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PLC网络是由几级子网复合而成，各级子网的通信过程是由通信协议决定的，而通信方式是通信协议*核心的内容。通信方式包括存取控制方式和数据传送方式。所谓存取控制（也称访问控制）方式是指如何获得共享通信介质使用权的问题，而数据传送方式是指一个站取得了通信介质使用权后如何传送数据的问题。
1．周期I/O通信方式
周期I/O通信方式常用于PLC的远程I/O链路中。远程I/O链路按主从方式工作，PLC远程I/O主单元为主站，其它远程I/O单元皆为从站。在主站中设立一个“远程I/O缓冲区”，采用信箱结构，划分为几个分箱与每个从站—一对应，每个分箱再分为两格，一格管发送，一格管接收。主站中通信处理器采用周期扫描方式，按顺序与各从站交换数据，把与其对应的分箱中发送分格的数据送给从站，从从站中读取数据放入与其对应的分箱的接*格中。这样周而复始，使主站中的“远程I/O缓冲区”得到周期性的刷新。
在主站中PLC的CPU单元负责用户程序的扫描，它按照循环扫描方式进行处理，每个周期都有一段时间集中进行I/O处理，这时它对本地I/O单元及远程I/O缓冲区进行读写操作。PLC的CPU单元对用户程序的周期性循环扫描，与PLC通信处理器对各远程I/O单元的周期性扫描是异步进行的。尽管PLC的CPU单元没有直接对远程I/O单元进行操作，但是由于远程I/O缓冲区获得周期性刷新，PLC的CPU单元对远程I/O缓冲区的读写操作，就相当于直接访问了远程I/O单元。这种通信方式简单、方便，但要占用PLC的I/O区，因此只适用于少量数据的通信。
2．全局I/O通信方式
全局I/O通信方式是一种串行共享存储区的通信方式，它主要用于带有链接区的PLC之间的通信。 全局I/O方式的通信原理如图1所示。在PLC网络的每台PLC的I/O区中各划出一块来作为链接区，每个链接区都采用邮箱结构。相同编号的发送区与接收区大小相同，占用相同的地址段，一个为发送区，其它皆为接收区。采用广播方式通信。PLC1把1＃发送区的数据在PLC网络上广播，PLC2、PLC3收听到后把它接收下来存入各自的1＃接收区中。PLC2把2＃发送区数据在PLC网上广播，PLC1、PLC3把它接收下来存入各自的2＃接收区中。PLC3把3＃发送区数据在PLC网上广播，PLC1、PLC2把它接收下来存入各自的3＃接收区中。显然通过上述广播通信过程，PLC1、PLC2、PLC3的各链接区中数据是相同的，这个过程称为等值化过程。通过等值化通信使得PLC网络中的每台PLC的链接区中的数据保持一致。它既包含着自己送出去的数据，也包含着其它PLC送来的数据。由于每台PLC的链接区大小一样，占用的地址段相同，每台PLC只要访问自己的链接区，就等于访问了其它PLC的链接区，也就相当于与其它PLC交换了数据。这样链接区就变成了名符其实的共享存储区，共享区成为各PLC交换数据的中介。
图1 全局I/O方式的通信原理
链接区可以采用异步方式刷新（等值化），也可以采用同步方式刷新。异步方式刷新与PLC中用户程序无关，由各PLC的通信处理器按顺序进行广播通信，周而复始，使其所有链接区保持等值化；同步方式刷新是由用户程序中对链接区的发送指令启动一次刷新，这种方式只有当链接区的发送区数据变化时才刷新。
全局I/O通信方式中，PLC直接用读写指令对链接区进行读写操作，简单、方便、快速，但应注意在一台PLC中对某地址的写操作在其它PLC中对同一地址只能进行读操作。与周期I/O方式一样，全局I/O方式也要占用PLC的I/O区，因而只适用于少量数据的通信。
3．主从总线通信方式
主从总线通信方式又称为1：N通信方式，是指在总线结构的PLC子网上有N个站，其中只有1个主站，其它皆是从站。
1：N通信方式采用集中式存取控制技术分配总线使用权，通常采用轮询表法。所谓轮询表是一张从机号排列顺序表，该表配置在主站中，主站按照轮询表的排列顺序对从站进行询问，看它是否要使用总线，从而达到分配总线使用权的目的。
对于实时性要求比较高的站，可以在轮殉表中让其从机号多出现几次，赋予该站较高的通信优先权。在有些1：N通信中把轮询表法与中断法结合使用，紧急任务可以打断正常的周期轮询，获得优先权。
1：N通信方式中当从站获得总线使用权后有两种数据传送方式。一种是只允许主从通信，不允许从从通信，从站与从站要交换数据，必须经主站中转；另一种是既允许主从通信也允许从从通信，从站获得总线使用权后先安排主从通信，再安排自己与其它从站之间的通信。
4．令牌总线通信方式
令牌总线通信方式又称为N：N通信方式是指在总线结构的PLC子网上有N个站，它们地位平等没有主站与从站之分，也可以说N个站都是主站。
N：N通信方式采用令牌总线存取控制技术。在物理总线上组成一个逻辑环，让一个令牌在逻辑环中按一定方向依次流动，获得令牌的站就取得了总线使用权。令牌总线存取控制方式限定每个站的令牌持有时间，保证在令牌循环一周时每个站都有机会获得总线使用权，并提供优先级服务，因此令牌总线存取控制方式具有较好的实时性。
取得令牌的站有两种数据传送方式，即无应答数据传送方式和有应答数据传送方式。采用无应答数据传送方式时，取得令牌的站可以立即向目的站发送数据，发送结束，通信过程也就完成了；而采用有应答数据传送方式时，取得令牌的站向目的站发送完数据后并不算通信完成，必须等目的站获得令牌并把应答帧发给发送站后，整个通信过程才结束。后者比前者的响应时间明显增长，实时性下降。
5．浮动主站通信方式
浮动主站通信方式又称N：M通信方式，适用于总线结构的PLC网络，是指在总线上有M个站，其中N（N＜M＝个为主站，其余为从站。
