Siemens PLC to C/C++

Oubax

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• Oct 13, 2016

• #1

Hi, guys...

What is the best way to link Siemens PLC and C/C++ programs ?

 

Bratt

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• Oct 13, 2016

• #2

Have a look at SIMATIC WinAC ODK

 

grnick50

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• Oct 13, 2016

• #3

You can check this out:

http://w3.siemens.com/mcms/programm...ntroller-odk/pages/default.aspx?ismobile=true

 

allexkym

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• Oct 14, 2016

• #4

The question is about C/C++, but in case of C# you can use snap7 (Step 7 only). It is an open source code library.

 

TurpoUrpo

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• Oct 14, 2016

• #5

It depends on your needs. What is it that you need linked to?

 

Oubax

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• Oct 14, 2016

• #6

TurpoUrpo said:

It depends on your needs. What is it that you need linked to?

Click to expand...

Import Tags from Siemens PLC for treatment purpose in C/C++ programs, Then give a feedback in real time.

 

Last edited: Oct 14, 2016

TurpoUrpo

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• Oct 14, 2016

• #7

How much tags? How realtime it needs to be? Is this all new design or are you adding new functionality to existing equipment?

 

Oubax

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• Oct 14, 2016

• #8

Tags: about 5000 Tags
Response time: <=1us
Can explain the difference between the two cases? How the communication should if i have new design, and if it's just about adding new functionality to existing system/equipment ?

 

JesperMP

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• Oct 14, 2016

• #9

5000 tags in less than 1 micro-second !?

If this is 5000 floating point tags, then it is 20000 Bytes, and it will take approx 100 read cycles, since Siemens S7 can execute approx 240-250 bytes per read/write request.
Something like 500 ms - 1 s response time is more realistic.

I wonder what you are doing with 5000 tags every microsecond.

 

JesperMP

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• Oct 14, 2016

• #10

Oh by the way, if this is a program for a Windows platform, how do you achieve an update time in the micro-second region ?
Regular Windows tasks execute in the 10 milli-second region. That is milli-seconds not micro-seconds.

 

Oubax

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• Oct 14, 2016

• #11

JesperMP, It's just design.
I'm talking about handling 5000 tags, but for some of this tags i need the shortest possible response time.
According to your remark about update time in windows platform, the Microsecond it's impossible, So Mr JesperMP can you suggest some solution ?

 

JesperMP

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• Oct 14, 2016

• #12

Start by describing exactly what you have to achieve.

 

y2kmfic

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• Oct 14, 2016

• #13

Give Libnodave a try. Works pretty well and it's free.
http://libnodave.sourceforge.net/