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Control.com member...
Member Information and Posts by David_2
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...
Thermowells are downstream of the orifice beyond the meter run length. Before multivariables...
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...
No one here can see your installation. We only know what you tell us, which thus far, is...
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?
Topic: Continuous process industries, DCS questions.
from the INSTRUMENTATION department...
Differential Pressure Transmitter Calibration
Originally posted by RAMESH on 31 May, 2014 - 5:43 am
Changing the range of Differential Pressure Transmitter Calibration.
New Replies:
Tables A-1 and A-2 on pages 118-119 of the 3051 manual shows the LRL and URL range 'limits' (not...
Topic: Communications systems and equipment.
from the modbus rtu department...
rs 485 deep sea 7320
Originally posted by luis carlos sandoval on 30 May, 2014 - 8:22 pm
modbus rtu slave rs485
New Replies:
whoops, it's late. Correction to my previous post: 0406h is 1030 decimal. The one offset...
The DSE-7300 operator manual shows setting the Modbus slave address and the baud rate on page 70...
Topic: Software, including programming, OS issues, etc.
from the Forum department...
Instrument Tech Training Topics
Originally posted by GBrown on 29 May, 2014 - 4:50 pm
My boss has asked me to create a training program from the instrument techs that is one 3 hour course a month for 2 years.
New Replies:
Providing a list of suggested topics to your intended audience is a great technique to spur a...
Topic: Communications systems and equipment.
from the Forum department...
EDDL files stored in/on device?
Originally posted by Paul Tinetti on 29 May, 2014 - 4:48 pm
Why haven't manufacturers figured out a way to store EDDL files in on-board memory of devices?
New Replies:
Isn't the EDDL the 1-2Mb file, a DTM or DD file, that defines the objects in a specific model that...
Topic: Computers in manufacturing; also hardware discussion.
from the Forum department...
Foundation Fieldbus - Linearization Type
Originally posted by Derrick on 25 May, 2014 - 9:17 pm
Foundation Fieldbus Linearization Type
New Replies:
No, when the transducer's direct range (-1 to 2 bar) differs from the reported range (-1 to 1 bar),...
Borrowed from Anderson Instrument's FF transmitter manual (my comments in parentheses) Direct:...
Topic: Sensor technologies.
from the Forum department...
Vortex Flow Meter
Originally posted by Prasana on 14 May, 2014 - 4:29 pm
Troubleshooting Vortex Flow Transmitter
New Replies:
Inlet pressure to the valve changes. With the controller in manual mode holding the valve at a...
Topic: Continuous process industries, DCS questions.
from the Forum department...
pulse scale factor
Originally posted by Hoo on 8 May, 2014 - 3:41 am
pulse scale factor
New Replies:
It appears that the repeatability of a given coriolis flow meter increased from 0.05140% to...
Topic: Continuous process industries, DCS questions.
from the Automation List department...
Electromagnetic flow meter problems
Originally posted by karthick on 12 May, 2014 - 3:47 am
Totalizer reading on electromagnetic flow meter of chemtrols errors.
New Replies:
Most, if not all, flow meters have a setting called something like "Low flow cutoff". ...
Topic: Sensor technologies.
from the Forum department...
Measuring Flow with Annubar
Originally posted by hknclk on 11 May, 2014 - 9:36 am
Should pipeline be full of water for measuring flow with annubar?
New Replies:
To get a flow reading that is meaningful, the pipe needs to be full of liquid. The requirement...
Topic: Local and wide area networking in factory automation.
from the AKH department...
4-20 ma HART Transmitter
Originally posted by gct on 7 May, 2014 - 4:10 pm
HART transmitter showing only 4 ma or 3.9 ma but it should show 12 ma as per process variable indicated in HART communicator.
New Replies:
Without knowing what the function of terminals 1, 2, 3 and 4 are, it's not possible to determine...
Topic: Engineering and workplace issues.
from the Thermocouple department...
Thermocouple extension wire resistance
Originally posted by Farzin on 7 May, 2014 - 10:39 am
Thermocouple extension wire resistance
New Replies:
Not surprising, different alloys have different resistances. There are tables with resistance...
Topic: PLCs and related questions.
from the Forum department...
Multiple Controllers on one RTD
Originally posted by FredS on 7 May, 2014 - 8:19 am
How can I use the same RTD for more than one controller?