N：M通信方式采用令牌总线与主从总线相结合的存取控制技术。首先把N个主站组成逻辑环，通过令牌在逻辑环中依次流动，在N个主站之间分配总线使用权，这就是浮动主站的含义。获得总线使用权的主站再按照主从方式来确定在自己的令牌持有时间内与哪些站通信。
一般在主站中配置有一张轮询表，可按轮询表上排列的其它主站号及从站号进行轮询。获得令牌的主站对于用户随机提出的通信任务可按优先级安排在轮询之前或之后进行。
获得总线使用权的主站可以采用多种数据传送方式与目的站通信，其中以无应答无连接方式速度*快。
6.CSMA/CD通信方式
CSMA/CD通信方式是一种随机通信方式，适用于总线结构的PLC网络，总线上各站地位平等，没有主从之分，采用CSMA/CD存取控制方式，即“先听后讲，边讲边听”。
CSMA/CD存取控制方式不能保证在一定时间周期内，PLC网络上每个站都可获得总线使用权，因此这是一种不能保证实时性的存取控制方式。但是它采用随机方式，方法简单，而且见缝插针，只要总线空闲就抢着上网，通信资源利用率高，因而在PLC网络中CSMA/CD通信法适用于上层生产管理子网。 CSMA/CD通信方式的数据传送方式可以选用有连接、无连接、有应答、无应答及广播通信中的每一种，可按对通信速度及可靠性的要求进行选择。
以上是PLC网络中常用的通信方式，此外还有少量的PLC网络采用其它通信方式，如令牌环的通信方式等。另外，在新近推出的PLC网络中，常常把多种通信方式集成配置在某一级子网上，这也是今后技术发展的趋势。
主营产品：Schneider ,Foxboro,Ovatin,Allen-Bradley,Siemens等各类工控产品，
欢迎来电咨询！
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Okuma OSP 3000 Operator Controller
OKUMA LH 35N OSP5000L MONITOR GRAPHIC CONTROL PANEL 5000 E0105-800-017-1
OKUMA AXIS CONTROLLER 75A SERVO DRIVE BL-D75A *NO CONTROL BOARD*
MITSUBISHI ELECTRIC PM-905C1 CONTROL BOARD SC-45 MC3V OKUMA SEQUENCER CONTROL
MITSUBISHI ELECTRIC PM-905C1 POWER SUPPLY SC-45 MC3V OKUMA SEQUENCER CONTROL
Okuma E4809-045-086-A Control Board w/ added boards
OKUMA CONTROL PANEL
OKUMA OPERATING CONTROL PANEL KEYBOARD OSP500M-G OSP500M G
Okuma OSP Machine Control Panel 7000 CEL-GE E0105-566-132-1 Crown Lathe
MITSUBISHI ELECTRIC PM-304C1 PM304C1 PM-304C BOARD SEQUENCER CONTROL OKUMA HOWA
MITSUBISHI ELECTRIC PM-304C1 PM304C PM-304C BOARD SEQUENCER CONTROL OKUMA HOWA B
Okuma E4809-045-039 Control Board
Okuma E0189-653-025 Pendant Controller Robot Panel NEW
Okuma Robot Panel 5000S EO189-653-025 Pendant Control
OKUMA VR-40 manuals and control software, VR 40, VR40
OKUMA OSP3000 EUA-IC0827 EUAIC0827 CONTROL PANEL /
Okuma XPS-454R Control Circuit Board XPS-356R_ RDK-IC05020 OSP 5000G PNL
E5409-770-002-3 ENGLISH CONTROL PANEL & OKUMA PULSE HANDLE E 3051-977-004
OSP CONTROL OPERATING OPERATOR PANEL 5020M-SC 5020M HA-E0105-653-042 OKUMA MILL
Okuma E4809-770-011 w/ E4809-436-017-D Control Boards
Okuma E4809-045-035-A Control Board
Okuma E4809-032-473 Control Board
Okuma E4809-032-453 Control Board
OKUMA LR15 TURRET CONTROL UNIT E0403-596-001 1919-3900-07-08 60-0215S LR-15
Okuma OSP 3000 Control Pendant w/ Monitoring Lights
Okuma OSP 3000 Control Pendant
OKUMA MC 4VA COMPLETE CONTROL PANEL E5405-019-507 W/ SUMTAK ENCODER MGN-10B-S2
Okuma E0189-653-025 Pendant Controller Robot Panel
OKUMA SPINDLE CONTROL PANEL COOLANT/HYDRAULIC ON/OFF PUSLE GEN A860-0200-T020
