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Control.com member...
Member Information and Posts by David_2
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:
> Would a Modbus server with register greater than 16 bits be useable? No, It would be a...
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:
> LP is no angle, HP is angled. just remember where the medium is coming from. its the HP. I...
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:
The asterisk *2 on the DVP06XA-S wiring diagram means 'note 2', which says,"If input signal is...
The SMC ITV 2050-043BL4 is an I/P transducer. The digit '4' in the part number is for the...
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:
Thank you for posting your solution. It really helps who find this thread to see what the solution...
Topic: Engineering and workplace issues.
from the Forum department...
Measuring Principle of Field Instruments
Originally posted by ahamednivas on 10 October, 2014 - 5:58 am
Regarding the selection of Instruments and its measuring principle
New Replies:
Tony Kuphaldt's massive tome on instrumentation, "Lessons In Industrial Instrumentation,...
Topic: Sensor technologies.
from the Instrumentation department...
Load cell output mV linearity
Originally posted by Pradeep on 28 September, 2014 - 5:16 am
Whether load cell output in mV will linearly increment according to weight added to it?
New Replies:
Ideally, yes, but . . . . A load cell is ratiometric, that is, its output is proportional to the...
Topic: Communications systems and equipment.
from the Engineering design department...
RS485 Connnection to DV-6 VE4006P2
Originally posted by Bhaskar Mittal on 26 September, 2014 - 12:53 pm
Connecting DCS to VFDs on 485 Modbus RTU
New Replies:
Modbus is not plug-and-play even if Emerson's laughable marketing spiel, "Plug your Serial...
Topic: Continuous process industries, DCS questions.
from the Instrumentation department...
Thermocouple Temperature Drops Suddenly
Originally posted by Litto on 22 September, 2014 - 2:06 am
Unexplained temperature drop while process is running
New Replies:
If you get a high mV reading across the thermocouple wires, then - moving the wires to make the...
A drop to 100 is indicative of a short creating a false junction. A drop to zero is indicative...
Somewhere between the hot junction and the analog input there's a short circuit in the extension...
Topic: Engineering and workplace issues.
from the Forum department...
DCS analog input problem
Originally posted by mahmoud fawzy on 4 September, 2014 - 7:10 pm
DCS Analog input signals didn't work with ADAM card
New Replies:
Mr. Fawzy, That's a very interesting observation. A common for all channels is what allows...
Given the nature of what you've reported thus far, I can't predict what will happen if you connect...
The symptoms you're seeing are a classic example of exceeding the common mode limitation of the...
Classic ground loop symptoms When you connect a battery powered simulator, it's floating with...
Topic: PLCs and related questions.
from the Forum department...
Yokogawa DCS Analog Module AAI143
Originally posted by Ariel on 15 September, 2014 - 2:45 pm
Difference between analog mA value and their correspondent raw value.
New Replies:
Recently there was an unresolved thread involving the same model Yokogawa AI, here ...
Topic: Engineering and workplace issues.
from the Calibration department...
Rosemount 3051 Calibration
Originally posted by josh0206 on 22 June, 2014 - 3:39 pm
Rosemount 3051 Calibration
New Replies:
Yes. 12-117 in wc....
Topic: Sensor technologies.
from the Instrumentation department...
ABB Flowmeter -Flow Data Is Less
Originally posted by sandeep on 11 September, 2014 - 6:27 am
flow meter data is less compared to other flowmeters
New Replies:
> "flow meter data is less compared to other flowmeters" other flowmeters? ...
1) Is this a new installation or a new problem with an existing, previously satisfactory...
Topic: Sensor technologies.
from the instrument department...
Level Transmitter on Condensate Drum
Originally posted by rosemount on 10 September, 2014 - 2:20 pm
Erratic reading for level transmitter on condensate drum
New Replies:
There's nothing wrong with the transmitter, it's accurately reporting exactly what's happening -...
Topic: Continuous process industries, DCS questions.
from the Instrumentation and Control department...
