西门子中国总代理PLC 代理PLC的硬件组成1.2.1　PLC的控制系统构成是常用自控系统模块连接图。在PLC控制系统中，CPU模块是必不可少的，它是整个系统的大脑。【通信模块】根据使用需求选配，PLC需要与外部通信时就选择通信模块。【输入模块】和【输出模块】一般都是**有，输入是为了采集外部信号，而输出是为了控制外部设备。有人说：“我用CPU只做通信，不做输入也不做输出。”在特殊情况下那样使用也是可以的。常规使用都有数字量输入、数字量输出和通信，基于这种情况，小型的CPU模块集合了数字量输入和数字量输出，同时也集成了对外通信端口。如果当前配置满足串口通信模块通常分为以下3类：RS-232通信模块、RS-485通信模块、RS-422通信模块。一般情况下，一个通信模块只支持一种通信方式。为了满足市场需求和兼容性，有的通信模块可能具备两种或者多种通信方式，例如有的模块同时支持RS-485通信和RS-232通信。同一种通信方式也可能支Function西门子中国总代理PLC 代理Construction of electrical Industrial Ethernet line or star topologiesAutomatic data transmission rate detection (10/100/1000 Mbps), with autosensing and autocrossover functionEasy network configuration and network expansion;no limitation on network expansion with cascading of the switchesNetwork topology and network configuration西门子中国总代理PLC 代理The SCALANCE XB-000 switches are typically installed with the stations to be connected in a control cabinet or control box.When configuring the network, it is necessary to observe the following boundary conditions:Length of the TP cable between two SCALANCE XB-000 switches:max. 100 m西门子中国总代理PLC 代理max. 10 m via patch cables with TP Cordmax. 100 m via Industrial Ethernet FC Outlet RJ45, IE FC Standard Cable and TP CordLength of the fiber-optic cables:max. 5 km with Industrial Ethernet FO cablesMultimodemax. 26 km with Industrial Ethernet FO cablesSingle mode西门子中国总代理PLC 代理Electrical star topology with SCALANCE XB005 or SCALANCE XB005GElectrical line topology with SCALANCE XB005 and XB008, or SCALANCE XB005G and XB008GMixed star topology with SCALANCE XB004-1 or SCALANCE XB004-1GElectrical star topology with SCALANCE XB005G and connection to a Gigabit Ethernet ringDiagnosticsThe following information is displayed by LEDs on site:PowerPort statusData trafficTechnical specifications西门子中国总代理PLC 代理Article number6GK5004-1BD00-1AB26GK5004-1BF00-1AB26GK5004-2BF00-1AB26GK5005-0BA00-1AB26GK5008-0BA10-1AB2product type designationSCALANCE XB004-1SCALANCE XB004-1LDSCALANCESCALANCE XB005SCALANCE XB008transfer ratetransfer rate10 Mbit/s, 100 Mbit/sinterfaces for communication integratednumber of electrical connections● for network components or terminal equipment4; RJ454; RJ455; RJ458; RJ45number of 100 Mbit/s SC ports● for multimode10● for single mode (LD)12interfaces other● for power supply1type of electrical connection3-pole terminal block3-pole terminal blocksupply voltage, current consumption, power losstype of voltage 1 of the supply voltageDC● supply voltage 1 rated value24 V24 V● power loss [W] 1 rated value2.64 W2.4 W1.68 W2.88 W19.2 ... 28.8 V19.2 ... 28.8 V● consumed current 1 maximum0.11 A0.1 A0.07 A0.12 A● type of electrical connection 1 for power supply● product component 1 fusing at power supply inputYesYes● fuse protection type 1 at input for supply voltage0.6 A / 60 V0.6 A / 60 Vtype of voltage 2 of the supply voltage● supply voltage 2 rated valueambient conditionsambient temperature● during operation-10 ... +60 °C-10 ... +60 °C● during storage-40 ... +80 °C-40 ... +80 °C● during transportrelative humidity● at 25 °C without condensation during operation maximum95 %95 %protection class IPIP20design, dimensions and weightsdesignBoxwidth45 mmheight100 mmdepth87 mmnet weight0.165 kg0.205 kg0.18 kgfastening method● 35 mm top hat DIN rail mounting● wall mounting● S7-1500 rail mountingNoNoproduct functions management, configuration, engineeringproduct function● multiport mirroring● CoSPROFINET conformity classAproduct function switch-managedproduct functions redundancy● Parallel Redundancy Protocol (PRP)/operation in the PRP-network● Parallel Redundancy Protocol (PRP)/Redundant Network Access (RNA)standards, specifications, approvalsstandard● for FMFM3611: Class 1, Divison 2, Group A, B, C, D / T4, CL.1, Zone 2, GP. IIC, T4FM3611: Class 1, Divison 2, Group A, B, C, D / T4, CL.1, Zone 2, GP. IIC, T4FM3611: Class 1, Divison 2, Group A, B, C, D / T4, CL.1, Zone 2, GP. IIC, T4● for safety from CSA and ULUL 60950-1, CSA C22.2 No. 60950-1UL 60950-1, CSA C22.2 No. 60950-1UL 60950-1, CSA C22.2 No. 60950-1● for emitted interferenceEN 61000-6-4 (Class A)EN 61000-6-4 (Class A)EN 61000-6-4 (Class A)● for interference immunityEN 61000-6-2EN 61000-6-2EN 61000-6-2MTBF232 y238 y241 y214 yreference code● according to IEC 81346-2KFKF● according to IEC 81346-2:2019KFEKFEstandards, specifications, approvals CEcertificate of suitability CE markingstandards, specifications, approvals hazardous environmentsstandard for hazardous zoneEN 60079-0:2009, EN60079-15:2010, II 3 G Ex nA IIC T4 Gc, KEMA 07ATEX0145 XEN 60079-0:2009, EN60079-15:2010, II 3 G Ex nA IIC T4 Gc, KEMA 07ATEX0145 Xcertificate of suitability● CCC for hazardous zone according to GB standardYesstandards, specifications, approvals othercertificate of suitabilityEN 61000-6-2, EN 61000-6-4EN 61000-6-2, EN 61000-6-4● C-Tick● KC approvalArticle number6GK5004-2BD00-1AB26GK5005-0GA10-1AB26GK5008-0GA10-1AB26GK5004-1GL10-1AB26GK5004-1GM10-1AB2SCALANCE XB004-2SCALANCE XB005GSCALANCE XB008GSCALANCE XB004-1GSCALANCE XB004-1LDG10 Mbit/s, 100 Mbit/s, 1 000 Mbit/s2number of 1000 Mbit/s SC ports1● for single mode (LD)1interfaces other4 W10.5 W12.5 W0.165 A0.44 A0.52 A0.5 A / 60 V0.172 kg0.188 kg0.21 kg0.168 kgproduct features, product functions, product components generalnumber of automatically learnable MAC addresses1 024product functions management, configuration, engineering持多种协议*1种是根据通信接口的不同来分类，如CPU模块带RS-485通信接口、RS-232通信接口或者网口等。同的设备工作方式也不一样。计算机的工作方式为等待命令的工作方式，而PLC的工作方式为循环扫描的工作方式。其工作原理如下：当S闭合时，光电耦合器导通，LED点亮，表示输入开关S处于接通状态。此时A点为其工作原理如下：当S闭合时，光电耦合器导通，LED点亮，表示输入开关S处于接通状态。此时A点为高电平，继电器输出型PLC的负载电源可以是交流电，也可以是直流电，为有触点开关，带负载能力比较强，一般在2A左右，但寿命比无触点开关要短，开关动作频率也相应低一些，一般小于等于1Hz。也可以用晶体管输出模块控制直流中间继电器或者接触器，进而控制220V或者380V的交流负载。西门子中国总代理PLC 代理4．电源PLC的电源是指将外部输入的交直流电源转换成供CPU、存储器、输入和输出接口等内部电路工作需要的直流电源。许多PLC的直流电源采用外部开关电源，不仅可以给模块供电，还可以为输入和输出设备提供负载电源。西门子中国总代理PLC 代理一般继电器输出的CPU模块，输入电源是AC220V。而晶体管输出的CPU模块，输入电源是DC24V。有些CPU模块还集成了负载电源。【扩展理解】　很多小型CPU模块集成直流24V负载电源，此电源的带负载能力很小，一般只有几百毫安。当所需负载电流*出该集成电源时需要外接电源。电源一般不能并联使用，如果CPU集成的24V电源不够，则负载电源可全部采用外部24V电源。1.4　PLC编程的学习路线西门子中国总代理PLC 代理本书不仅讲述方法和经验，还包含学习思路的指引。跟着教程和案例，学习，练习，再实践。还要善于做笔记和自我总结，方便以后回顾。不懂的地方可研究与之相关的知识，及时疑问并想办法解决。随着时间的推移，大家就会积累自己的经验并慢慢感悟，逐渐就能独立编程。就像开车一样，拿到驾照之后也西门子中国总代理PLC 代理