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Communications
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: 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: 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: 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: 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: Software, including programming, OS issues, etc.
from the TPS SI Commincated by modbus department...
Modbus problem with honeywell TPS
Posted by govoni on 11 April, 2014 - 2:35 am
Decompressing Modbus word and still receiving appropriate feedback information
Originally posted by V K GUPTA on 9 April, 2014 - 12:34 pm
Communication between SIEMENS S7-400 PLC Scalance card to Yokogawa DCS CENTUM CS3000R3
New Replies:
you need to use Siemens CS-3000 module to convert your signal to modbus TCP/IP signal and interface...
By Patrick Lansdorf on 10 April, 2014 - 2:17 am -
Hi, I am guessing that the PLC is a Profibus master... You can use a gateway, such as: ...
Originally posted by Fuzzy Logic on 6 April, 2014 - 7:17 am
Are sites moving past communication standards originated by serial communications?
New Replies:
You all have been extremely helpful, thank you!...
Thanks, Lynn! I'll be sure to take a look at those. Understand about the mesh, but so far the...
By Lynn August Linse on 9 April, 2014 - 9:58 am -
> Lynn, if I read your post correctly, you're saying there are standalone RS485 radios, not...
> This may be crazy talk, but are there sites that implement wireless Ethernet/Modbus? I'm...
By Lynn August Linse on 8 April, 2014 - 9:55 am -
>This may be crazy talk, but are there >sites that implement wireless Ethernet/Modbus? ...
This may be crazy talk, but are there sites that implement wireless Ethernet/Modbus? I understand...
I agree, another reason that RS485 will be around is there is an enormous installed base of RS485,...
By Lynn August Linse on 7 April, 2014 - 10:23 am -
Actually, if I view this as the more narrow question of serial-vs-Ethernet, I could paraphrase a...
By Lynn August Linse on 7 April, 2014 - 9:37 am -
Adding to what Curt mentioned, I think the bulk of small companies find Modbus support FAR MORE...
By Ken Emmons Jr. on 7 April, 2014 - 8:16 am -
Many instrument and control device manufacturers (drives, panel meters, laser micrometers, etc)...
I have seem Modbus/TCP far more than Modbus serial in recent years.  Modbus/TCP and A-B Ethernet/IP...
You don't have to look very hard, many vendors can do Modbus/TCP. Often you have to ask as they...
Topic: PLCs and related questions.
from the Instruments Department department...
Modbus Max. Length
Originally posted by Franco Kew on 8 April, 2014 - 10:34 pm
Measure the total Modbus Length
New Replies:
Hadn't thought of segmenting the network with repeaters to fix the topology - slick! Franco,...
By Lynn August Linse on 9 April, 2014 - 9:46 am -
This is an RS-485 issue, not Modbus question. Max length is more an issue of the cable quality...
You're not supposed to run RS485 in a star topology. Not sure if short branches are officially...
Topic: Communications systems and equipment.
from the Forum department...
WinConX driver (MBX driver 4.2)
Originally posted by Julio Mtz on 8 April, 2014 - 9:46 am
I need the WinConX driver (MBX driver 4.2) to install an old PCI-85 card
New Replies:
Contact your local Schneider Modicon representative. They might be able to give you a complimentary...
Topic: Power generation equipment control.
from the Control&Automation department...
Preselected mode for Mark V
Originally posted by Abbernardo on 3 April, 2014 - 4:49 pm
PreSelected mode when connected to grid and Mark V trip
New Replies:
Abbernardo and CSA, I would like to make a comment just to make sure I am understanding the...
As usual CSA well explained the basics. Thank you take care G.Rajesh...
Abbernardo. The work om the transmission system should not affect the load on the unit--unless...
I appreciate the quick turnaround and help others! I was hoping it was you that answered the...
Topic: Communications systems and equipment.
from the ICCP Objects department...
MODBUS and ICCP integration
Originally posted by Krishna on 6 April, 2014 - 8:33 pm
How to integrate ICCP and MODBUS?
New Replies:
There are several solutions available that will interface between these 2 protocols. Kalkitech and...
Topic: Communications systems and equipment.
from the Instrument department...
Modbus Master/Slave on fiber optics
Originally posted by self on 7 April, 2014 - 12:31 am
Problem with modbus comunication
New Replies:
Have you tried removing the devices one at a time and see when the problem goes away? Can you tell...
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