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（1）PLC的工作方式：采用循环扫描方式。在PLC处于运行状态时，从内部处理、通信操作、程序输入、程序执行、程序输出，一直循环扫描工作。

注意：

由于PLC是扫描工作过程，在程序执行阶段即使输入发生了变化，输入状态映象寄存器的内容也不会变化，要等到下一周期的输入处理阶段才能改变。循环扫描过程如下：

（2） 工作过程：主要分为内部处理、通信操作、输入处理、程序执行、输出处理几个阶段。

1） 内部处理阶段：

在此阶段，PLC检查CPU模块的硬件是否正常，复位监视定时器，以及完成一些其它内部工作。

2） 通信服务阶段

在此阶段，PLC与一些智能模块通信、响应编程器键入的命令，更新编程器的显示内容等，当PLC处于停状态时，只进行内容处理和通信操作等内容。

3） 输入处理

输入处理也叫输入采样。在此阶段顺序读入所有输入端子的通断状态，并将读入的信息存入内存中所对应的映象寄存器。在此输入映象寄存器被刷新，接着进入程序的执行阶段。

4） 程序执行

根据PLC梯形图程序扫描原则，按先左后右，先上后下的步序，逐句扫描，执行程序。但遇到程序跳转指令，则根据跳转条件是否满足来决定程序的跳转地址。若用户程序涉及到输入输出状态时，PLC从输入映象寄存器中读出上一阶段采入的对应输入端子状态，从输出映象寄存器读出对应映象寄存器的当前状态。根据用户程序进行逻辑运算，运算结果再存入有关器件寄存器中。

5） 输出处理

程序执行完毕后，将输出映象寄存器，即元件映象寄存器中的Y寄存器的状态，在输出处理阶段转存到输出锁存器，通过隔离电路，驱动功率放大电路，使输出端子向外界输出控制信号，驱动外部负载。

（3）PLC的运行方式：

1） 运行工作模式

当处于运行工作模式时，PLC要进行从内部处理、通信服务、输入处理、程序处理、输出处理，然后按上述过程循环扫描工作。

在运行模式下，PLC通过反复执行反映控制要求的用户程序来实现控制功能，为了使PLC的输出及时地响应随时可能变化的输入信号，用户程序不是只执行一次，而是不断地重复执行，直至PLC停机或切换到STOP工作模式。

