15D8G4
日期：2020-7-9
当PLC运转时，是经过执行反映节制要求的用户顺序来完成节制义务的，需求执行很多的操作，但CPU不成能还去执行多个操作，它只能按分时操作（串行任务）方法，每一次执行一个操作，按挨次逐一执行。因为CPU的运算处置速度很快，所以从微观上来看，PLC外部呈现的后果似乎是还（并行）完成的。这种串行任务进程称为PLC的扫描任务方法。
用扫描任务方法执行用户顺序时，扫描是从第一条顺序开端，在无中缀或跳转节制的状况下，按顺序存储挨次的先后，逐条执行用户顺序，直到顺序完毕。然后再从头开端扫描执行，循环往复反复运转。
PLC的扫描任务方法与电器节制的任务道理分明分歧。电器节制安装采用硬逻辑的并行任务方法，假如某个继电器的线圈通电或断电，那么该继电器的一切常开和常闭触点不管处在节制线路的哪个地位上，都邑立刻还举措；而PLC采用扫描任务方法（串行任务方法），假如某个软继电器的线圈被接通或断开，其一切的触点不会立刻举措，必需等扫描到该时才会举措。但因为PLC的扫描速度快，凡间PLC与电器节制安装在I/O的处置后果上并没有什么差异。 问：搜索所有波特率后，总是提示：通讯超时，请核查端口号，网络地址，波特率设置和连接电缆。端口号是COM3。网络地址：本地0，远程2；波特率9.6k。
答：开始确定你的电缆设定通讯端口 设置PG/PC口 选择PC/PPI
1.把你的CPU打到STOP位置
2.确定你的CPU内有没有程序，如果有程序那么确定你的电缆
电缆是原装的还是国产组装的
如果是原装的一般的时候可以搜索到地址
如果是国产的不支持大于9.6K通讯速率
3.你选择的端口是COM3如果是USB转换的多数是国产的
所以建议你使用原装的电缆编程 可最高支持187.5K
4.如果你不需要CPU里面的程序可以把CPU恢复出厂设置
这个时候就是默认的9.6k
方法：
西门子提供一个wipeout.exe应用程序，可以恢复PLC为原厂设置，并且删除用户程序，数据块，和所有的配置信息，PLC将被设置为地址2，波特率9600。WIPEOUT在DOS环境下运行，不过您一定按照提示完成。如果一次不成功请重复测试，它的基本原理是这样的，PLC在上电这初期（非常短）是以出厂设置的状态工作的，WIPEOUT只有这段时间才有控制权改变PLc的设置的。所以您加电和键盘操作一定要配合好。
问：西门子PLCS7-200与组态软件采用DP通讯，PLC和其他设备还可以通过MODBUS通讯吗，还需要加通讯模块吗，已经加了EM277模块走DP通讯！
答：西门子S7-200与上位机直DP通讯，则余出编程口，可以用作MODBUS通讯。
这样如果选用的是一个编程口的PLC模块，则存在一个问题，即编程口被占用，调试程序时不方便。所以建议选用两个编程口的224XP或226的CPU。
问：在顺序继电器s0.4中有SM0.1 特殊寄存器，是通电先执行SM0.1特殊寄存器呢，还是到S0.4这步中在执行SM0.1 我感觉应该通电就执行SM0.1吧
答：SM0.1只有在程序从STOP进入RUN状态后第一个扫描周期内为“1”；从第二个扫描周期开始一直为“0”。它与S0.4没有任何关系。如果S0.4在第一个扫描周期内已经执行，这个SM0.1还能在这个扫描周期内有效；否则在这里用SM0.1就是扯淡。SM0.1是不会由S0.4置位的，谁也控制不了这个位。
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Cisco Catalyst WS-C3550-12T 10-Ethernet & 2-GBIC Ports Managed Stackable Switch
Cisco Catalyst WS-C3560X-24P-L-incl C3KX-NM-1G;C3KX-PWR-715WAC;2-C3KX-FAN-23CFM
Cisco AIR-ANT2452V-R AIR ANT2452V R Omni Antenne 2500MHz 2.5GHz beige OVP NEU
Cisco C1861-SRST-B/K9 Integrated Services Router SRST or CME 8x PoE 4FXS 2BRI
CISCO SRW2008-K9-NA Switch 8 Port 10 100 1000Mbps
Cisco SFP-10G-LR 10GBASE-LR SFP transceiver module for SMF
CISCO CATALYST 3750-E SERIES POE-48 WS-C3750E-48PD-SF C3K-PWR-1150WAC SWITCH
Cisco 7941G Unified VoIP IP Phone Cleaned Tested CP-7941G ~ SIP ~SCCP
Cisco A900-IMA8T 8-Port RJ45 Gigabit Module ASR 903
Cisco A900-IMA8S ASR 903 8 Port SFP GIGABIT Ethernet
Cisco SFP-10G-SR= Erweiterungsmodul (10GBase-SR, SFP)
Cisco Catalyst 4900M WS-X4920-GB-RJ45 20-port 10/100/1000 RJ-45 half card
Cisco 7961 Series CP-7961G Unified IP Phone VoIP Desk IP Phone
Cisco Catalyst C6509-E-FAN Chassis Fan Tray Module Working Pull
Cisco Catalyst 2960 WS-C2960-48PST-L 48 Port PoE Rack Mount Managed Switch
Cisco ME-3400-24FS-A V01 Metro Switch Tested/working!
