Posts from...
Today, Monday, October 20, 2014
Topic: Software, including programming, OS issues, etc.
from the How far can I stretch the standard department...
How Strictly Should the MODBUS Addressing and Data Models Be Followed?
Originally posted by MikeAtCalidus on 16 October, 2014 - 5:50 am
How flexible can the Addressing and Data Models be with regard to the width and alignment of objects accessed through read/write register functions?
New Replies:
By Lynn August Linse on 20 October, 2014 - 12:27 pm -
Mark, I can only shrug, reporting what I've seen. As I said, I find it annoying, and do as I...
Hello, What if the master uses two reads and the combination of two reads fetches the complete...
By Lynn August Linse on 20 October, 2014 - 9:30 am -
I have seen small products demand a read starts at 'beginning' (offset 0). I've also seen products...
Considering the answers above, would it be acceptable for the server to respond with an ILLEGAL...
Hello, >...is it more likely to make people reject the product as being utterly...
> Would a Modbus server with register greater than 16 bits be useable? No, It would be a...
Topic: Power generation equipment control.
from the Power operation department...
High pressure turbine bypass system
Originally posted by Zouhen on 17 October, 2014 - 5:19 pm
During Turbine Low vacuum Trip what is the position of high pressure turbine bypass control valve
New Replies:
Do you have any drawings? I would think there would be more to BPV logic than just a low vacuum...
Dear Gutman thank you for your reply. the boiler is reheater boiler with hp bypass. Please...
first, I have never seen a CCP, nor a unit with multiple bypass. I have worked nukes with a single...
Dear, What type of boiler you have, reheater provided, hp bypass will provide steam to reheater...
Dears, Actually turbine hp bypass cv when Turbine low vacuum trip it will open and keep the...
Dear Zouhen In this case when Low vacuum Turbine Trip, both LP and HP pressure turbine bypass...
Topic: Communications systems and equipment.
from the Confused Engineers department...
Allen-Bradley Ethernet to Fanuc CNC
Posted by David on 20 October, 2014 - 11:26 am
Communicating to Fanuc CNC controller from Allen-Bradley Compact Logix???
Topic: Power generation equipment control.
from the I&C department...
Westinghouse W251B11 wet compression
Originally posted by Napster225 on 16 October, 2014 - 7:55 am
Power augmentation by direct wet compression on W251B11 gas turbines
New Replies:
Ahem, > This technology is widely being used in today's combined-cycle and co-gen GT >...
This technology does increase the power output as well as the life of the GTs'.You may refer to...
Topic: Communications systems and equipment.
from the Forum department...
RS485 to Analog Input Conversion
Originally posted by cherrypi on 20 October, 2014 - 3:38 am
Is it possible to convert (multiple) readings being transmitted through RS-485 communication to analog signals?
New Replies:
With all due respect, I would be extremely reluctant to use wireless sensors in an ESD application....
Topic: PLCs and related questions.
from the Automation List department...
Connecting an Analog I/O Module to a Delta PLC
Originally posted by CauÍ on 15 October, 2014 - 4:10 pm
Having problems connecting an analog I/O module to my Delta PLC
New Replies:
> Should be the +I and Comm.... Please verify the voltage across this. > it should be 24V....
Should be the +I and Comm.... Please verify the voltage across this. it should be 24V. If yes...
The asterisk *2 on the DVP06XA-S wiring diagram means 'note 2', which says,"If input signal is...
The feedback from the transducer is current, 4-20mA in 24Vdc but in sink type. I already tested it...
The SMC ITV 2050-043BL4 is an I/P transducer. The digit '4' in the part number is for the...
So Let me get this straight. You have tested the valve with a 24 V signal varying the current...
Topic: Software, including programming, OS issues, etc.
from the Automation List department...
OPC Server for the ALSTOM 80MT PLC
Originally posted by Chetan Chothani on 12 January, 2000 - 2:33 pm
Does anybody know if an OPC Server exists for the ALSTOM 80MT PLC ??
New Replies:
does anybody can help me? I have case. I want to upgrade my operating system in my computer for...
Topic: Power generation equipment control.
from the Power Generation department...
Gas Turbine control - Hardware Part Trip of L4
Originally posted by Neo on 19 October, 2014 - 8:02 am
When Hardware causes the trip of L4
New Replies:
neo, Welcome back; I've been a little busy, also, so it hasn't been a problem. So, I'm taking...
Posted by JŁrgen Rose on 19 October, 2014 - 7:38 am
Power Plants on the Internet? Really? The latest research that generated the map is being presented at the 4SICS conference in Stockholm.