Okuma E4809-032-474 Control Board
Okuma E4809-045-038 Control Board
Okuma E4809-045-086-A Control Board w/ added boards
Okuma Control Board E4809-045-146-A
Okuma Pendant Control for Okuma Robot for OSPU100 Control
Pulled from Working Unit
Parker Hydraulic Power Unit 2HP with 4 SOLENOID CONTROL Okuma LNC8
OKUMA OSP3000 Program Control Board #E4809-032-396
PULSE HANDLE E5408-019-043 CONTROLS E5408 019 043 OKUMA PARTS P2 C
PULSE HANDLE CONTROL E5409-183-349 E5409183349 E5409 183 349 OKUMA MILL MC4VAE
OKUMA MC-4VAE CNC VERTICAL MILL AXIS CONTROL PANEL SE000-530-003 OPERATOR
OKUMA CNC CONTROL PROGRAM PANEL OPERATOR SPINDLE MOTOR LOAD E5403-183-442
OKUMA LH-35N CNC MACHINE MOTOR LOAD CONTROL PANEL E5403-183-442
OKUMA LC-10 LATHE MAIN CONTROL PANEL KEYBOARD EUA-1C0827 EUA1C0827
OKUMA OSP3000 E 4809-747-005 C SERVO CONTROL DRIVE C800
OPUS 5000 PANEX CARD5 CONTROL OPERATOR PANEL E0241-653-097-1 OKUMA E5409-770-009
FANUC VELOCITY CONTROL UNIT A06B-6045-H005 HOO6 A20B-0007-0361/03A OKUMA HOWA
FANUC VELOCITY CONTROL UNIT A06B-6045-H005 HOO6 A20B-0007-0361/03A OKUMA HOWA B
OKUMA PULSE HANDLE CONTROL E5409-183-349 E5409183349 E5409 183 349
Okuma CRPIIC control board E4809-045-106-G OPUS 5000II
Nachi Solenoid Operated Directional Control Valves Base Okuma & Howa Lot of
Okuma Control Board SPCI E4809-045-110-C
CONTROL PANEL W/ ENCODER OKUMA LC-10 LATHE
OKUMA SW-OSP PC-1610 M E4809-032-216-M CONTROL BOARD
OSP 5020M OPERATOR PANEL CONTROL ATC 5704B 109 Q 00XX SE000-530-017 OKUMA MILL
Okuma Cadet LNC8 OSP5020L Control Panel with MPG Handwheel 1911-1554
Okuma OPUS 5000 II SVP Control Board E4809-045-109-E
OKUMA MOP Tool control panel, SE000-530-455 NEW
Okuma CNC OSP5020G Plus GP GA GU Series Control Manual
Okuma E4809-032-452-C board from Opus 5000 control
OKUMA LH 35N MACHINE SPINDLE CONTROL OPERATOR PANEL E5406-183-704 E5406183704
LOT OF 3 OKUMA NC CONTROL FLOPPY DISK AND PARAMETER SHEET CNC OKUMA MC4VAE MILL
E5409-770-002-1 Okuma OSP 5000 CONTROL OPERATOR PANEL
OKUMA 6 manuals OSP-E10M and E100M controls. MX-V, MD-V, MA-V series machines
OKUMA OPUS 7000 CONTROL PANEL POWER SUPPLY TDK 9652 CPC-F
OKUMA OSP3000 EUA-IC0827 EUA IC0827 EUAIC0827 CONTROL PANEL
Okuma Control Panel E5409-770-002-3 E54097700023
Fanuc HC74302M _ Keyboard & Controller _ HC743O2M _ HC74202M _ Okuma Howa 4VA
OKUMA LH 35N MACHINE SPINDLE CONTROL PANEL ENCODER OPTCODER MGN-10BN MGN10BN
