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Trouble establishing communications between a Quantuam 311 CPU programmed in Unity and Wonderware InTouch 9.5 and SA85 I/O Server ver 8.1
New Replies:
Set the serial port parameters for the M340 cpu by "double clicking" on the serial port....
Illegal response size error message on ABB PLC
New Replies:
By Patrick Lansdorf on 15 September, 2009 - 7:32 am -
Hi there,
Are you sure that the exception, 04, is Illegal Response Length. The modbus spec. says...
I need to control a FC51 Danfoss VFD with LS PLC.
I need to start , stop & jog the drives.
I need to start , stop & jog the drives.
New Replies:
The answer to your questions will take a bit more space than available on this forum. I recommend...
By Derik on 14 September, 2009 - 1:32 pm -
I , an application engineer from LS Automation & Danfoss Engineer, tried to establish the...
Dear Mr. Bruce,
Thank you very much. I will try these setting once I am back in office tomorrow...
Question about how to develop a software which is communicating on modbus/TCP
New Replies:
By M Griffin on 11 September, 2009 - 5:27 pm -
In reply to JonC:
I read your blog post, and it sounded interesting. How did you do the remote...
By JonC on 11 September, 2009 - 11:55 am -
Hey all,
Don't know if anyone is still working on this. I have written a great deal of code...
Log data from serial ports.
New Replies:
By M Griffin on 10 September, 2009 - 11:58 pm -
As for manipulating the Modbus packets, that is what the links to libmodbus and pvbrowser were for....
I justed wanted to post the code that I have so far and get some feedback. Go easy on me, I am not...
Thank you for the link.
I implemented this process and it is working fine. But now I am trying...
I made a mistake on the link. Try this one...
http://scadametrics.com/blog/?p=22
...
Glad that my solution was helpful, Vaneeth.
My snooper program was written in C and compiled in...
Funny, I actually thought of doing that but never got to making the cables. Now that I know it...
By M Griffin on 6 September, 2009 - 10:50 pm -
For examples of Modbus communications, you might want to look at the following:
This is a C...
Vaneeth,
I did something like this once, but with a twist that may make your job easier.
In...
By Vineeth on 6 September, 2009 - 3:31 pm -
I am gonna take your suggestions and implement this.
I don't know python at all only C and C++....
Using our open source project
http://pvbrowser.org
it should be possible to do.
Within our...
By M Griffin on 5 September, 2009 - 10:24 pm -
To make your program asynchronous, you just have to make sure that nothing in your program halts in...
Thank you for answering Griffin.
I plan to make my program work in only one mode at a time. So...
By M Griffin on 4 September, 2009 - 8:29 pm -
I think you would need to do something like this:
1) Detect the start of the message and reset...
I want to understand whether it makes sense to convert to a report by exception basis in PLCs and whether it is even possible?
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By M Griffin on 7 September, 2009 - 1:07 pm -
From what I remember about DF1, if you get rid of the AQ/NAQ then you have the same cycle as...
By M Griffin on 4 September, 2009 - 12:37 am -
As another person has mentioned, there is only so much performance you can squeeze out of a 1200...
Ok, Maybe I come from an environment of complexity, because we would never send back all the analog...
By M Griffin on 2 September, 2009 - 10:14 pm -
Like almost all protocols, Modbus is strictly client/server (or master/slave). You poll the server...
I need to send this message from ladder program to this slave and receive the answer message to PLC or PC
New Replies:
By M Griffin on 5 September, 2009 - 1:41 pm -
All you've told us is that you have successfully sent a Modbus request from some sort of PC or PLC...
yes,
I need to send this message to Slave Device ( Digital Multimeter )
08 04 00 0F 00 02 41...
By M Griffin on 3 September, 2009 - 12:49 pm -
You have provided quite a bit of detail. However, you have neglected to include an actual question....
Looking for a free modbus driver that will work with .NET.
New Replies:
By M Griffin on 23 August, 2009 - 11:13 am -
In reply to Tim: What are you trying to do? What features do you need?
I have a free stand...
By Tim on 22 August, 2009 - 9:46 pm -
> I'll keep you posted and let you know what I figure out. <
Wondering if you've decided...
Modbus communication problems with Telemeq. Altivar 31. AB micrologix 1400ML.
Convert SIMATIC to MODBUS address
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To poll Address 11, Reg 40001 for 2 Regs:
0B 03 00 00 00 02 C4 A1
To poll Address 12 register...
Need a 'software serial port' that will allow my modbus RTU software to communicate with a modbus TCP/IP device
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By Paul Wacker on 12 August, 2009 - 2:48 pm -
Glyn,
If I understand correctly, you're looking to connect your BMS logging system via RS-232...
I think you should use APC-Aftek's Protocol Converter (APC) series provide a solution for reliable...
I don't know about a software solution, but I have experience using the Digi One IAP, which...
Cable length limitations for the DP-PA couplers and LInk
Web HMI for HVAC
New Replies:
By Mark on 1 August, 2009 - 4:52 pm -
Hello,
PeakHMI might be a good fit for you.
Good luck,
Mark
http://www.peakhmi.com/...
Modbus Connection AB CompactLogix - Mitsubishi A2ACPUcomm
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By James on 23 July, 2009 - 9:28 am -
Yes, we want to use compactlogix as a master then Mitsubishi A2ACPU as a slave. Do you mean that we...
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