Topic: Engineering and workplace issues.
from the Instrumentation department...
Reinstallation of an Orifice Plate in a Pipeline.
Originally posted by Arafath Ali on 13 October, 2014 - 2:20 pm
How to reinstall an orifice plate in a pipeline after the information regarding the HP and LP side is lost?
New Replies:
Placing the beveled surface on the HP side definitely reduces the discharge coefficient and throws...
> LP is no angle, HP is angled. just remember where the medium is coming from. its the HP. I...
> Once the information regarding the HP and LP side of an orifice plate is lost, how to...
It is not real clear what is being asked. If it is regarding the direction that the orifice plate...
Topic: Power generation equipment control.
from the Forum department...
Speed of Synchronous Generator
Originally posted by Muhammad Salman on 26 February, 2010 - 4:08 pm
Why Speed of Synchronous Generator decrease with increasing speed?
New Replies:
Saudaslam... the situation you described is not that of a local generator connected to an...
Thank you CSA ...
Saudaslam, It seems I don't have the answer to your question. Perhaps another contributor to...
Saudaslam, Good, seemingly simple, question; extremely difficult to answer because it depends on...
thanks for reply, I need a little more clarification generator (275 MW at 18 kV working at...
If grid frquency decreased from 60 to 57 HZ what effect on generator active power increase or...
Topic: Engineering and workplace issues.
from the Forum department...
Orifice plate tapping -Flange or D, D/2
Originally posted by instruguy on 16 October, 2014 - 2:19 pm
Which type of orifice tapping - Flange or D, D/2 works best for larger pipes?
New Replies:
On rethink, you get higher d/p with flange taps than you do for pipe taps so the metering error...
d, I didn't ask the basic question. the reason is obvious. Sure of orifice plate as a basic...
No major advantage flange taps are the most common, but if the flanges get too costly, pipe...
Hi Do I get any advantage by using flange tap? Will accuracy has any effect? Thanks ...
It is all a function of service conditions, fluids, piping layout, and what you are trying to...
Topic: Power generation equipment control.
from the Protective Relaying department...
Transformer Differential Relay Protection during Open-Phase
Originally posted by Amrit Pandey on 17 October, 2014 - 4:55 pm
Transformer Differential Relay Protection during Open-Phase. Possibility of the relay to trip during line to ground fault or open conductor outside the zone of the differential scheme?
New Replies:
Amrit, please confirm the following conditions: 1) Grid-side winding (345kV) is wye-connected,...
Topic: Engineering and workplace issues.
from the Capacitors department...
Capacitor Fuse Blowing
Originally posted by charz on 18 October, 2014 - 2:35 am
What is the current flowing when one fuse blows in a three phase star connected capacitor bank?
New Replies:
Charz, Is the mid-point of the star-conected capacitors grounded/earthed? Regards, Phil...
Originally posted by vignesh on 12 October, 2014 - 5:34 am
How do I change my career from a gas turbine operator to a combined cycle operator?
New Replies:
Hi, Thanks Mr. George...
Topic: Power generation equipment control.
from the CONTROL emissions monitoring systems department...
Gas Turbine CEMS Operating Parameters
Originally posted by vignesh on 12 October, 2014 - 5:46 am
Operating parameters for monitoring gas emissions for gas turbine
New Replies:
Thanks to everyone....
Topic: Sensor technologies.
from the pressure setting department...
Calibration Pressure
Posted by tornatech on 18 October, 2014 - 2:36 am
i need to make setting to pressure in jockey pump controller
Topic: Communications systems and equipment.
from the Forum department...
SLC500 Communications with Unitronics PLC
Originally posted by Rodger on 17 October, 2014 - 1:38 am
Setting up communications between a Unitronics PLC and SLC 500 PLC
New Replies:
If there exist an option for interface between SLC500 and the new PLC with an Ethernet, it would be...
Topic: Human-Machine Interface and SCADA.
from the Forum department...
HMI w/ movable icons
Originally posted by Steven Smith on 15 October, 2014 - 2:15 pm
Looking for an HMI solution that allows users to drag icons.
New Replies:
It should be possible if you develop a program in a platform like Java/VB, interfacing it with the...
Original spec from customer is to have an interface that tracks position of rail cars on their...
This post can help you..I guess. http://www.control.com/thread/1396154961...
SCADAs can be an easy and cheap solution. Easily integrated to the existing system. Why use an...
Topic: Power generation equipment control.
from the Instrumentation and control department...
Steam Turbine MSV/GV Servo Valve
Originally posted by zouhen on 16 October, 2014 - 12:44 am
Turbine MSV Main stop valve and GV governing servo valve were damaged and lose functionality in the same period.