注：PLC的这种周而复始的循环工作方式称为扫描工作方式。

2） 停止模式

当处于停止工作模式时，PLC只进行内部处理和通信服务等内容。

HYDAC BETAFIT 1.06.39D03BN HYDRAULIC FILTER ELEMENT, NIB

NORGREN 175oF, 300PSIG, REGULATOR R24-401-RNXA

FESTO 32MM BORE 250MM STROKE PNEUMATIC CYLINDER, DNU-32-250-PPV-?A

YUKEN HYDRAULIC CYLINDER CJT70-FA32B50B-?PD-EK

SMC CYLINDER CDNAFN80N-100-D?-J59WLS

LUBRIQUIP PUMP ASSEMBLY AL-25, 521-000-020, L-90

FESTO 63MM BORE 50MM STROKE PNEUMATIC CYLINDER, DKE-63-50-PPV-A

MAC 24 VDC 6.0W SOLENOID VALVE 280B-506AAAA

SMC 50MM BORE 200MM STROKE PNEUMATIC CYLINDER CNAFN50N-200-D

YUKEN HYDRAULIC CYLINDER CJT70-FA32B600B?-BAD

BI * BI UNION FITTING * UNKNOWN

FESTO 40MM BORE 400MM STROKE PNEUMATIC CYLINDER, DNC-40-400-PPV-?A, NNB

PARKER P11771 -20-20 CRIMP FITTING SAE CODE 61 FLANGE HEAD 45 ELBOW

YUKEN CYLINDER CJT70-FA80B80H-?CBA-N 2012-411A

MAC PR65C-11BA 150 PSI PR65C SERIES PRESSURE REGULATOR, NNB

FESTO 145 PSI, SERIES ED08-14918 PNEUMATIC CYLINDER ADV-40-50-A

BOSCH RACINE 221887

SMC VXZ2240L SINGLE UNIT ZERO DIFFERENTIAL PILOT OPERATED DIAPHRAGM VALVE

ASHCROFT DURAGAUGE BRONZE TUBE 30-0VACUUM-IN/H?G. GAUGE 45-1379 103764

PARKER 11971-32-32 SAE CODE 61 FLANGE HEAD 90 ELBOW

MAC 6311A-512-PM-11?1DA 110/120 VOLTS 50/60 SOLENOID VALVE

MLOK CYLINDER RCN-138600CA

NUMATICS 24VDC, 4.0W, 150PSIG-AIR, PNEUMATIC VALVE I34BA400MP00061

SMC PNEUMATIC SERVICE KIT NIB CK95-80 105415

PARKER 150PSI 1034kPa PNEUMATIC SOLENOID VALVE B511ABB53C

NUMATICS 150PSIG PNEUMATIC SOLENOID VALVE NNB I35SA43BK000030 100509

NUMATICS PNEUMATIC PRESSURE REGULATING VALVE 031RD700O000000 NIB

MLOK CYLINDER RCN-138600-800-?05

NUMATICS 110/120V .06A 60HZ 150 PSIG SOLENOID VALVE, 031SA415O011Z

NUMATICS 120 V, 50-60HZ, .08A SOLENOID VALVE 1525A425K

NUMATICS PNEUMATIC AIR FILTER REGULATOR F22B-01AM 99883

NUMATICS MAX OPERATING PRESSURE 150 PSIG SOLENOID VALVE 135BB515MP00061

FESTO CPV18-VI U502 DISTRIBUTION MANIFOLD ASSEMBLY 185 886 T402

GRACO 250PSI 17.5BAR AIR LINE REGULATOR A01 A 214848

FESTO 63MM BORE 920MM STROKE PNEUMATIC CYLINDER, DKE-63-920-PPV-?A

ADVANCE AUTOMATION AAC SK-1176 PNEUMATIC CYLINDER SERIES I, NNB

TAIYO PNEUMATIC CYLINDER 40X30 NPB031A000-0

FESTO ALUMINUM CYLINDER 10543 DKE-100-60-PPV-?P

ELECTRON BEAM ENGINEERING QCC HD 504 WELDING CABLE, LOT OF TWO, NIB

FESTO 145 PSI 100MM BORE 160MM STROKE PNEUMATIC CYLINDER, DNC-100-160-PPV?, NNB

FESTO 32mm BORE 150mm STROKE PNEUMATIC CYLINDER DNC-32-150-PPV-?A NNB

FESTO 63MM BORE 125MM STROKE PNEUMATIC CYLINDER, DNU-63-125PPV-A?, NNB

NUMATICS 120V, 0.11A, 150 PSIG SOLENOID VALVE I52SA400K046T

MAC VAC/25-150PSI, 24VDC, 2.5W, PNEUMATIC SOLENOID VALVE 6523B-000-PM-59?2DA

BIMBA BRACKET CYLINDER D-167

PARKER 035341300B FILTER, NIB

SMC 1.0MPA PNEUMATIC CYLINDER DLMBN20-25C-G59?LS

PARKER 5000PSI DIRECTIONAL CONTROL VALVE 44036-2026

PARKER 250PSI ROTARY PNEUMATIC ACTUATOR PTR252-0983F-AX?22-C21

SMC 0.05-0.85MPA AIR REGULATOR AR4000-04BG

KYOHO MACHINE HCI-XD CYLINDER 40MM BORE 435MM STROKE 40X435-FA 74H40956

STAFFA FIXED DISPLACEMENT HYDRAULIC MOTOR HM/HDB2005/11

FESTO CPV14-VI TD02 DISTRIBUTION MANIFOLD ASSEM W/ SILENCER AND ELBOW FITTINGS

MAC 110/120VOLTS 150PSI SOLENOID VALVE 6311D-211-PM-11?1DA

