Posts from...
Today, Thursday, April 24, 2014
Topic: Software, including programming, OS issues, etc.
from the opc communication department...
OPC tags stop updating...start once the tags are added again
Posted by lalas on 24 April, 2014 - 3:54 pm
Utilizing an opc client ..the values stopped updating after a while (20 days) .Once i added the tags again into the same group they start updating .Everything is fully licensed so it is not a licensing issue.
Topic: Engineering and workplace issues.
from the Forum department...
Water Treatment Plant Iconic Load
Posted by S D Jana on 24 April, 2014 - 3:37 pm
DM stream ionic load is lower than design in water treatment plant
Topic: Sensor technologies.
from the control department...
4 wire vs. 3 wire RTD
Originally posted by KAKIL on 3 October, 2007 - 12:00 am
What is the difference between 4 wire RTD and 3 wire RTD?
New Replies:
i have a question, some application, they connect RTD directly to control cabinet (without...
Topic: Local and wide area networking in factory automation.
from the Forum department...
Modbus Converters
Originally posted by dodgeybro on 23 April, 2014 - 6:33 am
Modbus Gateway v's Modbus Servers and Protocol converters.
New Replies:
I like to think of a Gateway as device which converts one protocol to another protocol. Because in...
By Lynn August Linse on 24 April, 2014 - 11:09 am -
First warning ... one vendor's "Modbus Gateway" is anothers "Modbus Converter"....
Topic: Communications systems and equipment.
from the Salse Department department...
GPRS data transmission
Originally posted by Goran on 22 March, 2014 - 10:30 am
Using GPRS modem to send data from PLC to OPC server on a PC with SCADA.
New Replies:
This application seems very similar to me, I have done something like that. Here is the GPRS...
Topic: Software, including programming, OS issues, etc.
from the INSTRUMENTATION department...
UREA FLOW METER
Originally posted by Arun Kumar on 14 April, 2014 - 4:20 pm
What type of flowmeter can be installed in a Urea duct as a source of FD and ID fan in the duct?
New Replies:
> What are you measuring? Just air flow? Thank you for your response. Sir, as it is a large...
Topic: Power generation equipment control.
from the Forum department...
Mark Vie PPDA IO Pack Fault
Originally posted by kwaku on 23 April, 2014 - 10:22 am
PPDA I/O pack on PDM card faulty?
New Replies:
kwaku, Your diagnosis would seem to be correct based on the information provided. My hesitation...
Topic: Power generation equipment control.
from the operation department...
HP & LP speed in GE gas turbine
Originally posted by GE on 24 April, 2014 - 12:38 am
What is the difference between HP & LP speed
New Replies:
Hi GE, HP and LP refer to 'High-Pressure' and 'Low-Pressure' shafts, and speeds. The pressures...
Originally posted by rajesh patil on 23 April, 2014 - 2:28 pm
why the modbus mapping register is visible at register address +/- 1 address.
New Replies:
> Guys who live in cubes write the code. Hence, it depends on whether the guy who > wrote...
Hi, the numbering is introduced in the official Modbus Application Protocol Specification (page...
Guys who live in cubes write the code. Hence, it depends on whether the guy who wrote the code...
This goes back to the early days of Modbus when it was strictly used for Modicon PLC's where Coil...
Topic: Engineering and workplace issues.
from the Electrical & Instrument department...
Bently Nevada axial vibration due to lightening strike
Originally posted by Kamran Shamim on 23 April, 2014 - 2:58 am
Technical query - Bently Nevada axial vibration due to lightening strike
New Replies:
I think that these two articles from Orbit magazine address quite well your problem: ...
Topic: Power generation equipment control.
from the Maintenance department...
Mark V TMR servo commands
Originally posted by Brian on 12 April, 2014 - 9:35 pm
Difference in servo command in TMR panel for second stage nozzle
New Replies:
Hi Brian, What is the application of this particular servo? Does this occur to one of the servos...
Originally posted by BrownPaper on 20 April, 2014 - 11:34 am
Difference between throttle pressure and 1st stage pressure
New Replies:
While not a direct answer to your query, I have used stage pressure as represenitive of steam...
With valves wide open, the 1st stage pressure/throttle pressure ratio will be a relatively constant...
Interesting. Is 1st stage pressure and Throttle pressure used to calculate throttle valve...
Topic: Sensor technologies.
from the Real puzzler department...
Thermocouple readings problem
Originally posted by Michelle on 22 April, 2014 - 10:22 pm
Took temperature readings with J thermometer but only had K type wire!
New Replies:
what you have to be careful of is that Type-K thermocouple wire, and Type-K extension wire are two...
Another control.com thread http://control.com/thread/1336501913 involved back calculating when...
Topic: PLCs and related questions.
from the Automation and EMS department...
Unity Pro communications
Originally posted by Bhadresh Sarvaiya on 22 April, 2014 - 6:49 am
Need help for communication of NOE with M340.
New Replies:
This is compatibility error due to upgrade of firmware in NOE. Likely Unity V5 does not support the...
Originally posted by Rzr on 24 August, 2012 - 7:11 am
Is there need for accessories like modules or adapters to connect the Magelis XBTGT6330 HMI to Modbus Plus network or it can be connected directly to the Modbus Plus network without using extra hardware?
