blocks|key|2006222|text|在使用libnodave和OPC失败后，我创建了一个TCON、TSEND和TRECV通信工具。它在TCP上传输一个字节，并正常工作。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2006223|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

After failing with libnodave and OPC, I created a TCON,TSEND and TRECV communication thing. It transmits a byte over TCP and it works.

blocks|key|2006296|text|我会选择SNAP7和python-snap7库。有关如何在此博客中找到的树莓pi上安装它的示例：http://simplyautomationized.blogspot.com/2014/12/raspberry-pi-getting-data-from-s7-1200.html|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|2006297|更新：|style|BOLD|2006298|有关如何设置的视频演练：https://youtu.be/yJNEsI5KJxs|2006299|entityMap|0|LINK|mutability|MUTABLE|url|http://simplyautomationized.blogspot.com/2014/12/raspberry-pi-getting-data-from-s7-1200.html|1|https://youtu.be/yJNEsI5KJxs^0|1C|2K|0|0|0|3|0|C|S|1|0^^$0|@$1|2|3|4|5|6|7|T|8|@]|9|@$A|U|B|V|1|W]]|C|$]]|$1|D|3|E|5|6|7|X|8|@$A|Y|B|Z|F|G]]|9|@]|C|$]]|$1|H|3|I|5|6|7|10|8|@]|9|@$A|11|B|12|1|13]]|C|$]]|$1|J|3|-4|5|6|7|14|8|@]|9|@]|C|$]]]|K|$L|$5|M|N|O|C|$P|Q]]|R|$5|M|N|O|C|$P|S]]]]

I would go with SNAP7 and python-snap7 libraries. Example on how to install it on a Raspberry pi found in this blog:
<a href="http://simplyautomationized.blogspot.com/2014/12/raspberry-pi-getting-data-from-s7-1200.html" rel="noreferrer">http://simplyautomationized.blogspot.com/2014/12/raspberry-pi-getting-data-from-s7-1200.html</a>

Update:

Video walkthrough on how to set it up: <a href="https://youtu.be/yJNEsI5KJxs" rel="noreferrer">https://youtu.be/yJNEsI5KJxs</a>

blocks|key|367382|text|我会在PC端使用来更改可编程控制器中的一些M标记或DB标记的值。您可以轻松地创建一个梯级，它将监视此标记并执行进一步的操作。尽管libnodave本身不支持Python，但您可以找到python包装器。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|367383|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

I would use <a href="https://sourceforge.net/projects/libnodave" rel="noreferrer">libnodave</a> on PC side to change value of some M tag or a DB tag in a PLC. You can easily make a ladder rung which will monitor this tag and execute further actions. Although libnodave doesn't support Python natively, you can find a python wrapper <a href="http://pastebin.com/p6q0te6R" rel="noreferrer">here</a>.

blocks|key|2006142|text|好吧，在谷歌上快速搜索“python+rs232”，就会出现some+site关于使用pySerial通过rs232进行机器人控制的内容。因此，如果您知道如何将小部件连接到rs232，则可以采用这种方法。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|2006143|entityMap|0|LINK|mutability|MUTABLE|url|http://www.varesano.net/blog/fabio/serial%2520rs232%2520connections%2520python|1|http://pyserial.sourceforge.net/^0|U|9|0|17|8|1|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@$A|O|B|P|1|Q]|$A|R|B|S|1|T]]|C|$]]|$1|D|3|-4|5|6|7|U|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]|L|$5|G|H|I|C|$J|M]]]]

Well, a quick google of 'python rs232' turned up <a href="http://www.varesano.net/blog/fabio/serial%20rs232%20connections%20python" rel="nofollow">some site</a> talking about doing robotics controls through rs232 using <a href="http://pyserial.sourceforge.net/" rel="nofollow">pySerial</a>. So if you know how to hook your widget up to rs232, you could go that route.

blocks|key|367495|text|Rothenbacher+GmbH有一个名为"S7connector“的商业库(显然它不是sourceforge上的"s7connector”)。它是针对.NET框架的，因此可以与IronPython一起使用。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|367496|它可以与S7-1200+PLC配合使用。您只需确保您想要读取/写入的数据库不是优化的S7-1200样式的数据库，而是S7-300/400兼容的数据库，这是您可以在TIA门户中创建数据库时设置的选项。这个库还允许读写所有的I/O端口--“影子寄存器”(不确定它们的正式名称是什么)，以及直接读写，覆盖前者。|367497|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

There is a commercial library called "S7connector" by Rothenbacher GmbH (obviously it's not the "s7connector" on sourceforge).
It is for the .NET framework, so could be used with IronPython.