Okuma OSP3000 Control Rack Chasis, # E4809-45-012A, WARRANTY
Okuma CNC Alarm Error List OSP5020G Plus Control Manual
OKUMA HOWA MILL AC2 MANUAL ON-OFF CONTROL PANEL SWITCH F93074864 CNC TOOL CLAMP
OKUMA CONTROL OPERATING PANEL E5409-770-002-1 ENGLISH
OKUMA LR15 CNC MACHINE CHUCK & SPINDLE CONTROL PANEL E5409-183-217 ES409183217
CHUCK & SPINDLE CONTROL PANEL E5409-183-217 ES409183217 OKUMA LR-15 CNC LATHE
OKUMA OSP MANAGMENT DATA CARD OSP5020L & CONTROL SOFTWARE OKUMA LR-15
KEYBOARD CONTROLLER HC74202M JX331B231D OKUMA PARTS P2
Okuma LB-15 Turning Center Control Panel CRT w/ Swivel
OKUMA E5408-019-041 E5408-019-064 CONTROL PANEL
Nachi Fujioshi Solenoid Operated Directional Control Valve Okuma & Howa Working
OKUMA HOWA Type-Display controller II
OKUMA SERIAL PARALLEL CONTROL PANEL E5420-ZZZ-001 E5420ZZZ001 E5420 ZZZ 001
Okuma E4809-032-452-C Control Board
OKUMA LOWER CONTROL PANEL MC4VA WITH 4TH AXIS
OKUMA OSP3000 PC-1661-B PROGRAM CONTROL BOARD E4809-032-396-B 34809 032 396 B
Okuma OSP3000 Program Control Board E4809-032-396-B, Used, Warranty
Okuma OSP7000M OSP700M OSP 700 7000 CNC Control Manual
Okuma CNC Program OSP5020G Plus Grinder Control Manual
OKUMA LOADING PANEL SWITCH CONTROL E5420-ZZZ-006 E5420ZZZ006 E5420 ZZZ 006
Okuma OSP500L-G NC Control Floppy Disk MFDC-7 Lion OSP500LG
OKUMA MC4VA MISC OKUMA LOWER CONTROL PANEL MC-4VA 8510-19 E5407-019-209
OKUMA OSO 3000 PC-1661-B PROGRAM CONTROL BOARD E4809-032-396-B OKUMA LC-10 LATHE
FUJI ELECTRIC EMERGENCY STOP CONTROL OPERATOR PANEL E5430-ZZZ-001 OKUMA MILL
OKUMA MC4VA 2ND OKUMA OSP 5000M COMPUTERIZED NUMERICAL CONTROLLER MANUAL
EMERGENCY STOP CYCLE START FEED HOLD CONTROL PANEL OKUMA HOWA CNC MILL AC2
OKUMA HOWA CNC MILL AC2 WITH FANUC 6M CONTROL PARAMETERS SETTING MANUAL LIST
OKUMA manuals for U10L & U100L controls,set of 3, NEW
OKUMA LC20 LC-20 FOOT PEDAL SWITCH CONTROL CNC
ô¿ô PRICE REDUCED! TOOL CHANGE CONTROL UNIT FOR OKUMA 5VA SECOM-1-5V
OKUMA LB25 LB 25 CONVEYOR ON OFF CONTROL EMERGENCY CNC
VICKERS BLG-02-B-11 PRESSURE CONTROL VALVE BLG02B11 OKUMA MC 4VA
TOOL CHUCK CONTROL PANEL ES410-183-612 ES410183612 OKUMA LR-15 CNC LATHE
NACHI SOLENOID CONTROL VALVE S-GO1-A2X-GRZ-D2-32 OKUMA LR15 5TH SG01A2XGRZD232
OKUMA HOWA MILL AC2 CNC MACHINE CONTROL HANDLE LEVER SWITCH
OKUMA CONTROL BOX KEYBOARD E5401-183-792 E5401183792 E5401 183 792 E5401 \
NACHI WET DIRECTIONAL CONTROL VALVE S-G01-C6-GRZ-D2-32 OKUMA LR15 OPUS 5000 CNC