New Replies:
Thanks for the feedback!...
Thanks to all for the help. Yes that's correct, it was noted that Lube oil quality is very bad. ...
Lube oil quality, or, rather, the lack thereof, is usually the cause of most electro-hydraulic...
Would it be possible to have the manufacture of the servo, or a repair company perform a failure...
Topic: Power generation equipment control.
from the Forum department...
Changing SRV Valve setting
Originally posted by 8784597 on 16 October, 2014 - 4:28 pm
I need help to change the set point for SRV open position.
New Replies:
8784597, The SRV tries to control the pressure between the SRV and the GCV. To know if it's...
Topic: PLCs and related questions.
from the no communications plc department...
No Communication with GE Fanuc 90-30
Originally posted by angel rangel on 16 October, 2014 - 9:17 am
does anybody have ever had troubles with communications with GE PLC Fanuc 90-30?
New Replies:
Verify that you have the correct cable, if the cable has an RS-485 to RS-232 adapter built into the...
Topic: Motion control, servos, steppers, etc.
from the struggling here... department...
Rotary Die Cutter Help
Posted by Jeremy Ross on 16 October, 2014 - 2:25 pm
Looking for help on an application.
Topic: Software, including programming, OS issues, etc.
from the Forum department...
Maximun nodes of Modbus
Originally posted by Kevin Fan on 14 October, 2014 - 10:18 pm
What are the maximum nodes and cycle time of Modbus TCP and Modbus RTU on RS485?
New Replies:
By Patrick Lansdorf on 16 October, 2014 - 3:03 am -
Hi Kevin, I guess that for Modbus TCP there is no real limit of nodes. If the subnet mask...
Topic: PLCs and related questions.
from the little guidance please... department...
PLC Data Access Using OPC
Originally posted by Rodney Cox on 14 October, 2014 - 3:44 am
I need help finding resources to help me develop OPC data access to record data to my database. I'm an information systems student new to PLCs and cannot find the necessary resources.
New Replies:
We run the OSS project http://pvbrowser.org it includes an OPC XML-DA client based on libcsoap,...
Topic: Human-Machine Interface and SCADA.
from the Engineering department...
HMI Communication with SIEMENS PLC
Originally posted by Ali Shakarami on 2 October, 2014 - 10:23 pm
Sending the signal value from GE HMI(CIMPLICITY) to other controler over MODBUS RTU
New Replies:
By Patrick Lansdorf on 16 October, 2014 - 2:39 am -
Hi, You will need to check what type of Siemens PLC it is. If it is S7-1200 or S7-1500, you...
Topic: Power generation equipment control.
from the Instrumentation and control department...
How to Calibrate the Gas Turbine Vibration Sensors
Originally posted by Any on 13 October, 2014 - 6:29 am
How to calibrate the vibration sensors after removing them before major gas turbine overhaul
New Replies:
> The new word is VERFIFY. CuriousOne, You said a mouthful! ;-)...
An historical reply related to the older TSI instrumentation... One can "loop...
The new word in industry is not calibrate. The new word is VERFIFY....
Originally posted by connected on 14 September, 2014 - 2:31 pm
Problem with SCADA system that supervises electrical power flow for a residential building. Connected with Modbus RTU over RS485 daisy-chained 2-wire. The communication on the bus seems to be destroyed with Schneider PM750 connected.
New Replies:
Differences are common, if there is nothing to tie their references together. If one end or both is...
Thank you for posting your solution. It really helps who find this thread to see what the solution...
I finally found a solution to this problem. Based on the response here, I've measured the...
Topic: PLCs and related questions.
from the Forum department...
MSTR TCP/IP Control Word Definitions
Originally posted by Jon Pope on 16 April, 2009 - 4:20 pm
clear definition on some of the control words used in setting up the MSTR function with TCP/IP
New Replies:
Hi I came across this post tryign to find answer to an issue using the same configuration u...
Topic: Motion control, servos, steppers, etc.
from the Electrical & Systems department...
Over-speeding of Slave Motor in Rock Conveying System
Originally posted by Ravindra K Maheshwari on 28 September, 2014 - 6:16 am
Rock coveyor is being driven by Master and slave, two motors in load sharing mode. Slave motor is over-speeding when master gets higher loads.
New Replies:
Is there the possibility that despite the use of VFDs, the motors are locking up at full voltage? ...

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
If life is a stage, I want some better lighting.
Advertise here
Advertisement
our advertisers
Help keep our servers running...
Patronize our advertisers!
Visit our Post Archive