Posts from...
Today, Wednesday, April 16, 2014
Topic: Continuous process industries, DCS questions.
from the Forum department...
Instrumentation cables sizing
Originally posted by Ahmed Sami on 10 April, 2014 - 7:57 am
Instrumentation cables sizing
New Replies:
Dear Ahmed Sami, Your question is incomplete I can say. Cable cross section and hazardous area...
Ahmed Sami, Choosing wire/cable for a particular application is a very involved process. Does...
Why do you sugget 1.5 mm2 cable? Does that follow any standards recommendation or calculations? ...
You Need at least 6x1.5mm (6 core cable)...
please note that for all your instrument devices you can use 3x1.5sqmm (3 core cable)....
Topic: Communications systems and equipment.
from the Communications department...
OPC server communicate with OPC server
Posted by Franco Kew on 16 April, 2014 - 5:19 am
How do one OPC server share data with another OPC server?
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:
do you have a static IP address for PLCs? Alex. Contact me. Skype: skype_redfox...
Topic: Software, including programming, OS issues, etc.
from the Computer department...
Serial Communication VB Code
Posted by Jinali on 16 April, 2014 - 4:11 am
Continuous reading of serial input
Topic: Human-Machine Interface and SCADA.
from the Forum department...
Vijeo Citect ModBus RTU Write Problem
Originally posted by Rui Monteiro on 21 December, 2011 - 2:19 pm
Vijeo Citect ModBus RTU Write Problem
New Replies:
> Anyone got the solution? try without tagwrite tagname = ArgValue1...
Hello, I have the same problem. > I'm facing a problem in sending data to a Modbus RTU...
Topic: Communications systems and equipment.
from the Automation and EMS department...
Modbus Data transmission time
Originally posted by Bhadresh Sarvaiya on 12 April, 2014 - 7:58 am
How to calculate time to receive data from slave to master in daisy chain connection of slaves, if my slaves are 20 and single master.
New Replies:
By Patrick Lansdorf on 16 April, 2014 - 1:55 am -
Hi, I have made a simple Excel sheet, where one can calculate the line time. You will need to...
Slick idea on the prefetch! ...
By Lynn August Linse on 15 April, 2014 - 9:31 am -
>> What's a rule-of-thumb value for >> RTU-TCP latency in a Digi Modbus bridge...
By Bhadresh Sarvaiya on 15 April, 2014 - 1:29 am -
> Mr. Linse, > What's a rule-of-thumb value for RTU-TCP latency in a Digi Modbus bridge...
Mr. Linse, What's a rule-of-thumb value for RTU-TCP latency in a Digi Modbus bridge product? ...
By Lynn August Linse on 14 April, 2014 - 10:36 am -
Just be careful to accommodate the delay-back off during failure. With a single device, it might...
It depends on how it's written. In the system I just set up, I use a state machine to do the...
By Bhadresh Sarvaiya on 13 April, 2014 - 5:14 am -
Thank you for your kind reply.. but i didn't get answer as i want.. i didn't understand your...
You know - the word size, 11 bits - the number of words in the master message - silent...
Topic: Communications systems and equipment.
from the Forum department...
SCADA RTU in Substation
Posted by SSU on 16 April, 2014 - 12:56 am
Why use SCADA RTU in a substation? What is the purpose of SCADA RTU?
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? We use a DP transmitter for our prill tower air ducts....
Topic: Human-Machine Interface and SCADA.
from the Which HMI do you simply Love or Hate? department...
TOP 10 list of Best and Worst HMI & SCADA
Originally posted by Luciano Dell'Orfano - RTS Argentina on 12 October, 2002 - 9:35 am
I know everyone has their personal preferences, but I think it would be more interesting to discover which software is the Best or worst...
New Replies:
By Devin Montcrief on 15 April, 2014 - 12:28 pm -
> WinTr is advanced SCADA SOFTWARE for monitoring and saving data of manufacturing processes...
Topic: Engineering and workplace issues.
from the Level Control department...
Magnetorestrictive Level Transmitter issues
Originally posted by Braindead on 26 March, 2013 - 11:46 pm
Extreme vibration and loss of signal on level transmitters
New Replies:
Hi Mateus, there is only one instrument when you are working offshore on a FPSO or Platform...
Topic: Motion control, servos, steppers, etc.
from the Power Electronic Engineering department...
Medium Voltage Drive Variable Frequency Drive
Posted by Mahesh Thapaliya on 15 April, 2014 - 2:26 am
Application of Medium Voltage Drive in industry to save energy, obtained desired output
Topic: Local and wide area networking in factory automation.
from the I'm in trouble department...
MODBUS ABB ACS550 Connection trouble
Originally posted by Christopher James Churchill on 13 April, 2014 - 7:59 am
MODBUS connection trouble... How to create a virtual COMM port
New Replies:
Looks like USB conversion would be your best alternative. Here's a device from a company that...
The port behind the keypad, although RJ45, is serial, not Ethernet, so even if you could find a...
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:
thank you so much sir but unfortunately i couldn't find variables CEE1.HOUR...... i have many...
Topic: Sensor technologies.
from the Thermocouple department...
Thermocouple cable configuration
Originally posted by Shrk on 4 April, 2014 - 7:28 am
Choosing thermocouple cable configuration- twisted pair or coaxial (multi cored)
New Replies:
please note that T/C TYPE N lower cost compensated can be used depends up on your critical...