NACHI CONTROL VALVE S-G01-C6-GRZ-D2-32 ED80-C6 OKUMA LR15 OPUS 5000 CNC
NACHI DIRECTIONAL CONTROL VALVE S-G01-A3X-GRZ-D2-32 OKUMA LR15 OPUS 5000 CNC
NACHI DIRECTIONAL CONTROL VALVE S-G01-C6-GRZ-D2-32 OKUMA LR15 OPUS 5000 CNC
OKUMA E5406-019-98 LOADING PANEL SWITCH CONTROL
OKUMA LR15 OKUMA NACHI S-G01-B3X-GRZ-D2-32 SOLENOID OPERATED CONTROL VALVE
Okuma MCS Motion Control Systems Maintenance Manual - Used
OKUMA TOUCH SENSOR PANEL CONTROL SWITCH E5408-019-174 E5408019174 E5408 019 174
OKUMA MANUAL TOOL CHANGE CONTROL E5405-019-490 E54050*0 E5405 019 490
OKUMA LOADING PANEL CONTROL SWITCH E5406-019-463 E5406019463 E5406 019 463
OKUMA Maintenance & Operation manuals for E10L & E100L controls,set of 2, NEW
Okuma OSP5020M CNC Control Manual MC-4VAE VMC
OKUMA FOOT PEDAL SWITCH CONTROL CNC
Okuma Drive Unit Motion Control System MCS 2nd Edition Maintenance Manual 4184-E
Okuma Drive Unit MCS Motion Control System Maintenance Manual 1st Edition 4148-E
MANUAL TOOL CHANGE CONTROL PANEL OKUMA MC-4VAE CNC
OKUMA BUL. 836T PRESSURE CONTROL 836T-T253J 836TT253J
Okuma LU-15 CNC Lathe LU 15 Operation & Control Manual
OKUMA MG MANUAL PANEL CONTROL SWITCH E5407-019-210 E5407019210 E5407 019 210
Okuma OSP5020L Special Functions OSP500L-G Control Manual _ 11th Edition
Okuma OSP5020L Special Functions No. 2 OSP500L-G Control Manual 8th Edition
Okuma OSP5020L Special Functions No. 3 OSP500L-G Control Manual _ 9th Edition
OKUMA LR-10 PARTS BOOK MANUAL OSP5020L CONTROL
Okuma Machining Center OSP 5000M-G CNC Control Manual
Okuma CNC Lathe OSP500L-G Control Floppy 3.5" OSP Managment Data Card
OKUMA OPS3000 PC1671B CONTROL BOARD # E4809-032-409-B
OKUMA maintenance manual for LC series lathes with OSP 5000L-G control
OKUMA LH 35N MACHINE CNC OKUMA MACHINE NC CONTROL TAPE NO. 4 LBA03-06-F
OKUMA LH-35N MACHINE CNC OKUMA MACHINE NC CONTROL TAPE NO. 7 LDM03-03-B OSP 5000
OKUMA LH 35N MACHINE CNC OKUMA MACHINE NC CONTROL TAPE NO. 3
OKUMA LH 35N MACHINE CNC OKUMA MACHINE NC CONTROL TAPE NO. 5 LAP03-11-C
FUJI CONTROL OVERLOAD RELAY RCa3737-1C RCa37371C OKUMA HOWA CNC MILL AC2
Okuma Cortez Magnetic cast control reel FREEPOST
Okuma Com Server Type U with UDC-CPU386SX + Okuma AT-CCP UDC-ROMRAM
OKUMA FANUC AC SPINDLE MOTOR A06B-0831-B200 AP40
Okuma VAC Motor VAC-L7.5/5.5R-15 C-R1_VACL7555R15CR1
Okuma Tank / Pump Toshiba 3ph Induction Motor *NO MAIN TAG*_VPVC-F30K-A3-12-401
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