Posts from...Today, Friday, April 25, 2014
from the opc communication department...OPC tags stop updating...start once the tags are added again
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.
from the Forum department...Water Treatment Plant Iconic Load
DM stream ionic load is lower than design in water treatment plant
from the control department...4 wire vs. 3 wire RTD
What is the difference between 4 wire RTD and 3 wire RTD?
By edie on 24 April, 2014 - 3:15 pm -
i have a question, some application, they connect RTD directly to control cabinet (without...
from the Forum department...Modbus Converters
Modbus Gateway v's Modbus Servers and Protocol converters.
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"....
from the Salse Department department...GPRS data transmission
Using GPRS modem to send data from PLC to OPC server on a PC with SCADA.
This application seems very similar to me, I have done something like that. Here is the GPRS...
from the INSTRUMENTATION department...UREA FLOW METER
What type of flowmeter can be installed in a Urea duct as a source of FD and ID fan in the duct?
> What are you measuring? Just air flow? Thank you for your response. Sir, as it is a large...
from the Forum department...Mark Vie PPDA IO Pack Fault
PPDA I/O pack on PDM card faulty?
kwaku, Your diagnosis would seem to be correct based on the information provided. My hesitation...
from the operation department...HP & LP speed in GE gas turbine
What is the difference between HP & LP speed
Hi GE, HP and LP refer to 'High-Pressure' and 'Low-Pressure' shafts, and speeds. The pressures...
from the Forum department...Modbus mapping registor reading at register plus 1
why the modbus mapping register is visible at register address +/- 1 address.
> Guys who live in cubes write the code. Hence, it depends on whether the guy who > wrote...
By Jay on 24 April, 2014 - 1:34 am -
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...
By W.L. Mostia on 23 April, 2014 - 6:15 pm -
This goes back to the early days of Modbus when it was strictly used for Modicon PLC's where Coil...
from the Electrical & Instrument department...Bently Nevada axial vibration due to lightening strike
Technical query - Bently Nevada axial vibration due to lightening strike
I think that these two articles from Orbit magazine address quite well your problem: ...
from the Maintenance department...Mark V TMR servo commands
Difference in servo command in TMR panel for second stage nozzle
Hi Brian, What is the application of this particular servo? Does this occur to one of the servos...
from the Forum department...Turbine Throttle Pressure and 1st Stage Pressure
Difference between throttle pressure and 1st stage pressure
By jfb on 23 April, 2014 - 9:27 pm -
While not a direct answer to your query, I have used stage pressure as represenitive of steam...
By Dave Amundson on 23 April, 2014 - 9:23 am -
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...
from the Real puzzler department...Thermocouple readings problem
Took temperature readings with J thermometer but only had K type wire!
By d- on 23 April, 2014 - 4:46 pm -
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...
from the Automation and EMS department...Unity Pro communications
Need help for communication of NOE with M340.
By Brian Cervi on 23 April, 2014 - 4:16 pm -
This is compatibility error due to upgrade of firmware in NOE. Likely Unity V5 does not support the...
from the Forum department...How to connect Magelis XBTGT6330 to Modbus Plus Network
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?
By DH on 23 April, 2014 - 10:52 am -
Do you know what driver was used for Vijeo Designer for the Magelis to work with the Anybus-gateway...
from the IEC-60870-5-101 Protocol &DNP-3 are same department...IEC-60870-5-101 Protocol & DNP-3
Is DNP-3 protocol is the same as IEC-60870-5-101
By Nikhil on 23 April, 2014 - 10:14 am -
Sir, Can you suggest me what are the basic differences b/w IEC104 and IEC101 protocol....
from the Forum department...How To connect Vijeo citect with Untiy Pro XL
help me to connect Vijeo citect and unity pro xl
By Ikhtiander on 23 April, 2014 - 9:11 am -
Hi Rizki, it is difficult to find comprehensive tutorial on your native language. I found link...
from the Automation List department...difference between earthing and grounding
need to know the difference between earthing and grounding.
By Bob Peterson on 23 April, 2014 - 8:45 am -
I think it is a term that means the same thing - a connection to earth. In any case, people make...
By Tarkeshwar on 23 April, 2014 - 1:06 am -
Yes there is quite difference between earthing and ground. in a simple way earthing protect the...
from the electrical engineering department...% impedance of power transformer
Elaborate on % impedance of power transformer.
KS... do you mean the short-circuit level on the 6.6kV level increased from 40 to 63kA? ...
By KS on 22 April, 2014 - 7:48 pm -
Hi Phil Can you kindly advise what is the effect of system fault level on transformer design. ...
from the Urgent department...Time and Date in Honeywell control builder
How could use time and date in control module?
By Robert Perez on 23 April, 2014 - 6:56 am -
Hi Mostafa, I saw your pictures, please go to the CM tree at your left and under the root node...
from the Instrumentation department...Calculating LRV/ URV of a Bubbler Level System
How do you calculate the LRV and URV of a Bubbler type Level Transmitter?
By Casualguy on 23 April, 2014 - 5:08 am -
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...
from the ENG department...Triconex system
What happens when Triconex system CPU fails?
from the Forum department...Yokogawa error message
Yokogawa error message
By Steve Martin on 23 April, 2014 - 12:10 am -
You've basically created a tag without it being registered in the taglist. This can be done if you...
from the Automation List department...Android tablet for HMI?
Using an Android tablet as an all in one PLC.
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...
from the Modbus department...S7 PLC as a MODBUS slave
would like to make S7 PLC as a MODBUS slave and a PC Master MODBUS
By Steve Myres on 22 April, 2014 - 1:27 pm -
Forgot to mention in my previous post. The reason I distinguished between tech and business aspects...
By Steve Myres on 22 April, 2014 - 12:14 pm -
Have never done it using the Siemens Ethernet port, but I have done that on a 315-2DP using a...
from the gad trubine control system department...moog servo valve operation
How does a MOOG servo valve operate?
Jyshen, You are most welcome....
By Jyshen on 22 April, 2014 - 6:00 am -
Dear CSA, Thanks for your superb informative response. Your passion and sincerity to share your...
from the Forum department...Winding Resistance Measurement - Delta Connected Transformer
Measuring winding resistance in a delta connected transformer.
from the PSEB department...TDC 3000
How to print tag nos. and descriptions of historised points in TDC 3000
By Tim Haywood on 22 April, 2014 - 6:05 am -
Hi - anyone who is looking for similar information may find these information books very useful -...
from the Forum department...MODBUS Function code
MODBUS function code of address word
from the Forum department...Can I say my device is MODBUS-RTU compaible when.....
Could I say that with the following facts my device is MODUS-RTU compatible
By Steve Myres on 21 April, 2014 - 4:28 pm -
Agreed. Other than noting that you should be as flexible as possible on serial parameters (and...
We are all worms. But I do believe I am a glowworm.
-- Winston Churchill