It is seldom ever a good idea to run un-twisted pair thermocouple extension wire. Thermocouple...
Shrk, www.omega.com is a very good resource for all kinds of sensors, particularly RTDs and...
Hi. Thanks. tried looking, did not get much info. Will certainly try again. Again, thanks...
Topic: Power generation equipment control.
from the Forum department...
Windmill Alternator
Originally posted by Karsten Rasmussen on 11 April, 2014 - 3:04 pm
Control of windmill alternator load
New Replies:
Karsten Rasmussen... following are two ways to change speed: o control blade-pitch. o control...
Karsten Rasmussen, I think it's going to be pretty difficult to control the speed of a wind mill...
Topic: Communications systems and equipment.
from the Forum department...
8-bit data types in Modbus registers
Originally posted by Jay on 10 April, 2014 - 5:26 am
Are 8-bit data types obsolete for Modbus?
New Replies:
By Lynn August Linse on 14 April, 2014 - 10:39 am -
A bit of historical trivia... Modbus never had 8-bit data types. The original PLC were made back in...
> Since registers are always 16 bits, does it even make sense to provide data types of 8 bits...
Topic: Continuous process industries, DCS questions.
from the Forum department...
Actuator indication and control
Originally posted by David Sutcliffe on 11 April, 2014 - 10:32 am
How to obtain indication and control from a Rotork actuator
New Replies:
Other types of actuators use two drive signals: - one signal drives the actuator 'open' - the...
please provide actuator model number and application...
Topic: Power generation equipment control.
from the Engineering department...
Siemens marshaling wire
Posted by Raymond Mpofu on 14 April, 2014 - 8:16 am
Brand name of Siemens' 0.5mm thick marshaling wire
Originally posted by Mik on 16 September, 2009 - 6:34 am
Turbo-generator response to changes in the power grid frequency.
New Replies:
Dear All, I am working on Hitachi Gas Turbines and Shin Nippon Steam turbines. There are three...
Topic: Software, including programming, OS issues, etc.
from the Tag Prefix WinCC V7.2 department...
Tag Prefix WinCC V7.2
Posted by / on 14 April, 2014 - 1:14 am
Communicating with Tag Prefix WinCC V7.2 using MODBUS TCP/IP protocol.
Topic: Power generation equipment control.
from the ABB Advant department...
ABB OS500 upgrade
Originally posted by Will P. on 5 March, 2014 - 5:46 pm
ABB OS500 upgrade to newer version HP B2600
New Replies:
Thanks All for your replies....
Originally posted by Neo on 11 April, 2014 - 10:08 am
Increase in reactive power drawl at generation source.
New Replies:
Neo, I have read and re-read this post several times the past couple of days--mostly hoping...
Topic: Software, including programming, OS issues, etc.
from the Annoying Exceptions department...
Negative Acknowledge and Bad Karma
Originally posted by Julie in Austin on 18 February, 2012 - 2:05 pm
How do you feel about security exceptions not being, you know, informative?
New Replies:
> What product are you working on, and are there any other security enhancements you are making?...
> Wait....when Digi hires you, you'll STOP writing code?? Digi -- don't hire Julie! No, Digi...
Topic: Communications systems and equipment.
from the Automation department...
DCS Yokogawa Communication Issue
Posted by Zarar on 13 April, 2014 - 2:21 pm
Yokogawa DCS communication with Modbus slave device using ethernet redundant connection with ALE111.
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:
Brian, When did this problem start? After a servo-valve was replaced? This is not a simple...
Topic: Human-Machine Interface and SCADA.
from the Forum department...
Connecting Floboss 107 to DeltaV
Originally posted by John on 11 April, 2014 - 5:13 pm
Student with a project to connect a Floboss 107 to DeltaV for an HMI.
New Replies:
An analog output can't very well handle a totalizer value because of the lack of dynamic range on a...
Topic: Continuous process industries, DCS questions.
from the Forum department...
Condensate pots and flow measurement
Originally posted by Karthik on 12 April, 2014 - 3:36 am
Using condensate pots for flow measurements
New Replies:
1. The purpose of condensate pots in steam flow measurement is to isolate or seal the transmitter...
Topic: PLCs and related questions.
from the Automation List department...
Interfacing VFD with PLC
Originally posted by Anonymous on 29 May, 2007 - 9:09 pm
How to interface variable frequency drives with PLCs?
New Replies:
If You Want only on/off control from PLC, then connect the drive to digital output module. and if...
Topic: Power generation equipment control.
from the control systems department...
Meaning of the "smiley symbol" in MARK V csp file
Originally posted by mhkhan on 11 April, 2014 - 10:58 am
In the csp file of MARK V control system, can any body tell me what the "smiley symbol" means in the BBL logics?
New Replies:
mhkhan, It's presumed you're referring SPECIFICALLY to the CSP.PRN file. It means EXACTLY...
Topic: Power generation equipment control.
from the Controls department...
Mark-VI Control System T-core Issue
Originally posted by srh on 10 April, 2014 - 6:49 am
Issue being faced on T-core of Mark-VI
New Replies:
Yes, technically T-controller is down. As regards time, PC is running on localized clock and...

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