New Replies:
See the blog on this topic at the link below: http://tinyurl.com/mtaqm6f > Can I connect a...
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 the code...
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:
Another control.com thread http://control.com/thread/1336501913 involved back calculating when...
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:
Your bubbler can not 'see' any head pressure lower than its elevation, so you can not measure any...
Topic: Communications systems and equipment.
from the Forum department...
Modbus via microcontroller
Originally posted by Ed on 20 April, 2014 - 2:40 am
Communicating with device via Modbus RTU through a microcontroller.
New Replies:
If it were me, I'd connect a PC with a serial port running a generic Windows Modbus 'test' master,...
Topic: Continuous process industries, DCS questions.
from the instrumentation department...
I/P positioner and I/p transducer Control valve
Originally posted by Emerson process management on 13 May, 2012 - 4:18 am
Difference between I/P positioner and I/p transducer
New Replies:
Look at the principle of operation and internal diagrams of a Bellofram Type 1000 I/P. It does not...
Topic: Communications systems and equipment.
from the Instrumentation and Control department...
Communication between Speedac NXT weighing Controller and Honeywell Scada
Originally posted by RKM on 17 April, 2014 - 3:15 pm
Speedac NXT controller is not communicating with Honeywell Server via RS 485 serial communication.
New Replies:
Was the former device communicating properly right up until it was replaced or is the replacement...
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:
Mr. Linse, What's a rule-of-thumb value for RTU-TCP latency in a Digi Modbus bridge product? ...
You know - the word size, 11 bits - the number of words in the master message - silent...
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...
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: 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:
> 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...
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: Communications systems and equipment.
from the Automation List department...
Communication of UDC3000 controller with Experion
Originally posted by Sachin on 5 April, 2008 - 1:27 am
I have connected the UDC3000 controller with Honeywell Experion SCADA via RS485. I don't have a deep idea about UDC3000 controller.
New Replies:
Latest edition of Honeywell's Modbus RTU communications manual 51-22-25-66, Rev T, dated February...
Originally posted by andyt76 on 24 July, 2012 - 7:19 am
Connecting a Honeywell UDC temperature controller to Modicon PLC via Modbus. any ideas on this?
New Replies:
Latest edition of Honeywell's Modbus RTU communications manual 51-22-25-66, Rev T, dated February...
Topic: Continuous process industries, DCS questions.
from the HC900-C70R department...
Split Range Control on two valves - HC900-C70R
Originally posted by Frederik on 8 April, 2014 - 7:45 am
Split Range Control on two valves - HC900-C70R
New Replies:
The pressure transmitter is the input to an analog input function block. Its analog value is the...
Topic: Software, including programming, OS issues, etc.
from the Forum department...
Problem in Modbus Master Simulation Tools
Originally posted by Rupak Shrestha on 4 April, 2014 - 4:26 am
I'm having problem to communicate over Modbus RTU and TCP/IP frame with my computer using free softwares such as Simply Modbus Master 7.1 and TCP Client 7.1, and Modbus Poll.
New Replies:
It sounds like you just don't have a connection. RS-485 has some issues. The A/B or (+)/(-)...
Topic: Engineering and workplace issues.
from the instrumentation department...
Loop calibration for 2 wire loops
Originally posted by - on 3 April, 2014 - 3:02 am
Loop Calibration for 2 wire loops from calibrator that gives 24VDC loop output power
New Replies:
Can you do a loop calibration? Probably. But you're on your own figuring it out. Kusam...
Topic: Sensor technologies.
from the Instrument department...
ABB Thermocouple Transmitter reading fluctuates
Originally posted by msalem73 on 29 March, 2014 - 6:42 am
Transmitters reading Fluctuating
New Replies:
6 different T/C transmitters with a 4 year history of proper operation which now fail-low...
Topic: PLCs and related questions.
from the Forum department...
Tri-Sen analog output low
Originally posted by JoeFin on 31 March, 2014 - 6:12 pm
Tri-sen TS 310 controller that doesn't want to output a full 20 ma signal
New Replies:
Page 40 of the TS310 User Guide states that the voltage driving the output is 7 volts and that an...
Topic: Sensor technologies.
from the Instrumentation & Control department...
Liquid gas level measurement
Originally posted by Engineer92 on 27 March, 2014 - 2:52 am
Liquid Gas Level measurement
New Replies:
> But we noticed that when tank level is 15%, pressure is around 5 bar & when level is 50%,...
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