New Replies:
Do you know what driver was used for Vijeo Designer for the Magelis to work with the Anybus-gateway...
Topic: Communications systems and equipment.
from the IEC-60870-5-101 Protocol &DNP-3 are same department...
IEC-60870-5-101 Protocol & DNP-3
Originally posted by ajay on 1 April, 2006 - 10:12 am
Is DNP-3 protocol is the same as IEC-60870-5-101
New Replies:
Sir, Can you suggest me what are the basic differences b/w IEC104 and IEC101 protocol....
Originally posted by rizki on 23 April, 2014 - 12:55 am
help me to connect Vijeo citect and unity pro xl
New Replies:
Hi Rizki, it is difficult to find comprehensive tutorial on your native language. I found link...
Topic: Engineering and workplace issues.
from the Automation List department...
difference between earthing and grounding
Originally posted by soujanya on 20 October, 2004 - 12:45 am
need to know the difference between earthing and grounding.
New Replies:
I think it is a term that means the same thing - a connection to earth. In any case, people make...
Yes there is quite difference between earthing and ground. in a simple way earthing protect the...
Topic: Engineering and workplace issues.
from the electrical engineering department...
% impedance of power transformer
Originally posted by ramesh on 5 August, 2008 - 1:12 am
Elaborate on % impedance of power transformer.
New Replies:
KS... do you mean the short-circuit level on the 6.6kV level increased from 40 to 63kA? ...
Hi Phil Can you kindly advise what is the effect of system fault level on transformer design. ...
Topic: PLCs and related questions.
from the Urgent department...
Time and Date in Honeywell control builder
Originally posted by Mostafa on 8 April, 2014 - 2:48 pm
How could use time and date in control module?
New Replies:
Hi Mostafa, I saw your pictures, please go to the CM tree at your left and under the root node...
Topic: Sensor technologies.
from the Instrumentation department...
Calculating LRV/ URV of a Bubbler Level System
Originally posted by Kazim on 22 April, 2014 - 12:56 am
How do you calculate the LRV and URV of a Bubbler type Level Transmitter?
New Replies:
first find the clearance of your dip tube. say if it is 200mm. total height of the tank =...
Your bubbler can not 'see' any head pressure lower than its elevation, so you can not measure any...
Topic: PLCs and related questions.
from the ENG department...
Triconex system
Posted by HAIRI on 23 April, 2014 - 1:48 am
What happens when Triconex system CPU fails?
Topic: PLCs and related questions.
from the Forum department...
Yokogawa error message
Originally posted by Nacer on 8 August, 2011 - 10:09 am
Yokogawa error message
New Replies:
You've basically created a tag without it being registered in the taglist. This can be done if you...
Topic: Human-Machine Interface and SCADA.
from the Automation List department...
Android tablet for HMI?
Originally posted by Ken E on 3 June, 2011 - 11:18 am
Using an Android tablet as an all in one PLC.
New Replies:
By Peter Fredriksson on 22 April, 2014 - 4:32 pm -
Hello, I hope you all will not see my post as a advertisement. We are a small family company...
Topic: PLCs and related questions.
from the Modbus department...
S7 PLC as a MODBUS slave
Originally posted by Fatima on 22 April, 2014 - 8:29 am
would like to make S7 PLC as a MODBUS slave and a PC Master MODBUS
New Replies:
Forgot to mention in my previous post. The reason I distinguished between tech and business aspects...
Have never done it using the Siemens Ethernet port, but I have done that on a 315-2DP using a...
Topic: PLCs and related questions.
from the gad trubine control system department...
moog servo valve operation
Originally posted by VK on 1 November, 2012 - 10:30 am
How does a MOOG servo valve operate?
New Replies:
Jyshen, You are most welcome....
Dear CSA, Thanks for your superb informative response. Your passion and sincerity to share your...
Posted by GRJS on 22 April, 2014 - 8:56 am
Measuring winding resistance in a delta connected transformer.
Topic: Human-Machine Interface and SCADA.
from the PSEB department...
TDC 3000
Originally posted by singhbvirk on 21 September, 2009 - 5:55 am
How to print tag nos. and descriptions of historised points in TDC 3000
New Replies:
Hi - anyone who is looking for similar information may find these information books very useful -...
Topic: Communications systems and equipment.
from the Forum department...
MODBUS Function code
Posted by Hemant on 22 April, 2014 - 3:16 am
MODBUS function code of address word
Originally posted by Detlev Neumann on 17 April, 2014 - 4:09 am
Could I say that with the following facts my device is MODUS-RTU compatible
New Replies:
Agreed. Other than noting that you should be as flexible as possible on serial parameters (and...

Your use of this site is subject to the terms and conditions set forth under Legal Notices and the Privacy Policy. Please read those terms and conditions carefully. Subject to the rights expressly reserved to others under Legal Notices, the content of this site and the compilation thereof is © 1999-2014 Nerds in Control, LLC. All rights reserved.

Users of this site are benefiting from open source technologies, including PHP, MySQL and Apache. Be happy.


Fortune
"Gee, Toto, I don't think we are in Kansas anymore."
Advertise here
Advertisement
our advertisers
Help keep our servers running...
Patronize our advertisers!
Visit our Post Archive