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Control.com member...
Member Information and Posts by David_2
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...
1) What is an example of a 'good reading', for example, 215 Deg C? 2) What is an example of a...
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%,...
Topic: Motion control, servos, steppers, etc.
from the Forum department...
Beginner question: starting an Altivar 12
Originally posted by Jaap P on 29 March, 2014 - 3:23 am
I'm trying to get an Altivar 12 running through modbus without succes. Any help greatly appreciated!
New Replies:
I'm hex illiterate. What's the URL for the device's modbus manual with a map?...
Originally posted by Mohid on 27 March, 2014 - 6:16 am
Trying to receive process parameters from an APB PLC to Honeywell DCS over modbus
New Replies:
DCS documentation is available only to the privileged few, which doesn't include me, so I can only...
Topic: Sensor technologies.
from the Very Low Pressure department...
Panel Pressure Transmitter
Originally posted by Paul Ganter on 17 March, 2014 - 2:37 am
I need to measure a very low pressure, not a DP.
New Replies:
You can't have your cake and eat it, too. > the internal pressure of the panel to ensure...
Topic: Software, including programming, OS issues, etc.
from the Forum department...
Final year project using Honeywell DCS
Originally posted by AbhilashKondodi on 26 March, 2014 - 11:42 am
Is there any inbuilt SCADA Software for Honeywell DCS HC900 C30?
New Replies:
Current firmware 4.4 (or higher) HC900 controllers can use flash memory in the controller's CPU for...
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:
> all the field transmitters are losing the DTM Wrong. The field transmitters can function...
Topic: PLCs and related questions.
from the Automation List department...
So What did I use the Clicks for?
Originally posted by Curt Wuollet on 22 March, 2014 - 8:37 pm
Real world example of using the Koyo Click PLC
New Replies:
Super Review. Thank you. Is the $99 model with the 485 port a Modbus slave only, or can it be...
Topic: Sensor technologies.
from the Instrumentation department...
I/P issue
Originally posted by Syed Misba on 21 March, 2014 - 10:56 am
4-20 mA & rosemount I/P transducer causing problems
New Replies:
Thank you for providing the resolution to the forum....
Topic: Communications systems and equipment.
from the Forum department...
Modbus Register Set
Originally posted by JAspinall on 16 March, 2014 - 10:31 am
Is anyone able to point me in the right direction as per configuring this register set based on my Modbus list?
New Replies:
One of two situations is likely - word order mixup or mixing words from different values. ...
Topic: Continuous process industries, DCS questions.
from the Forum department...
Using an MTL 7706+ Barrier eith HART
Originally posted by Allan Doc on 14 March, 2014 - 1:42 pm
MTL 7706+ barrier suitable with HART?
New Replies:
Your co-workers and colleagues are the people who can tell you whether it works or not. It...
Topic: Continuous process industries, DCS questions.
from the PLE department...
Boiler Combustion Air Flow
Originally posted by Abu Raihan on 14 March, 2014 - 7:51 am
Best practices for Boiler combustion Air flow measurement in DCS or PLC.
New Replies:
A reason for doing square root in the DP transmitter is that it is functionally a flow transmitter....
Topic: Continuous process industries, DCS questions.
from the instrumentation and control engg department...
Proportional control
Originally posted by saarathi on 5 March, 2014 - 4:18 am
why the response of proportional control is exponential?
New Replies:
I didn't understand the question either. Maybe a damped approach to setpoint with no overshoot...
Topic: Engineering and workplace issues.
from the Instrumentation department...
Pressure transmitter
Originally posted by Aster Guillermo on 11 March, 2014 - 4:53 pm
What will happen when connecting the 4-20 mA output of one transmitter parallel to other transmitters slot of PLC?
New Replies:
> is it possible to connect a transmitter output to another transmitter? No. > if we...
Originally posted by instrumentation on 28 February, 2014 - 11:10 am
Using SCADA communications with a UT 35A controller
New Replies:
The 3rd digit in the model number defines which comm protocol/transport layer your 35A has. none,...
Topic: Sensor technologies.
from the Forum department...
level control in grain silo
Originally posted by Old digger on 27 February, 2014 - 10:10 am
What do you use to monitor the level of grain in a silo?
New Replies:
The Siemens LR560 radar was made for grain silos. Its start-up wizard even asks whether the...
Topic: Continuous process industries, DCS questions.
from the Forum department...
Actuators requiring 50 mA current
Originally posted by Jimmy Mascrehnas on 23 February, 2014 - 6:48 pm
How do actuators requiring 50mA current work?
New Replies:
2 wire, loop powered, 4-20mA field transmitters use approximately 3.5-3.6mA to run the device's...
I think you've answered your own question; whatever device is using a 50mA control signal needs...
Originally posted by fabio on 25 February, 2014 - 9:44 am
Using an Explosion proof loop in a NEMA4x Junction box
New Replies:
No, not in the hazardous area....
Topic: PLCs and related questions.
from the Shiplift department...
