rofin-Sinar lascon PCB670-4/02.01
Rittal SK3214.100
Jumo GmbH & Co. KG 703570/091-1100-111150-23-00/03,056
Siemens Simatic S5 6ES5451-7LA11
Allen-Bradley 1606-XL960E-3
Bonfiglioli Riduttori Motor BE100LA4
ABB DSQC 361 3HAC0373-1