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Sparkman
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Array Electronics SR PLCs

03/23/2009 1:53 PM

Has anyone out there been able to communicate via C++ to an Array Electronics SR type PLC? I would like to use one for controlling switching for some automated test equipment running on a PC in the Windows environment.

Thanks,

Sparkman

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editorgbanalysts
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#1

Re: Array Electronics SR PLCs

03/27/2009 1:00 AM

I have not done this before though I have current active interest in the area mostly for control of Pollution Control Chemical Processes. So I did some digging up on the topic; and the only way I could see the architecture for starters is to associate the C++ functions within the PLC structured text logic or vice versa.

I then searched for an interface but did not find any. However I notice that the PLC codes could also be written in Assembly Language, .as , so I am thinking that since C++ also allows embedded as-codes, perhaps the best approach for implementing the architecture would be through as-codes using the gnu-compiler for compatibility.

I suggest this approach as it removes the need to buy special interfaces. In fact I believe that a whole interface could be written this way.

I hope that this helps

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Sparkman
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#2

Re: Array Electronics SR PLCs

03/27/2009 7:24 AM

I am coding using Borland C++ Builder and I have been able to see the token that the PLC sends out. However, I have not been able to ascertain the proper sequence or structure needed to actually control the thing. The PLC uses RS-485 for a communication line and that is pretty straight-forward. I just can't seem to get the command sequence to read or write the output states.

Thanks for the tip!

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editorgbanalysts
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#3
In reply to #2

Re: Array Electronics SR PLCs

03/27/2009 8:30 AM

RS-485, would not serial communication, would it? I am familiar with Boland C++ Compiler as I taught programming with it some years back.

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Sparkman
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#4

Re: Array Electronics SR PLCs

03/27/2009 8:58 AM

It is achieved using the serial port, just a bit different protocol.

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editorgbanalysts
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#5
In reply to #4

Re: Array Electronics SR PLCs

03/27/2009 9:06 AM

Alright so you are not using the Serial Comm Protocol then? I should look into it and communicate further with you through email. Meanwhile Good luck

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Sparkman
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#6

Re: Array Electronics SR PLCs

03/27/2009 9:12 AM

I am using the APRO series of components. Communicating isn't the problem. The problem is getting the correct command format to interogate or command the PLC.

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editorgbanalysts
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#7
In reply to #6

Re: Array Electronics SR PLCs

03/27/2009 11:29 AM

Thank you for the additional details.

I have now downloaded the SourceForge Open Source ASPRO components and the related docs. I should get back to you over the next several days after I have digested the contents of the docs.

Again, meanwhile Good luck.

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editorgbanalysts
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#8

Re: Array Electronics SR PLCs

03/29/2009 10:55 AM

I am sending you the feedback. Good luck

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