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- PC reliability?
- Windows, real time
- PID loops
- PCs vs. PLCs
- Replacing people
- MS 'monopoly'?
- Software quality
- Where do we go from here?
- Why pay?
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How to map variable length data to holding registers?
New Replies:
By Sebastian Seidel on 18 July, 2009 - 4:41 pm -
Thank you very much for the swift and in-depth response, without which I would most certainly have...
By M Griffin on 16 July, 2009 - 12:39 am -
You said that you're not sure about "the max data length of many variables". They're 32...
Need a Modbus RTU Master OPC Server as "Program Master"
New Replies:
"Program Master" and "Data Master" are Modbus-Plus terms. Modbus-Plus supports...
ProfiNet, Modbus/TCP and Ethernet/IP as options for industrial ethernet.
New Replies:
By M Griffin on 17 July, 2009 - 8:32 pm -
The legal situation for anyone wanting to implement Ethernet/IP is quite complicated. There was a...
By JR on 17 July, 2009 - 3:26 pm -
EtherNet/IP documentation is available (for a fee) from ODVA.org....
Talking to DH+ with a modern computer and old DOS software
New Replies:
By James Ingraham on 17 July, 2009 - 11:01 am -
1) I believe you mean ISA, not ide.
2)There is not going to be a solution for $500. List price...
Check out the DataLink Ethernet/IP Gateway to DH+ Solution. Although it costs $1,500 (more than...
In need of a software (or hardware) solution to read data out of a Sigma system on demand.
New Replies:
By M Griffin on 16 July, 2009 - 2:43 pm -
So far as I can tell, there are just two ways. They sell some integration boxes which have...
By Rav Panchalingam on 16 July, 2009 - 12:13 am -
Hi thanks, I may need to clarify my question. I don't need any help to read BACnet, in fact I've...
By M Griffin on 11 July, 2009 - 1:03 pm -
There are BACNET libraries on Sourceforge. I suggest that you try one of those. Since you'll have...
Shutdown logic signal between two DCS systems
New Replies:
Thanks Nick,
Actually (I must apologize)the communication required is between two independent...
By Nick Mellor on 5 July, 2009 - 11:19 pm -
If a SIL assessment has shown that a SIL rating is required for these valves then using serial...
In my experience I haven't come across any standards which says that shutdown through serial link...
These are two critical shutdown signals to trip-valves. As such we have not done this yet as we...
By Roy Matson on 30 June, 2009 - 10:49 am -
How critical are the shutdown signals? What will happen if you loose communications?
Have you...
Has anyone setup Modbus between DeltaV and Micrologix 1200?
New Replies:
By DSiler on 14 July, 2009 - 1:30 pm -
I have done it and if I recall correctly I had to slow the baud rate on the micrologix to 9600. For...
Not connection PLCS700-IBHLink-Computer . HELP !!!
Modbus TCP listener for handling multiple clients and making smooth communication including database storage.
New Replies:
By Mark on 8 July, 2009 - 12:11 pm -
Automated Solutions offers a Modbus Slave (server) ActiveX Control that can be used in C# Windows...
By M Griffin on 7 July, 2009 - 3:22 pm -
A "TCP listener"? Do you mean a Modbus/TCP server? The client sends a request to the...
We would like to monitor the Tx/Rx of our lease line connections, 9600 baud, for loss of connectivity
New Replies:
By Kelly Crist on 8 July, 2009 - 12:11 pm -
Thank you Paul,
the physical interface is a RS232 DB25 which connects to the RTU onsite. I've...
Communication problems with s7 and radio's
Looking for a GE Ifix MBE modbus ethernet V7.x driver
Which is the correct bits stop number with none parity?
New Replies:
By Francesco Savino on 3 July, 2009 - 3:07 am -
Before all,Thanks a lot for your answers.
The problem was born because two days ago i did some...
By David on 1 July, 2009 - 5:35 pm -
Yes, but as you've noticed, many do not use two stops for no parity.
In fact, I find it rarer to...
project using the Temco Thermostats (TSTAT5) which are run on Modbus communication (daisy chain connection)
New Replies:
By Benson Hougland on 2 July, 2009 - 5:29 pm -
Hello SK- I suggest posing your question to Opto 22 Product Support at support@opto22.com, or call...
e-net communication from PV600 to 2572a
New Replies:
I have been told I cannot communicate via e-net i/p directly to the CTI 2500 plc from a standard...
By Fred Loveless on 29 June, 2009 - 9:52 am -
What is are you finding confusing about the addressing? i have not configured the Enterprise driver...
Need information about layout of registers.
New Replies:
By Nick Mueller on 1 July, 2009 - 4:32 pm -
Thanks!
Your answer absolutely addressed the philosophical side of my problem.
There are...
By M Griffin on 30 June, 2009 - 9:55 am -
Yes, coils, discrete inputs, holding registers, and input registers are just different ways of...
By Mueller Nick on 30 June, 2009 - 1:03 am -
Hi!
Yes, I have read the ModBus docs. But the layout of registers, coils, inputs has so much...
By M Griffin on 28 June, 2009 - 11:04 pm -
There are four types of Modbus memory - Coils, Discrete Inputs, Holding Registers, and Input...
Common mode voltage measurement
New Replies:
One of the easiest ways to view a signal like this is to use a dual trace scope of sufficient BW. ...
What is the MODBUS RTU PROTOCOL format for ODD PARITY?
New Replies:
Parity is redundant and never normally used WHEN CRC error checking is implemented. Parity is not...
I'm seeking advice on a replacement device for an ADAM-6017, that's approximately the same size.
New Replies:
By M Griffin on 30 June, 2009 - 9:44 pm -
I've never bought anything from the following, so I can't exactly recommend them. However, you...
Trouble configuring Simatic NET OPC with a Schneider Quantum PLC as Master
seeking guide lines to prepare logic diagrams
New Replies:
By Salvador on 26 June, 2009 - 9:52 am -
Would you lease suggest a software to draw the diagrams. I tried to do that in AutoCAD, but it is...
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