It does work with S7-1200 PLCs. You just have to make sure a DB you want to read from / write to is not an optimized S7-1200 style DB, but a S7-300/400 compatible one, an option which you can set when creating a DB in TIA portal.
This lib also allows to read and write all I/O ports - the "shadow registers" (not sure what they're called officially) and directly as well, overriding the former.

blocks|key|2006329|text|有几个Modbus+TCP客户端可用于Python，我已经成功地使用了pyModbusTCP。TIA+Portal+S7-1200的IDE具有Modbus服务器功能，您可以将该功能加载到您的PLC中，从而允许您直接读取和写入PLC。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2006330|https://support.industry.siemens.com/cs/ww/en/view/83130159|offset|length|2006331|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|1N|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|N|8|@]|9|@$D|O|E|P|1|Q]]|A|$]]|$1|F|3|-4|5|6|7|R|8|@]|9|@]|A|$]]]|G|$H|$5|I|J|K|A|$L|C]]]]

There are several Modbus TCP Clients available for Python, I have used pyModbusTCP successfully. TIA Portal the IDE for the S7-1200 has Modbus Server function that you can load to your PLC that will allow you to read and write directly to the PLC.

<a href="https://support.industry.siemens.com/cs/ww/en/view/83130159" rel="nofollow">https://support.industry.siemens.com/cs/ww/en/view/83130159</a>

blocks|key|367409|text|与S7-1200+PLC+cpu通信的另一种最佳方式是使用OPC+UA或Classic+OPC+(统称为OPC+DA。)Libnodave适用于S7-300和S7-400，不适用于S71200+(2.x固件)。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|367410|如果您使用第三方解决方案与S7-1200+(或S7-1500)通信，则必须通过允许put和get机制来降低PLC的安全级别。Put和get使用起来纯粹是坏事。您可以为每个进程打开CPU的内存。不要再使用它们了。西门子实际上应该阻止这一点。|367411|这适用于S7-1200的所有固件版本。西门子推送您使用OPC+UA作为PLC默认通信的人员。什么是有意义的，因为OPC是工业4.0和IIoT的协议。|367412|编辑:重写所有内容。信息已经非常过时了。如果您使用固件2或3+1200，请考虑更换或升级。这些版本不再受支持，并包含蠕虫问题。|367413|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|J|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|K|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|L|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|M|8|@]|9|@]|A|$]]|$1|H|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|I|$]]

Ther best way to communicate with S7-1200 PLC cpu's is with OPC UA or Classic OPC (ommonly known as OPC DA. ) Libnodave is made for S7-300 and S7-400 not for S71200 (2.x firmware). 

If you use a third party solution to communicate with S7-1200 (or S7-1500) you have to decrease the security level at the PLC by allowing the put and get mechanism. Put and get are pure evil to use. You open the memory of the CPU for every process. Don’t use them anymore. Siemens should actually block this. 

This applies for all firmware release for S7-1200.
Siemens pushes people you use OPC UA as default communication from PLC. What makes sense, because OPC UA is the protocol for industry 4.0 and IIoT. 

Edit: rewrite everything. Info was heavily outdated.
If you use a firmware 2 or 3 1200, consider replacement or upgrade. These versions are no longer supported and contains the worm issue.

I am running a process on a S7-1200 plc and I need it to send a start signal to my python script, after the script is done running it needs to send something back to the plc to initiate the next phase. Oh, and it has to be done in ladder.

Is there a quick and dirty way to send things over profibus or am I better off using just a RS232 thing?

How can I communicate between a Siemens S7-1200 and python?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我正在S7-1200plc上运行一个进程，我需要它向我的python脚本发送一个启动信号，在脚本运行完成后，它需要向plc发送一些东西来启动下一阶段。哦，而且它必须在梯子上完成。有没有一种又快又脏的方式通过profibus发送东西，或者我最好只使用RS232的东西？

问如何在西门子S7-1200和python之间进行通信？
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