FURNAS ELECTRIC CO 3SB3-500-0AA21
FURNAS ELECTRIC CO 3SB3-500-0AA21
SIEMENS 6ES7-408-1TA01-0xA0
RELIANCE ELECTRIC 57C-402
AB 系列 优势1746 1756 1770
1771 1747 1336 PLC 系列触摸屏 2711系列。
西门子 6ES7-300 6DD 6FC 6SC 6GK系列。
FANUC A06B A20B A02B 驱动系列。
ABB DSQC 示教器 系列。
施耐德 140系列 PLC CPU 系列。
安川模块伺服控制器。
GE IC693 IC697 系列。
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对于用户来说,在编写用户程序或选择设备时,必须清楚下面介绍的三个阶段,即用户程序执行过程的原理。
PLC采用集中处理的方法,即对输入扫描信号、执行用户程序和输出刷新都采用集中分批处理的工作方式。
输入扫描 在这一阶段中,PLC以扫描方式读入所有输入端子上的输入信号,并将输入信号存入输入映像区,输入映像存储器被刷新。在程序执行阶段和输出刷新阶段中,输入映像存储器与外界隔离,其内容保持不变,直至下一个扫描周期的输入扫描阶段,才被重新读入的输入信号刷新。可见,PLC在执行程序和处理数据时,不直接使用现场当时的输入信号,而使用本次采样时输入到映像区中的数据。如果输入设备能使PLC输入端形成闭合回路,对应输入端编号的内部输入继电器内保存为“1”,即相当于继电器线圈导通。在程序执行过程中,该编号对应的触点动作;如果输入设备能使输入开路,则对应输入端编号的内部输入继电器内保存为“0”,即相当于继电器线圈没导通,在程序执行过程中,该编号对应的触点不动作。如果在PLC处于非输入扫描的阶段,PLC外的输入设备状态发生了变化,内部输入继电器也不会发生变化,要等到下一个输入扫描阶段才能根据此时的输入状态来刷新。所以,对于少于十几毫秒的输入信号,经常采集不到。
在程序执行过程中,同一周期内,前面的逻辑结果影响后面的触点,即后执行的程序可能用到前面的**中间运算结果;但同一周期内,后面的运算结果不影响前面的逻辑关系。该扫描周期内除输入继电器以外的所有内部继电器的**终状态(导通与否),将影响下一个扫描周期各触点的开与闭。
(3)输出刷新 程序执行阶段的运算结果被存入输出映像区,而不送到输出端口上。在输出刷新阶段,PLC将输出映像区中的输出变量送入输出锁存器,然后由锁存器通过输出模块产生本周期的控制输出。如果内部输出继电器的状态为“1”,则输出继电器触点闭合。全部输出设备的 。
ITE SIEMENS TA6FG04 USPP TA6FG04
WESTINGHOUSE 1640A03G01 USPP 1640A03G01
FURNAS ELECTRIC CO 3SB3-500-0AA21
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NORDIC ConTROLS 72HD35AFA USPP 72HD35AFA
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SICK OPTIC ELECTRonIC DOS-1204-W NSPP DOS1204W
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DODGE 022195 NSFP 022195
DODGE 1610-1/2 NSPP 161012
ALLEN BRADLEY 100-B600ND3 USPP 100B600ND3
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ALLEN BRADLEY 194E-A32-1753 FNFP 194EA321753
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BANNER ENGINEERING E124588 USPP E124588
BANNER ENGINEERING Q12AB6FF50 FNFP Q12AB6FF50
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GUARDMASTER LTD 440N-A32005 USPP 440NA32005
PHOTOSWITCH 889N-R5AF-12F NSFP 889NR5AF12F
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WESTINGHOUSE A211K2CA USPP A211K2CA
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WESTINGHOUSE L-53 NSFP L53
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FURNAS ELECTRIC CO 10C41 NSFP 10C41
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FURNAS ELECTRIC CO 3RV1021-1AA10 USPP 3RV10211AA10
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FURNAS ELECTRIC CO 52PA6J2A NSFP 52PA6J2A
ITE SIEMENS 4AM8195-0UA00-0N USPP 4AM81950UA000N
ITE SIEMENS GB10 USPP GB10
MOORE PRODUCTS 15756-8-2 USPP 1575682
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SIEMENS C8451-A14-A5-4 NSFP C8451A14A54
DATAMETRICS U0500-12LD-2 USPP U050012LD2
SICK OPTIC ELECTRonIC IM12-04NPS-ZC1 NSFP IM1204NPSZC1
SICK OPTIC ELECTRonIC WE2S-F213 USPP WE2SF213
STEGMANN DGS60-A4M00500 NSPP DGS60A4M00500
DODGE 1240-66 NSPP 124066
DODGE B71 NSPP B71
ALLEN BRADLEY 1336-MOD-EAD NSPP 1336MODEAD
ALLEN BRADLEY 1492-EAHJ-35 NSPP 1492EAHJ35
ALLEN BRADLEY 1734-OB8S NSFP 1734OB8S
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FURNAS ELECTRIC CO 3SB3-500-0AA21
ALLEN BRADLEY 22F-D1P5N103 USPP 22FD1P5N103
ALLEN BRADLEY 6181P-2P2KH USPP 6181P2P2KH
ALLEN BRADLEY 800EQ-P7 FNFP 800EQP7
ALLEN BRADLEY 800MR-NH2QB NSFP 800MRNH2QB
ALLEN BRADLEY 800T-QH10G NSPP 800TQH10G
ALLEN BRADLEY 900211 USPP 900211
BANNER ENGINEERING BRT-THG-2-100 FNFP BRTTHG2100
BANNER ENGINEERING PBB USPP PBB
BANNER ENGINEERING SC22-3E-C NSFP SC223EC
GUARDMASTER LTD 440E-L13043 NSFP 440EL13043
PHOTOSWITCH 889D-F4AE-5 FNFP 889DF4AE5
WESTINGHOUSE 1314986 NSPP 1314986
WESTINGHOUSE 3001862 USPP 3001862
WESTINGHOUSE 493A562G02 USPP 493A562G02
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WESTINGHOUSE BR120R USPP BR120R
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FURNAS ELECTRIC CO 3SB3-500-0AA21
WESTINGHOUSE I289378 USPP I289378
WESTINGHOUSE OT1D1 NSFP OT1D1
WESTINGHOUSE WL36081 NSFP WL36081
FURNAS ELECTRIC CO 3RT1316-2BB40 NSFP 3RT13162BB40
FURNAS ELECTRIC CO 3TC4817-0AG4 NSFP 3TC48170AG4
FURNAS ELECTRIC CO 48JA18AA2R NSFP 48JA18AA2R
FURNAS ELECTRIC CO MT2000I NSFP MT2000I
ITE SIEMENS EF3-M040 NSPP EF3M040
LANDIS & GYR PPM-1U32.BPR NSFP PPM1U32BPR
SIEMENS 3RX8000-0CE45 FNFP 3RX80000CE45
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TEXAS INSTRUMENTS PLC 500-5047A USPP 5005047A
SICK OPTIC ELECTRonIC FGSE-750-111 USPP FGSE750111
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SICK OPTIC ELECTRonIC UE43-4AR3D2 NSPP UE434AR3D2
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DODGE 119604 NSFP 119604