Temperature Transmitter
Originally posted by Kamaraj on 8 September, 2014 - 7:11 am
How can we test a Temperature Transmitter Accuracy?
New Replies:
I presume the first simulation is Prova 123 K T/C output to temp transmitter. It isn't clear...
Topic: Sensor technologies.
from the Instrumentation Design department...
Using a Standpipe with DP Level Transmitter
Originally posted by TANWEER on 3 September, 2014 - 8:57 pm
Can we use a standpipe with a DP type level transmitter?
New Replies:
Stilling wells are inside the tank or vessel, so getting an impulse line to connect at the bottom...
Topic: Sensor technologies.
from the Instrumentation and Control department...
Level Transmitter for Submersible Pump
Originally posted by Anil Bathra on 3 September, 2014 - 9:50 am
Which level transmitter will be the best choice for measuring the level of a well of 400 m depth?
New Replies:
Any one that goes deep enough. The question is, how deep? GE Druck's PTX 1730 says it does up...
Topic: Local and wide area networking in factory automation.
from the Forum department...
TCP/IP over Ethernet
Originally posted by Tarun on 25 August, 2014 - 1:23 pm
Is TCP/IP on ethernet better?
New Replies:
> What does Ethernet port with web server mean? It means that the Ethernet port supports HTML...
Originally posted by RLovell on 29 August, 2014 - 1:08 pm
My high school students ask when/how/if abstract topics like polynomials, factoring, rational functions are ever actually used in the Real World. I don't know..maybe you do?
New Replies:
shortened URLs for the thermocouple polynomials above Thermocouple polynomials ...
Topic: Continuous process industries, DCS questions.
from the Instrumentation and Control department...
Calculating Pressure Transmitter Range
Originally posted by Kamaraj on 21 August, 2014 - 7:42 am
How can we test Rangeability of Pressure Transmitter?
New Replies:
The word 'Turndown' is used in two ways. One use of the word turndown is to define how far a...
The term in "FSO" in your spec means (percent) of full scale uncertainty. My selection...
A colleague informed me that an NaK transmitter is a pressure transmitter with a local fill fluid...
The definition you found is a correct definition of rangeability. I have no idea what a NaK...
Topic: Local and wide area networking in factory automation.
from the Forum department...
MODBUS to Lan Convertor
Originally posted by danaqu on 26 August, 2014 - 2:53 pm
Looking for a MODBUS to Lan convertor.
New Replies:
It might work. I didn't see any software for configuring it. That type of serial server is...
Topic: Continuous process industries, DCS questions.
from the Forum department...
Control Valve Position Command Signal
Originally posted by Gary on 11 August, 2014 - 2:28 pm
Looking for a device that generate control valve position signal for open loop control
New Replies:
I think Roy got it - manual station. I thought almost any PID controller had an auto/manual or...
Topic: Engineering and workplace issues.
from the Forum department...
Equation for Flow conversion in DCS
Originally posted by Aravazhi on 8 August, 2014 - 3:55 am
Need help calculating the DP flow in m3/hr. Have most of the equation.
New Replies:
When you say that 0-500 mbar = 0-20,000 Kg/hr, was that calculation done using the same medium...
Originally posted by Jeff Julian on 8 August, 2014 - 8:38 am
Is there a way of upgrading our HC900 C50 Version 1.0x to a higher version to take advantage of its features w/o changing the cpu?
New Replies:
1) HCD (Hybrid Control Designer) software is backwards compatible to V1.0 controller firmware, with...
Topic: Sensor technologies.
from the Voltage drop department...
Honeywell XNX voltage drop
Originally posted by Saurabh on 7 August, 2014 - 7:52 am
Honeywell XNX shows voltage drop after connecting the TX
New Replies:
Your power supply and wiring are not providing the minimum voltage to the XNX (a gas detector). ...
Topic: Application Questions and Problems
from the Engineering department...
Looking for mA to Ohm Converter
Originally posted by Abhi on 5 August, 2014 - 4:22 am
Looking for a device that can convert 4-20 mADC or 0-10 VDC to 1~5 KOhms.
