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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
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-- George Jean Nathan
-- George Jean Nathan
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How to connect Wonderware to other SCADA system via OPC
New Replies:
By Wassim Daoud on 29 October, 2009 - 1:22 pm -
I see ... considering that it's a proprietary SCADA, I am hesitant on giving you any advise in...
We have a system working similar to what you describe, but the "central" level as you put...
It is a property SCADA system can support UNIX, LINUX and Windows....
Both local and central can control the field equipment. Of course, between them a mechanism should...
By Wassim Daoud on 28 October, 2009 - 12:45 pm -
What kind of Scada System are you planning on using on the Linux OS?
Wassim Daoud
Global...
Are you planning on using your central system for data collection and control or just data...
By Andrey Romanenko on 28 October, 2009 - 7:29 am -
First of all, it is good to hear Linux is advancing on the plant floor.
Although you may...
Any of you know how to minimize delay time in MODBUS RTU over RS-485 2-wire
New Replies:
By asaria on 28 October, 2009 - 11:48 am -
I had checked it. From panel, I tried to read data from slave using Modbus simulator, i got only 2s...
By Harvard on 26 October, 2009 - 4:44 pm -
RS485 (2 wire) is a half duplex communications path. Just like a 2 way radio one must KeyUp the...
By asaria on 26 October, 2009 - 10:24 am -
What do you mean by KeyUp and KeyDown timing?...
I'd check to see if the slave has a "response delay", or similar setting.
Also, since...
It is possible to get reply from logo in seconds if you can change/access modbus communication...
By Harvard on 25 October, 2009 - 11:32 pm -
Seems you probably have a KeyUp/KeyDown timing issue. The most common problem is the slave responds...
Modbus RTU master for versamax PLC
PIC and PC communication via USB
New Replies:
By nav on 26 October, 2009 - 9:35 am -
thanks bro.... i will try
...
You will need to program both the PC and the PIC to talk via USB.
On the PIC end, Microchip...
time synchronization in DCS system
New Replies:
By M.Bhaskar on 25 October, 2009 - 11:51 pm -
Hi All,
DCS system receive time synchronization in form of Pulse which can be defined for second...
The system clock for most systems nowadays are very unlikely to drift more than a seconds in a day....
By Ketan Lakhani on 17 October, 2009 - 4:29 am -
I feel that it is firstly required to understand as to why the synchronization is required. ...
By Y.K.JARIWALA on 16 October, 2009 - 2:00 am -
We are not very sure , but time synchronization plays very critical role in Multiple Node system we...
jianjian2112,
the target of time synchronization in DCS from GPS that if we have more than one...
Need procedure for replacing a TAC Xenta 302 controller on a TAC Vista/LonWorks Network
from the Automation List department...
Profibus communication problem between Beckhoff IPC and Siemens PLC
An IPC connected to a Siemens PLC as a slave module. When I restart the PLC while IPC running then PLC can't find the IPC hardware on the Profibus network.
New Replies:
By Jeff Chang on 21 October, 2009 - 4:28 am -
We download new GSD of Siemens et200m and set FC3101, Beckhoff Profibus cards, baud rate at 1.5 M...
how to multiplex RS485 slaves over single RS232 channel
New Replies:
>What exactly are you trying to do..
Hi Vance. Trying to do exactly what the two suggested...
Hi Patrick,
Thanks for the reply. Your product too does what we needed, but as I just said in...
By Patrick Lansdorf on 16 October, 2009 - 3:10 am -
Hi,
I think that there are a number of options that you have to choose from. I would use a...
By Vance Newman on 16 October, 2009 - 12:02 am -
What exactly are you trying to do.. For example.. Connect 3 slave (Remote) through modem to PC...
Distribute control of DCS over different operators.
New Replies:
By wilson on 19 October, 2009 - 10:27 am -
Dear friend,
All the DCS presently available has the feature you are looking for. you can set...
DP/PA Coupler in Siemens H System
Water/Gas Meter with Modbus/LonTalk/BACnet Compatibility
New Replies:
Hello Steve,
For your application, I recommend using a Sensus (or Sensus-compatible) water meter...
how a flow meter communicate
New Replies:
For your application, I recommend using a Sensus water meter and a Sensus gas meter, both of which...
Serial interface between Allen Bradley's Control Logix and Emerson Ovation DCS
New Replies:
By Alex Baloch on 18 October, 2009 - 12:22 pm -
Were you able to establish communication between the control logix plc and the ovation DCS? of so,...
Doc to configure the jumper of the hmi arcnet isa card
I have 3 Mark v units with 3 HMI (P2 +NT 4.0 +TCI 1.4 + cim 3.21) en the same arcnet network. one is crashed.
Can MicroLogic PLC read Modbus Holding Registers in the 5xxxx range?
New Replies:
By M Griffin on 17 October, 2009 - 1:43 pm -
Thanks to Mark for the correction. It appears that old versions of the Modbus spec did make some...
By Mark on 17 October, 2009 - 2:25 am -
Hello,
What Mr. Griffin said is 99.99999% accurate.
The current specification: MODBUS...
By M Griffin on 16 October, 2009 - 2:17 pm -
To make something clear about Modbus, this 0x, 1x, 3x, 4x, 4 digit, 5 digit stuff has *nothing* to...
The typical Modbus Address Scheme is :
0x = Digital Outputs (Bit)(Read / Write)
1x = Digital...
By Harvard on 15 October, 2009 - 11:31 am -
Try reading Register = 50102-40001 = 10101 = 0x2775...
What is the difference between GPS & NTP in the time synchronization concept?
A computer virus caused serious problems recently for an Australian electric utility.
New Replies:
By M Griffin on 16 October, 2009 - 4:37 pm -
In reply to Matt Warshawsky: I don't want to flog this issue to death, but there are a couple of...
By Matt Warshawsky on 15 October, 2009 - 4:24 pm -
It was never my intention to simply pass the same traffic over serial, but instead to use a simple...
By M Griffin on 15 October, 2009 - 2:06 pm -
In reply to Matt Warshawsky: I don't think we need to go to the lengths of installing serial...
Is it possible to use any RS232 to TCP converter or should I use a specific converter for Modbus?
New Replies:
By Harvard on 15 October, 2009 - 11:27 am -
I use a B&B ESP901 Single Port RS-232/422/485, as an example, and it can be used with any...
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