CISCO WS-C3850-48P-E Catalyst 48-Port Switch (Brand New) *30 day Warranty*
Cisco OSM-1CHOC12/T3-SI Singlemode Intermediate Reach (LC) OC12 to T3 W/ 4GbE
Cisco OSM-2+4GE-WAN+ Enhanced OSM 4 GE WAN ports and 2 GE LAN ports 6500/7600
Cisco OSM-12CT3/T1 12-port Channelized DS-3 to DS-1/DS-0 Services Module 7600
Cisco 7609 Router With Dual 6000Watt AC, Dual HS Fans, Dual WS-SUP720-3BXL 1GB
Cisco PWR-WAVE-450W AC Power Supply for WAVE-594/WAVE-694
Cisco 7609 Router With Dual 6000Watt AC, Dual HS Fans, Dual WS-SUP720-3B
Cisco PWR-ME3750-AC Power Supply For ME-C3750-24TE-M Redundant 240V AC PSU
Cisco HWIC-1FE 1 Port Fast Ethernet High-Speed WAN Interface Card Layer 3 ISR
Cisco C3KX-NM-10G 2 Port 10GbE Uplink Module 3560X/3750X Switches SFP+/SFP
Cisco WS-C2960S-24PS-L 24 10/100/1000 PoE+ Switch - See pictures some scratches
Genuine Cisco SFP-OC48-IR1 - OC48 IR1 SFP 10-1963-01
New in Box Cisco Systems AIR-ANT1949 Antenna - Free Shipping!!
CISCO3845 Integrated Services Router with Single AC Power QTY Available
Cisco Catalyst WS-C2960-48PST-L 48-Ports 10/100 PoE Switch
CISCO 2921-V/K9 Cisco2921-V/K9 Voice Bundle Router w/PVDM3-32 & PVDM3-16 Modules
Cisco PWR-2811-AC-IP 341-0102-01 AA22230-A 105W Pwr Supply for Cisco 2811 Series
NEW Cisco N2K-C2232PP-10GE with 8 SFP-10G-SR / 8 GLC-SX-MMD/16 FET-10G's Modules
Cisco 1941- K9 router New/Boxed
Cisco sge2000p 24 port 10-100-1000 gb switch ad alte prestazioni
Cisco ASA5520 VPN Adaptive Security Appliance - Cisco ASA 5520 VPN Firewall Ears
ASA5550-BUN-K9 - Cisco ASA 5550 VPN Firewall w/ Premium License Ears SSM-4GE-INC
Cisco WS-C4948E-E Catalyst 4948E 48-Gigabit Ports & 4-SFP+ 1/10GbE AC ES
Cisco 5520 Series Adaptive Security Appliance ASA5520 ASDM Factory Default
Cisco Catalyst WS-C4900M + 2x PWR-C49M-1000AC power + Brackets switch 4900M
Cisco 800 Series Wireless Router (C881W-A-K9) | 881C | Enterprise Router
Linksys Cisco Small Business Managed SRW2008P 8-Ports Ethernet Switch B-1
Cisco 892F-CUBE-K9 V03 refurbished with 90 days warranty!