New Replies:
I know of no commercial device that does what you describe. Beamex manufactures process...
Topic: Local and wide area networking in factory automation.
from the The Banging Head Against Wall Department department...
RS485 Issues - Modbus Temperature Controller to Ethernet
Originally posted by Plutonius on 1 August, 2014 - 9:08 pm
I am currently have a bit of an issue connecting to a Love 2600 temperature controller via RS485 full duplex with a Grid Connect NET485 Modbus RTU to TCP ethernet bridge.
New Replies:
Are both Love and the RTU side of the bridge 4 wire, full duplex? If one side is 2 wire half duplex...
Topic: Motion control, servos, steppers, etc.
from the Forum department...
Field-bus Actuator Recommendation
Originally posted by Carlos Loureiro on 14 July, 2014 - 10:07 am
Looking for recommendations for a Field-bus Actuator
New Replies:
You need a positioner with Fieldbus communications, not an actuator. The actuator does the...
Topic: Software, including programming, OS issues, etc.
from the Electrical & Instrumentation department...
Unable to load DTM of HART Field Transmitter
Originally posted by Hoa on 24 March, 2014 - 11:02 pm
The Preventive Maintenance Server can not access Rosemount HART protocol transmitters
New Replies:
Rosemount download site for DTMs for Rosemount instruments. http://tinyurl.com/qe6cfy8...
Topic: Continuous process industries, DCS questions.
from the Instrumentation department...
DP to Flow conversion
Originally posted by kamaraj on 4 July, 2014 - 6:13 am
can we directly configure square rooted DP (4 - 20mA) from DP transmitter to flow
New Replies:
> And the max range of orifice is 120 m3/hr if my DP is 20mA then is my flow equals to...
Every 3051 has a parameter to convert the output of configured DP range from a linear DP output to...
Originally posted by Joe on 29 June, 2014 - 7:10 am
Differential pressure as tank level incorrect reading
New Replies:
I haven't a clue what your supplier actually provided. You need to ask them to be very specific...
Presumably this is liquid CO2 in a pressurized vessel? You probably have the wrong DP pressure...
Topic: Communications systems and equipment.
from the Forum department...
RS-485 Communications
Originally posted by Bill Dolan on 24 June, 2014 - 1:47 pm
RS-485 Communications with Standing Waves
New Replies:
Agreed, Curt does give great explanations. Oscilloscope for RS-485 differential signals - need...
In a word, yes. For a graphic illustration of such, look here: http://tinyurl.com/o6mbtwm ...
Topic: Communications systems and equipment.
from the Forum department...
EGD Protocol?
Originally posted by RonG on 17 June, 2014 - 11:45 am
Looking for EGD protocol spec
New Replies:
90 page note on EGD protocol: http://tinyurl.com/ouhg4rs...
Originally posted by Tulus Lubis on 5 June, 2014 - 1:01 am
Standard installation for Gas Flow Measuring with Pressure and Temperature compensation.
New Replies:
I just thought locating the PT static pressure tap at the high side DP tap and keeping a thermowell...
Topic: Continuous process industries, DCS questions.
from the Maintenance department...
Endress+Hauser Level Transmitter Hunting
Originally posted by Talluri on 21 May, 2014 - 2:59 am
What is the possible cause for Level transmitter hunting?
New Replies:
Most all modern level instruments can be configured to indicate a high or a low level (or sometimes...
Topic: Engineering and workplace issues.
from the Forum department...
Control Valve Positioner
Originally posted by Gagandeep Singh on 10 June, 2014 - 5:51 am
Inlet air pressure of smart positioner is varying
New Replies:
The Azbil SVP3000 'smart' positioner is a HART 4-20mA current pneumatic valve positioner. The...
The inlet air is has a mechanical pressure regulator somewhere upstream. The changes in pressure...
Posted by David on 5 June, 2014 - 10:41 pm
ASCII, RTU, TCP, now ABB?
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