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Thermal Overload
The threads that wouldn't die...
- PC reliability?
- Windows, real time
- PID loops
- PCs vs. PLCs
- Replacing people
- MS 'monopoly'?
- Software quality
- Where do we go from here?
- Why pay?
- PC reliability?
- Windows, real time
- PID loops
- PCs vs. PLCs
- Replacing people
- MS 'monopoly'?
- Software quality
- Where do we go from here?
- Why pay?
Fortune
Down with categorical imperative!
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Is it possible to use any RS232 to TCP converter or should I use a specific converter for Modbus?
New Replies:
By Fred Loveless on 15 October, 2009 - 10:04 am -
Modbus over TCP is what you get when you use a straing serial to ethernet converter. This is...
A computer virus caused serious problems recently for an Australian electric utility.
New Replies:
Michael,
I think that I am more or less in agreement with your sentiment. The problem I have is...
By Andrey Romanenko on 15 October, 2009 - 8:08 am -
>OK, here is an idea to solve the problem: instead of connecting the business network and the...
By Matt Warshawsky on 15 October, 2009 - 3:32 am -
OK, here is an idea to solve the problem: instead of connecting the business network and the...
By Matt Warshawsky on 15 October, 2009 - 3:18 am -
Yes, you are correct on everything you said. In my opinion, the reason there are so many security...
By M Griffin on 14 October, 2009 - 8:19 pm -
In reply to DaveMH: You said: "Ultimately the responsibility for security lies with those on...
By M Griffin on 14 October, 2009 - 7:17 pm -
In reply to Matt Warshawsky: It's just as well that you added those remarks in your second reply,...
By Matt Warshawsky on 14 October, 2009 - 12:35 pm -
I guess I should add:
A firewall is actually just a piece of software running on an embedded...
By Matt Warshawsky on 14 October, 2009 - 12:14 pm -
In response to the various posts:
A firewall with no open ports (i.e. doesn't let any traffic...
By DaveMH on 14 October, 2009 - 8:21 am -
Michael
I don't think it is entirely fair to say that all vendors wash their hands and say it is...
By M Griffin on 13 October, 2009 - 9:35 pm -
In response to various posts: I was aware of the Sydney Morning Herald report, but that was one of...
By M Griffin on 13 October, 2009 - 8:45 pm -
In reply to Dilip: Standard routers and firewalls can help somewhat with older types of worms, or...
Hello Michael,
Thank you for posting this as I am trying to keep some kind of log on incidents...
And here
...
We are also a 24x7 manufacturing unit having three standalone SCADA running on Windows platform. I...
By Andrey Romanenko on 13 October, 2009 - 8:30 am -
Hello,
I agree with Michael's ideas on the replacement of the bridge with a more robust OS and...
By M Griffin on 13 October, 2009 - 3:06 am -
In reply to RK Sastry: I can imagine a number of ways to improve your system. However the fact that...
I am also interested in knowing the details about this case. In our installation, the SCADA/PLC...
Want to connect a PLC to a existing Ethernet network..
New Replies:
- First, you have to see the processor from RSLinx. If you do, you should have no problems.
-...
time synchronization in DCS system
Can MicroLogic PLC read Modbus Holding Registers in the 5xxxx range?
New Replies:
By Patrick Lansdorf on 15 October, 2009 - 3:02 am -
Hi,
I cannot answer if a MicroLogic PLC can read 5xxxx registers. But if it cannot, I would...
RTU / TCP mapping
New Replies:
By M Griffin on 14 October, 2009 - 6:34 pm -
In a typical Modbus RTU to TCP gateway the data stays the same. It's just the wrapper around the...
By Fred Loveless on 14 October, 2009 - 2:32 pm -
Yes it will remain the same. The address structure is exactly the same....
Ethernet & TCP/IP
New Replies:
By Riyazuddin on 13 October, 2009 - 3:08 am -
Ethernet Address (or MAC) is number that represent Network card & TCP/IP number is number...
need to link two modbus master devices
New Replies:
By Darrin Hansen on 12 October, 2009 - 10:18 am -
ICC also sells such a gateway, which has multiple ports (2X RS-485 and 1X RS-232) that can...
By Patrick Lansdorf on 12 October, 2009 - 5:00 am -
Hi dexdyne,
HMS has a gateway that will fit your application, connecting two Modbus RTU...
Need Assistance Integrating a WDPF QLC Card to an Allen Bradley 1770KF2 module
New Replies:
By Joel Tedder on 12 October, 2009 - 10:09 am -
Hello, have you reviewed the information in Westinghouse Manual U0-1130? ...
Need a PLC that runs on 12 volts and supports IEC 1131-3 Structured Text.
New Replies:
Beckhoff has a large range of controllers that use their Twincat IEC 6-1131 software, allow you to...
Does TwinCAT have Function Blocks for TCP/IP?
How to put to master in the same Modbus bus RS485
New Replies:
We manufacture a Gateway that allows two Masters over the same Modbus Slave devices. It is our DX...
By L.M. on 5 October, 2009 - 9:09 am -
It is possible to use master multiplexer.
For example:...
By dixinke on 5 October, 2009 - 12:34 am -
In the modbus network, there should no more than one master running at the same time....
By Lorne on 28 September, 2009 - 10:03 am -
Check out the PLC09 Arbitrator (www.calta.com). It was developed for exactly this application.
...
By Patrick L on 28 September, 2009 - 2:58 am -
Hi There,
HMS makes a gateway that is Modbus RTU slave to Modbus RTU slave. Connect one master...
Remote of Speedtronic Mark V
New Replies:
OPC is your best bet.
Talk to the various OPC makers to see if any of them will run on WinNT...
If i send the command(010300210001, crc, crc) using serial port in VB.NET. I don't get any response.
New Replies:
The tutorial actually is great and should answer all you questions but just to add...
Point 2.) ...
> 1.) You have got to set up the port - Port Number, Baud rate, start/stop bits, data bit,...
Unfortunately you are a long way off the mark.
1.) You have got to set up the port - Port...
I am a newbie also, maybe you are closing the port before info or string is read. vb has examples...
Connectivity of HMI & AC 800F with multiple nodes in the network using Profibus cable.
S7 313C-2DP set as a DP Slave but a Master also appears on the network at same node
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