西门子模块总代理上海代理商
模拟量输入/输出模元,通常设置多路转换开关进行通道的切换,而在输出端应设置信号寄存器。为了适应工业生产过程的控制要求,对模拟量输入单元采取了必要的防电磁干扰措施,
(1)开关量输入单元。它的作用是把现场各种开关信号变成可编程序控制器内部处理的标准信号。开关量输入单元按照输入端的电源类型不同,分为直流输入单元和交流输入单
(1)开关量输入单元。它的作用是把现场各种开关信号变成可编程序控制器内部处理的标准信号。开关量输入单元按照输入端的电源类型不同,分为直流输入单元和交流输入单它主要有数据缓冲、单元选择、信号匹配、中断管理等功能。微处理器通过它来实现与各个单元
可编程序控制器的硬件系统由主机系统、输入/输出扩展环节及外部设备组成。1.主机系统
可编程序控制器的主机系统由*处理单元、存储单元、输入/输出单元、输入/输出扩展接口、外部设备接口,以及电源等部分组成。各部分之间通过内部系统总线进行连接。
把可编程序控制器作为下位机与上位机或同级的可编程序控制器进行通信,完成数据的处理和信息的交换,
实现对整个生产过程的信息控制和管理,PLC是实现工厂自动化的理
nstallation of a ring topology with the SCALANCEXF204-2BA.西门子模块总代理上海代理商 The SCALANCE XF204-2BA Industrial Ethernet switch with IP20 degreeof protection is installed in a control cabinet together with thenodes to be connected. Electrical and optical versions can beinstalled together in star, line and ring topologies. When configuring the network, the following boundary conditionsmust be observed:
Optimal design of a ring topology with SCALANCE XF-200BA andSCALANCE XC-200 Commissioning anddiagnostics西门子模块总代理上海代理商 PROFINET diagnostic interrupts from the SCALANCE XF204-2BA can bedisplayed with the appropriate SIMATIC engineering tools and thenprocessed in the PLC with an expanded diagnostic function. Theengineering outlay for the PLC and HMI has been drastically reduceddue to the complete integration in the SIMATIC concept for systemerror messages. The SCALANCE XF204-2BA Industrial Ethernet switch can also beintegrated into a network management system, e.g. SINEC NMS,through the standardized Simple Network Management Protocol (SNMP).In the event of faults in the device, error messages(SNMP traps) can be sent to a network management system (e.g.SINEC NMS) or as an email to a specified network administrator. The integrated web server enables configuration and diagnosticssettings to be made using a standard web browser (e.g. portconfiguration). Statistical information can also be read out overthe web server (e.g. port capacity utilization). The following information is displayed on site by LEDs:
Ethernet communication via 2, 4 or 8-wire copper cables forcommunication up to 1 000 m with VD technology
Technical specifications西门子模块总代理上海代理商Article number6GK5204-2AA00-2GF26GK5204-0BA00-2GF2product typedesignationSCALANCE XF204-2BASCALANCE XF204productoptionsXF-200 base device without mounted BusAdapterXF-200 basedevice with mounted BusAdapterstransfer rate transferrate10 Mbit/s, 100 Mbit/s10 Mbit/s, 100 Mbit/sinterfacesfor communication integrated number of electricalconnections ● for network components or terminalequipment04interfaces other number of electricalconnections ● for signaling contact11● forpower supply11type of electrical connection ● forsignaling contact2-pole terminal block2-pole terminalblock● for power supply2-pole terminal block2-pole terminalblockdesign of the removablestorage ● C-PLUGYesYessignalinputs/outputs operating voltage of the signalingcontacts ● at DC ratedvalue24 V24 Voperational current of the signalingcontacts ● at DC maximum0.1 A0.1 Asupplyvoltage, current consumption, power loss productcomponent connection for redundant voltage supplyYesYestype ofvoltage 1 of the supply voltageDCDC● supply voltage 1 ratedvalue24 V24 V● power loss [W] 1 ratedvalue8.6 W8.6 W● supply voltage 1 ratedvalue19.2 ... 28.8 V19.2 ... 28.8 V● consumedcurrent 1 maximum0.36 A0.36 A● type of electricalconnection 1 for power supply2-pole terminal block2-pole terminalblock● product component 1 fusing at power supplyinputYesYes● fuse protection type 1 at input for supplyvoltage2.5 A (cannot be changed by user)2.5 A (cannot be changed byuser)ambient conditions ambienttemperature ● duringoperation-40 ... +70 °C-40 ... +70 °C● duringstorage-40 ... +85 °C-40 ... +85 °C● duringtransport-40 ... +85 °C-40 ... +85 °Crelativehumidity ● at 25 °C without condensation duringoperation maximum95 %95 %protection classIPIP20IP20design, dimensions andweights 西门子模块总代理上海代理商 More informationYou can order supplementary components for the SIMATIC NET cablingrange from your local contact. Technical support on this subject isavailable from: J. Hertlein SelectionTool: To support the selection of SCALANCE network components, the TIASelection Tool is available at: www.siemens.com/tst Orderingoverview: You can find more information on the FastConnect range inthe "Cablingtechnology for communication networks inindustry" ordering overview. 西门子模块总代理上海代理商 | All about SCALANCE XF-200BA switches Presales InfoCatalogand ordering system onlineTechnicalinfoSupportContact& partnersServiceoffers |
由于采用软连接的方法,在生产工艺流程更改或者生产设备更换时可以不必改变可编程序控制器的硬设备,通过程序的编制与更改就能适应生产的需要。这种编程的灵活性是继电器顺序控制系统所不能比拟的。正是由于编程的柔性特点,使可编程序控制器能大量替代继电器顺序控制系统,成为当今工业控制领域的重要控制设备。在柔制造单元(FMC)、柔制造系统(FMS)、计算机集成制造系统(CIMS)和计算机集成过程控制系统(CIPS)中,可编程序控制器正成为主要的控制设备,得到广泛应用
2)与通用的计算机控制系统比较西门子模块总代理上海代理商与通用的计算机控制系统比较,可编程序控制器可靠性提高的主要原因如下。
(1)可编程序控制器是为工业生产过程控制而专门设计的控制装置,它具有比通用计算机控制系统*简单的编程语言和*可靠的硬件。采用了经简化的编程语言,编程的出错率大大降低,而为工业恶劣操作环境设计的硬件使可靠性大大提高,可编程序控制器的可靠性较通用计算机控制系统的可靠性有较大提高
可编程序控制器是一种数字式的电子装置。它使用可编程序的存储器来存储指令, 实现逻辑运算、顺序运算、计数、计时和算术运算等功能,用来对各种机械或生产过程进行控制。
1982年,美国*电工**(International E1ectricalCommittee)颁布了可编程序控制器标准草案,1985年提交了*二版,1987年的*三版对可编程序控制器做了如下定义:
可编程序控制器是一种专门为在工业环境下应用而设计的数字运算操作的电子装置。它采用可以编制程序的存储器,用来在其内部存储执行逻辑运算、顺序运算、计时、计数和算术运算等操作的指令,并能通过数字式或模拟式的输入和输出控制各种类型的机械或生产过程。可编程序控制器及其有关的外围设备都应
西门子模块总代理上海代理商