CISCO UCS RAID SAS 2008M-8I DUAL PORT PCI-E X8 MEZZANINE CARD 74-10149-01
Cisco Catalyst (WS-C2960G-24TC-L-V02) 24-Port Managed Switch
Cisco AIR-PWR-4400-AC Cisco Power Supply
Cisco Catalyst WS-C3560-48PS-S Switch 90 Day Warranty QTY Available
Cisco 1921 2-Port Gigabit Wireless Router (CISCO1921-SEC/K9)
Cisco Catalyst 2960G Series 48-Port Switch with Rack Mount WS-C2960G-48TC-L V01
Lot of 2 Genuine Cisco 30W AC Power Adapter 5V 12V 3A 2A 34-0874-01 ADP-30RB
Custom Linksys Cisco Security Wifi Router or Gateway / 4-Port Switch
Custom Linksys Cisco Security Wifi Router or Gateway / 4-Port Switch Black USA
ORIGINAL CISCO X2-10GB-LR VO4 (MORE THAN 10 AVAILABLE)
Cisco CISCO2901/K9 2900 Series Router, Warranty | 1510975
Cisco ASA5510 Security Appliance, Warranty | 1473471
Cisco ASR1001 ASR Series Router, Warranty | 1527350
Cisco WS-C2950-24 Ethernet Switch, Warranty | 1511062
Cisco 1720 & 1750 10/100 Modular Routers w/ 1 Power Supply
Cisco 3750G 48-Port 1Gbps Gigabit Network Switch WS-C3750G-48TS-S Rack Mount
LOT of (10) Cisco WS-F6700-DFC3C * Make Best Offer* Tested/Working/30DayWarranty
Cisco 2821 Router P/N: CISCO2821 V03
Cisco WS-C3560C-12PC-S Desktop Ethernet Switch
Cisco HWIC-1FE Fast Ethernet Layer 3 High-Speed WAN Interface Card
CISCO CP-7912G-A Part number 74-3098-05 Rev.EO
Cisco 1841 Wired Router (CISCO1841-HSEC/K9-RF)
Cisco ASR1001-X-PWR-DC ASR1001-X Direct Current Power Supply DC 341-0607 KK
Cisco PWR675-AC-RPS-N1 Redundant Power System with power cord. NO other cables
Cisco HWIC-4ESW-POE 4 Port POE High Speed WIC
Cisco Catalyst 3750 Series 16-Port Switch WS-C3750G-16TD-S w/ Rack Ears
Cisco 3850 Series WS-C3850-48T-L 48 Gigabit Ports Switch w/ 2x 350W AC PSU
Cisco 6500 Catalyst w/ 2x Power Supplies, WS-X6K-SUP2-2GE, WS-X6416-GBIC, X6348
Cisco WS-C2975GS-48PS-L Catalyst Series PoE-48 Gigabit Switch
Cisco WS-C3560G-48TS-S Catalyst 48x 10/100/1000 Gigabit Ports Switch. Qty Avail.
6pcs Cisco WS-X3500-XL GigaStack GBIC Gigabit Interface Converters $25
Cisco Systems ATM-1A-T3 Network Module
CISCO AS53-VOXD 12 PORT C549 VOICE DSP MODULE for AS5300 SERIES
CISCO 2500 SERIES ETHERNET ROUTER (2501) + Power Cord
CISCO CATALYST WS C2950T -24 SWITCH + Power Cord
Cisco WS-C3750G-24PS-S Catalyst 24 Port Switch Failed AS-IS LOT OF 10
Cisco WS-G5483 100BASE-T GBIC (Qty 5)
LOT of (10) Cisco WS-X6748-GE-TX-3C w/ WS-F6700-DFC3C installed
Cisco 7201 CISCO7201-AC 256MB REASONABLE OFFERS WELCOME !! TESTED !!
