西门子PLC模块武汉南昌总代理

西门子plc模块武汉南昌总代理
有关的外围设备，都应按照方便与工业系统联成一个整体、易于扩充其功能的原则设计。
1.2　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。

networktopology and network configuration

installation of a ring topology with the scalance xf204-2ba.

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:

length of the twisted pair line between twoscalance xf-200ba switches:
max. 100 m with ie fc cable andie fc rj45 plug 180 with busadapter ba rj45. bymeans of the ba 2xrj45vd ha, it is also possible to achieveelectrical cabling lengths of up to 1 000 m.

ip address:西门子plc模块武汉南昌总代理
the ip address is assigned by means of the dhcp (dynamic hostconfiguration protocol). if there is no corresponding server in thenetwork, the ip address can be assigned using the supplied softwaretool pst (primary setup tool) or step 7/tia portal.
scalance xf204-2ba device configuration is with step 7 or thetia portal.

optimal design of a ring topology with scalance xf-200ba andscalance xc-200

commissioning anddiagnostics西门子plc模块武汉南昌总代理

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:

voltage/power

errors西门子plc模块武汉南昌总代理

redundancy

ethernet communication via 2, 4 or 8-wire copper cables forcommunication up to 1 000 m with vd technology

technical specifications

articlenumber

6gk5204-2aa00-2gf2

6gk5204-0ba00-2gf2

product type designation

scalance xf204-2ba

scalance xf204

product options

xf-200 base device without mounted busadapter

xf-200 base device with mounted busadapters

transferrate

transfer rate

10 mbit/s, 100 mbit/s

interfaces forcommunication integrated

number of electrical connections

● for networkcomponents or terminal equipment

0

4

interfacesother

● for signalingcontact

1

1

● for powersupply

type of electrical connection

2-pole terminal block

2-pole terminal block

design of the removable storage

● c-plug

yes

yes

signalinputs/outputs

operating voltage of the signaling contacts

● at dc ratedvalue

24 v

24 v

operational current of the signaling contacts

● at dcmaximum

0.1 a

0.1 a

supplyvoltage, current consumption, power loss

product component connection for redundant voltage supply

type of voltage 1 of the supply voltage

dc

● supply voltage1 rated value

● power loss [w]1 rated value

8.6 w

8.6 w

19.2 ... 28.8 v

19.2 ... 28.8 v

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plc模块武汉南昌总代理
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plc模块武汉南昌总代理
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plc模块武汉南昌总代理