Malfunction of Analog Input Module
Originally posted by Siemens on 22 February, 2014 - 2:03 am
Problem related to Siemens analog input module
New Replies:
What kind of load cell do you have that outputs a milliamp signal? Most load cells have a...
Topic: Engineering and workplace issues.
from the Forum department...
Signal conditioner
Originally posted by Bill Schwarz on 13 February, 2014 - 10:02 am
200 mA input signal conditioner?
New Replies:
The API 4300 G spec sheet says it has an input range up to 900mAdc and a selection of conventional...
Topic: Software, including programming, OS issues, etc.
from the R&D department...
Help with MODBUS Address
Originally posted by gil on 2 February, 2014 - 7:26 am
Help needed with writing a bit (true/false) to a modbus adress
New Replies:
The inverter/drive is a Modbus slave. You need a Modbus master to initiate a write command to...
Topic: Software, including programming, OS issues, etc.
from the Forum department...
MODBUS memory-map requirements
Originally posted by mbusland on 29 January, 2014 - 3:45 pm
Minimum requirements for memory-map.
New Replies:
Do you have some means of configuring the slave address? DIP switch? One thing that's missing...
Topic: Software, including programming, OS issues, etc.
from the Communications department...
How do OPC works?
Originally posted by Daniel on 23 January, 2014 - 9:09 am
How do OPC works and what are the differences with other protocols?
New Replies:
In OPC, the OPC server has the low-level driver that talks the comm protocol of the field device. ...
Topic: Sensor technologies.
from the Measurement department...
Measuring pressure & temperature in circular pipes
Originally posted by Smithy on 20 January, 2014 - 9:07 am
How do I calculate straight length requirements for pressure & temperature measurements in a pipe?
New Replies:
I knew I'd seen a reference to a pressure tap location spec somewhere but it took a day to recall...
For temperature, you get the temperature for point in the flow profile the tip of the thermowell...
Originally posted by jon fukuki on 11 January, 2014 - 10:38 am
Forced balance temperature transmitter calibration
New Replies:
If it's a true force balance transmitter, the style with the diaphragms stacked on "top' of...
Originally posted by any on 5 January, 2014 - 7:51 am
Illegal response message from Modbus from atlas copco MKIV gateway which is CAN to rs485 wired to rs232 converter to a pc.
New Replies:
I've heard that JBus is a minor derivative of Modbus, but I had never heard that the CAN protocol...
Topic: Local and wide area networking in factory automation.
from the Forum department...
default slave id configuration
Originally posted by mbusland on 28 December, 2013 - 12:36 pm
How to setup the default slave-id when shipping device to customers.
New Replies:
Anyone who implements Modbus (or any protocol) routinely expects to configure a slave address on...
Originally posted by Manas on 28 December, 2013 - 10:36 pm
Is it possible to connect j type thermocouple with k type extension wire up to transmitter?
New Replies:
The bad data from mixing wire types makes me shudder. You can't dig up some J wire to do it right...
Topic: Software, including programming, OS issues, etc.
from the software department...
modbus floating point format
Originally posted by mbusland on 21 December, 2013 - 9:34 pm
Is it mandatory to use IEEE Format for representing floating point in 2 16bit registers?
New Replies:
I love Banner Engineering's documentation because they explicitly provide the format and then give...
Originally posted by Ranjith on 22 December, 2013 - 2:37 am
Using Multicore cable for 4-20ma signal from Transducer to Scada Interface panel.
New Replies:
Why not? According to my chart, 1 mm2 is a size somewhere between 18 and 16 AWG. That's more...
Topic: Engineering and workplace issues.
from the Instrument department...
Redundant Server vs Dual Redundant Server
Originally posted by Utz on 18 October, 2011 - 1:25 am
is there any difference between the two things in the subject?
New Replies:
If Rosemount can, why not you, too? pg 13, 3144P manual: Hot Backup® provides temperature...
Originally posted by Sakthi venkatesh on 21 December, 2013 - 6:15 am
How to calibrate and communicate HART transmitter along with 475 communicator using DRUCK DPI 610 24 voltage power source?
New Replies:
We must have found different manuals on the web. The manual I found for the Druck DPI 610 (User...
Topic: Sensor technologies.
from the Instrumentation department...
Differential Pressure Teasing Question
Originally posted by SB on 11 December, 2013 - 1:13 am
For the trapped flow through the orifice, will any differential pressure be created?
New Replies:
No, the DP across an orifice plate will diminish as the static pressure equilibrate in its closed...
Topic: Continuous process industries, DCS questions.
from the Process Control department...
Watlow F4 not being detected
Originally posted by Paul on 29 November, 2013 - 9:39 am
Watlow F4D will communicate with one computer but is not detected on another.
New Replies:
> There's no option with the card to turn off the flow control, Isn't flow control done in...
Topic: Local and wide area networking in factory automation.
from the Forum department...
HART communication
Originally posted by P. Mahesh on 25 November, 2013 - 5:04 am
HART multidrop limitation
New Replies:
The limitation is a HART 5 limitation, according to the HART Foundation's HART Communication...
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