Cisco WS-C3750G-24PS-S Catalyst 24 Port Switch Failed AS-IS
Cisco ASR1002-PWR-AC AC Power Supply, Warranty
Cisco WS-C3750G-48PS-S Catalyst 48 Port Switch Failed AS-IS LOT OF 10
Cisco DS-SFP-FC4G-SW 10-2195-01 4GB SFP Fiber Transceivr (Lot of 125) #TQ365
Cisco DS-SFP-FC8G-SW 10-2418-01 Fibre Channel SFP Adapter (Lot of 192) #TQ359
Cisco DS-SFP-FC4G-SW 10-2195-01 4GB SFP Fiber Transceivr (Lot of 514) #TQ360
Cisco Systems ASA 5505 - Adaptive Security Appliance Firewall
Cisco WS-C3750G-48PS-S Catalyst 48 Port Switch Failed AS-IS
Cisco Catalyst 3500 Series XL 24-Port
Cisco Adaptive Security Appliance ASA5510 Firewall with ASDM Factory Reset
Cisco Systems CNMYAD9GAA FAN Switch Module -NEW?
Cisco NM-8AM-V2 8-Port RJ-11 Analog Modem Network Router Module
Cisco WS-G5487 GBIC 1000Base-ZX
Cisco ATA 186 ATA186-I1-A 100 Mbps Voice Interface Analog Telephone Adaptor
Cisco Meraki MX80 Cloud Managed Security Appliance Firewall A80-17100
CISCO N2200-PAC 400W power supply boxed New
Cisco CSS11503-AC V01Content Service Switch w/Cisco CSS5-IOM BFE/Cisco M-2GE
Cisco Systems Model Cisco 870 Router+ Netzteil+Telefonkabel
Cisco AIR-PWRINJ4 Power Injector - POE30U -560(G) AP1140/1250/1260/3500 Series
Cisco Catalyst 3560 Series 48 Port WS-C3560-48
NOB Cisco UBR10-FAN-ASSY Cisco UBR10000 Fan Tray - IPUCALKBAA - model FT76D43/48
Cisco WS-C3850-24P-S
Cisco Catalyst (WS-C2960-48PST-L) 48-Ports Rack-Mountable Switch Managed
lot of 14 Cisco Linksys AD5V/2F Switching Power Supply PSM11R-050 | ADP826
cisco me-4924-10ge
Cisco WS-C2960XR-24TD-I
Cisco VPN 3000 Concentrator Rackmount Includes Power Cord
Lot of 4 Cisco WS-CBS3020-HPQ V02 Blade Switches
Cisco AIR-AP1041N-E-K9 Access Point with 1 Year Warranty Free Shipping Worldwide
CISCO MT18JSF25672PZ-1G4F1DD 2GB 1RX4 PC3-10600R Memory DIMM Module z5
CISCO UCS-C210-M1 UCS C210 M1 Configure to Order Server Chassis z5
Cisco GLC-BX-U 1000 BASE-BX10-U Upstream Bi-directional Single Fiber with DOM zk
CISCO N20-C6508-N UCS 5108 Blade Server Chassis with Rail Kit, New in Box! z5
Cisco WS-X45-SUP7-E Catalyst 4500 E-Series Supervisor Engine 7-E zq
CISCO 74-7114-01 UCS YM-2651B C200M1 C210M1 Server Redundant Power Supply z5
CISCO Broadcom 74-7069-02 Netxtreme II 1GB 4 Port PCI-E Ethernet Adapter Card z5
CISCO 15-11765-01 2GB 1RX4 PC3-10600R Memory DIMM Module z5
Cisco 7960 Six Line Unified VoIP Phone And Cisco 7914 Expansion Module
Cisco WS-C3750X-48P-L 48-Port 10/100/1000 w/ PoE & AC Power - 1 Year Warranty
Cisco Systems 73-0877-06 -Route Processor
CISCO N3K-C3064PQ-10GE & FAN-B & DUAL PWR PDC-350W-B BEST DEAL ON !TESTED!
