s7-1200 | 易学教程

Need clarity on opc ua server and opc ua client

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问题 I would like to create an application for industrial automation to do the following functionalities: Read values from PLC, SCADA, and DCA Process those values and notify failures to Supervisor and Technician I am new to the Industrial Automation industry and IoT, and I knew that we have OPC UA in place to rescue. I came across many websites and youtube videos to understand OPC UA and its predecessors (OPC DA, OPC A&E, OPC HDA). And I have installed matrikon OPC server and explorer (client) to

Snap7 writing to a S7-1200 PLC

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问题 I'm trying to write something to my Siemens PLC with a C++/CLI application. Reading is ok (except the first time it reads it gives odd values). But writing is doing something completely different then what I want. below you can find the code: private: void WriteSiemensDB() { byte* buffer; if (ConnectToSiemensPLC()) //Check if you are connected to PLC { String^ msg; int DBNumber = 2; bool NDR; //Getting the values 1 time so buffer has a value buffer = sPLC->ReadDB(DBNumber); //give variables a

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

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问题 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? 回答1: I would go with SNAP7 and python-snap7 libraries. Example on how to install it on a Raspberry pi found in this blog: http://simplyautomationized

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

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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? I would go with SNAP7 and python-snap7 libraries. Example on how to install it on a Raspberry pi found in this blog: http://simplyautomationized.blogspot.com/2014/12/raspberry-pi-getting-data-from-s7-1200.html Update: Video walkthrough on how to set it up:

博图中SCL程序的创建方式

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首先我们要清楚，因为更新换代的原因，博图不管在功能丰富性、操作简易性还是界面美观性上，对S7-1200/1500系列的支持都是高于S7-300/400的。这个分类里面我就不详述了，这一点在下面的程序创建上就能看出来。同样是Tia Poral V15平台。 S7-1200/1500 SCL程序的创建： 1、添加新块（OB块/FB块/FC块），语言选择SCL，新创建的块就是默认SCL语言编写。界面如下来源： https://www.cnblogs.com/fuyunjian/p/11725752.html

libnodave error while reading from Siemens s7-1200 (0x8104)

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问题 While checking s7nodave's EPICS device support for S7-1200 I've encountered a problem that refers to libnodave. When I'm try to read any memory address in PLC, IOC console reports an error: epics> 2014/05/19 14:20:41.964 Siemens-PLC error while reading 1 bytes from PLC address FB35. Status = context not supported. Step7 says:Function not implemented or error in telgram. That is libnodave status code 0x8104. When I've tried to search the web for this error code, all results were referencing to