FESTO 145 PSI 100MM BORE 30MM STROKE PNEUMATIC CYLINDER, ADVU-100-30-A-P?-A, NNB

YUKEN HYDRAULIC CYLINDER CJT 70 FA32B 20N-DND EK 11A

BELLOWS 110/120V 50/60HZ PNEUMATIC SOLENOID PILOT VALVE, K175-9035

FESTO 145 PSI 50MM BORE 90MM STROKE PNEUMATIC CYLINDER, DNG-50-90-PPV-A?, NNB

FESTO CPV14-VI T402 DISTRIBUTION MANIFOLD ASSEM W/ SILENCER AND ELBOW FITTINGS

FESTO 145 PSI 50MM BORE 153MM STROKE PNEUMATIC CYLINDER, DNGU-50-153-PPV?-A, NNB

YUKEN HYDRAULIC CYLINDER CJT70-FA32B25N-?AND-EK 20A

MAC 110/120V 50/60HZ 150 PSI SOLENOID VALVE, 58D-43-116AA

CKD PNEUMATIC CYLINDER SSD-KL-50-80

PARKER HHB4087501 ALR 35-150 PSIG CONTROL VALVE, NNB

NUMATICS PNEUMATIC FILTER MODEL F30B-04C NIB

FESTO FLAT CYLINDER DZH-50-300-PPV-?A

BIMBA AIR CYLINDER BFT-093-D

PARKER 11771-32-32 CRIMP FITTING SAE CODE 61 FLANGE HEAD -45 ELBOW

KYOHO MACHINE HCI-XD CYLINDER 50MM BORE 115MM STROKE 50X115-CB 66H50888

PARKER 2.00 " BORE 8.000" STROKE HYDRAULIC CYLINDER JMAU14A

LENZ * LENZ NUT FITTING * UNKNOWN

NUMATICS 150PSIG, 110-120V, 50/60Hz, .15A, SOLENOID VALVE 081SS400K000030

FAIRCHILD TD C17800-406 PNEUMATIC TRANSDUCER, NNB

NUMATICS L23PM452O000000 PILOT VALVE, NNB

MAC PR92C-KECA 120 PSI PRESSURE REGULATOR, NIB

SMC PNEUMATIC CYLINDER 25MM BORE 35MM STROKE CQSB25-35D

NUMATICS 24VDC 4.0W 150 PSIG-AIR PNEUMATIC SOLENOID VALVE, I24BA415MP

NUMATICS 0-232 PSIG PNEUMATIC SOLENOID VALVE W/ BASE, I34JJ641O000000

NUMATICS 110/120V 50/60HZ 150 PSIG-AIR SOLENOID VALVE W/ BASE, I35BA415KKP0003?0

MAC PR92C-KECA 120 PSI PRESSURE REGULATOR WITH GAUGES, NIB

VERSA 120V 100PSI SOLENOID VALVE ESM 8012 44 Z CLL36

KYOHO HCI-XC HYDRAULIC CYLINDER 40X100-FB / 56H40995

NUMATICS 100-115V/50Hz, 110-120V/60Hz, .06A SOLENOID COIL 237-1045B

MAC 24 VDC 2.5W 150 PSI SOLENOID VALVE W/ BASE, 6313D-611-PM-59?1DA

BELLOWS INTERNATIONAL SOLENOID VALVE W / PILOT VALVE L615-49-102 / K065-9035

ASHCROFT DURAGAUGE 30-IN./HG.VAC-3?0PSI PRESSURE GAUGE 102553

MILWAUKEE CYLINDER 4.00 BORE 6.00 STROKE 1000 PSI HYDRAULIC CYLINDER LH61

CMT DOUBLE ACTING IMPACT MARKER W/ PROXIMITY SENSOR 288-0B-25-PML-W?2817

SMC 1.0MPS PNEUMATIC PRESSURE REGULATOR FILTER AF4000-04D

HYTORK 4581 ACTUATOR EIA-XL4581-A80-?B00

KYOHO HCI-XD CYLINDER 40X460-FA

NUMATICS ELEMENT FILTER EKF608G NIB

AMETEK PNEUMATIC HAND PUMP T-970

NUMATICS 24VDC 4.0W 150 PSIG-AIR SOLENOID VALVE, I23BB500MP00061

NUMATICS 24VDC 4.0W 150 PSIG-AIR PNEUMATIC SOLENOID VALVE, I34BB500MP00061

NUMATICS 110/120V .15A 50/60HZ 150 PSIG-AIR SOLENOID VALVE, 11DSA400C011J

NUMATICS 24VDC 4.0W 150 PSIG-AIR PNEUMATIC SOLENOID VALVE, I34BB400MP14D61

NUMATICS 24VDC 4.0W 150 PSIG-AIR SOLENOID VALVE W/ ONE COIL, I24BB415MP00061

FESTO 32mm BORE 100mm STROKE GUIDED CYLINDER DFM-32-100-P-A-?GF

SMC 20MM BORE 75MM STROKE 0.15-0.7MPA EXTENSION END AIR SLIDE TABLE, MXQ20L-75BS

NUMATICS 120V .12A 50/60HZ 150 PSIG-AIR SOLENOID VALVE W/ BASE, 081SS400K

FESTO 145PSI PNEUMATIC CYLINDER DNC-40-60-PVV-A

SMC PNEUMATIC CYLINDER 25MM BORE 150MM STROKE CDQSB25-150DC

YUKEN HYDRAULIC CYLINDER CJT70-LB40B85B-?BAD

YUKEN HYDRAULIC CYLINDER CJT70-FA40B160B?-CAA

KYOHO HCI-XD HYDRAULIC CYLINDER 40X27-FA / FXH40415

SMC CYLINDER CDNAGN40N-100-D W/CNA40ND-UA