Cisco Catalyst WS-C3750X-24T 24 Port Gigabit Managed Switch & C3KX-NM-10G Module
9 Pc Lot - Cisco Cisco881-SEC-K9 Security Router (NO POWER SUPPLY NO FACE PLATE)
Broken Cisco Catalyst 3750 48 Port Switch - WS-C3750
CISCO3845 ROUTER, PWR-3845-AC/2 , CISCO3845-MB
Cisco Redundant Power Supply C3K-PWR-1150WAC
CISCO NEXUS 7000 N7K-C7010, 2 *N7K-SUP1, 5 *N7K-M132XP-12L, 3 *N7K-AC-6.0KW
Cisco WS-SVC-WiSM2-1-K9 Wireless Services Module WiSM2
Cisco Catalyst WS-C4948-S 48-Ports Rack Mountable Switch with 2 Power Supplies
CISCO1811W-AG-B/K9 Cisco 1811 Router
Cisco NM-4T 4 Port Serial Network Module 800-02314-03
ONS-XC-10G-C XFP transceiver module - 10 Gigabit Ethernet
Cisco 15454-MRC-12 Expansion Module 800-24423-02
Cisco Catalyst (WS-C3560G-24TS-S) 24-Ports Rack-Mountable Switch
Genuine Cisco SA-VAM2 VPN Acceleration Module 2 for the Cisco 7200 Series
Cisco CRS-8-FC140/S 140GB, CRS-1 FABRIC CARD CRS-3 CRS-8
Cisco UCS 5108 Chassis N20-C6508, 3 *UCSB-B200-M3 (E5-2680 2GHZ *2, 160GB RAM)
Cisco 4400 Series Wireless LAN Controller AIR-WLC4402-25-K9
CISCO 7606-S Router, 1 *WS-SUP720-3BXL, 2 *PWR-7200-AC, 1 *FAN-MOD-6SHS
CISCO WS-C2950SX-24 2950 SERIES 24-PORT MANAGED ETHERNET SWITCH
Cisco ICS 7750 7700 Series Integrated Communication System 310
Cisco X2-10GB-LX4 10GBASE Transceiver Module
Cisco CRS-8-PSH-AC Power shelf, with 3* CRS CRS-PM-AC's
Cisco WS-SUP720-3B Supervisor 720 Integrated Switch Fabric
Cisco CRS-FP40 CRS-1 Series 40-Gbps Distributed Forwarding Processor
CISCO X2-10GB-SR TRANSCEIVER MODULE
Cisco Catalyst 2960 Series Switch WS-C2960-48TC-L V04
Cisco WS-C2350-48TD-S 48-Port RJ45 1000BASE-T
CISCO CRS-8-LCC-FAN-TR
Cisco DMM-C210-K9, INTEL E5-5620 QC, 12GB RAM, 2.4TB, 2AC
CISCO AIR-LAP1142N-E-K9 AIRONET Access Point 802.11N DUAL BAND WIRELESS
Cisco Catalyst WS-CAC-6000W v05 AA23340 6000W AC 6500 Power Supply
Cisco 4-10GE v02 Cisco CRS-1 Series 4X10GE Interface Module
Cisco NM-1T3/E3 Network Module
Cisco NM-ESW-16 16-port 10/100 EtherSwitch Network Module
Cisco 2600 Series 2620 Ethernet Router w/vwic-2mft-t1 x 2
Cisco 2610 Router, w/Wic-1t & NM-2W
Cisco CP-9971-CL-K9 Unified IP 9971
Cisco WS-X4516 Catalyst 4500 Supervisor V Module
Cisco WS-X6516-GBIC 16-Port Gigabit Ethernet Switching Module
Cisco GLC-SX-MM GBIC Transceiver SFP
Cisco NME-WAE-522-K9 Network Module
CISCO 2691 Router, w/VWIC-2MFT-T1
Cisco CWIPCSA-1040 IPC Sensor Communication Service Monitor
Cisco WS-C6K-9SLOT-FAN2 Catalyst 6509 9 Slot Fan Tray
Cisco X2-10GB-CX4 Module
Cisco WS-C3560-48PS-S 48-Ports POE 10/100 Switch quantity free ship warranty
Cisco AIR-BR1400 Series AIR-BR1410A-K-K9 Wireless bridge base station Unit
Cisco CISCO2811 V05 Integrated Services Router W/ 256MB Flash Card #ico
Cisco AIR-PWRINJ3 (LOT of 15)
NEW CISCO ASA5540-BUN-K9 ASA 5540 Appliance
Cisco ASA 5510 Adaptive Security Appliance ASA5510 V06 68-2618-04 COMN510CRA K9
Cisco Systems Serial V.35 28-1620-03
Cisco N7K-C7010-FAB-2
Cisco 2960 Series SI Catalyst WS-2960-48TC-S PoE Switch
GLC-SX-MM(for Cisco), SFP, 1000Base-SX, 550-Meter, 850nm
GLC-SX-MMD(for Cisco), SFP, 1000Base-SX, 550-Meter, 850nm