Posts from...
Today, Thursday, April 24, 2014
Topic: Local and wide area networking in factory automation.
from the Forum department...
Modbus Converters
Originally posted by dodgeybro on 23 April, 2014 - 6:33 am
Modbus Gateway v's Modbus Servers and Protocol converters.
New Replies:
I like to think of a Gateway as device which converts one protocol to another protocol. Because in...
By Lynn August Linse on 24 April, 2014 - 11:09 am -
First warning ... one vendor's "Modbus Gateway" is anothers "Modbus Converter"....
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...
Hi, the numbering is introduced in the official Modbus Application Protocol Specification (page...
Guys who live in cubes write the code. Hence, it depends on whether the guy who wrote the code...
This goes back to the early days of Modbus when it was strictly used for Modicon PLC's where Coil...
Originally posted by Rzr on 24 August, 2012 - 7:11 am
Is there need for accessories like modules or adapters to connect the Magelis XBTGT6330 HMI to Modbus Plus network or it can be connected directly to the Modbus Plus network without using extra hardware?
New Replies:
Do you know what driver was used for Vijeo Designer for the Magelis to work with the Anybus-gateway...
Topic: PLCs and related questions.
from the Modbus department...
S7 PLC as a MODBUS slave
Originally posted by Fatima on 22 April, 2014 - 8:29 am
would like to make S7 PLC as a MODBUS slave and a PC Master MODBUS
New Replies:
Forgot to mention in my previous post. The reason I distinguished between tech and business aspects...
Have never done it using the Siemens Ethernet port, but I have done that on a 315-2DP using a...
Topic: Communications systems and equipment.
from the Forum department...
MODBUS Function code
Posted by Hemant on 22 April, 2014 - 3:16 am
MODBUS function code of address word
Originally posted by Detlev Neumann on 17 April, 2014 - 4:09 am
Could I say that with the following facts my device is MODUS-RTU compatible
New Replies:
Agreed. Other than noting that you should be as flexible as possible on serial parameters (and...
By Lynn August Linse on 17 April, 2014 - 11:10 am -
Looks good to me, and the 'no parity' option *IS* important as some Modbus devices don't support...
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:
By Lynn August Linse on 21 April, 2014 - 1:56 pm -
The "try a PC" option is always a wise first-step ... make sure you can trust your tools...
I'd suggest you first try an easy way to use a PC: http://www.ctrlterm.com/custom.htm Once the...
Topic: Software, including programming, OS issues, etc.
from the Forum department...
MODBUS COMPATIBILITY ISSUES WITH WINDOWS 7
Posted by SALIH SMA on 21 April, 2014 - 7:58 am
We are facing problem with Modicon MODBUS Serial IO Server 7.5 (7.5.0.7) with win7 as compatibility issues.
Topic: Software, including programming, OS issues, etc.
from the ANY department...
Software suggestions
Posted by Centrafused on 17 April, 2014 - 8:04 pm
New to automation and searching for a simple solution on some safety concerns.
Topic: Communications systems and equipment.
from the Instrumentation department...
ML1400 PLC communicate PIC 16f874 over modbus protocol
Posted by Srinivas on 17 April, 2014 - 11:02 am
ML1400 PLC communicate with PIC 16f874 over modbus protocol and write data to LCD connected to microcontroller
Topic: Communications systems and equipment.
from the Forum department...
MODBUS Break Condition & Checksum
Originally posted by Derek on 16 April, 2014 - 12:14 pm
MODBUS RTU using RS485 to RS232 converter connected to RS232 to USB converter to communicate with electric meter using MODBUS Poll.
New Replies:
By Lynn August Linse on 17 April, 2014 - 10:53 am -
Having the RS-485 +/- reverse (or swapped) will usually look like a BREAK condition if blindly...
Maybe try a different converter (or your current setup with another slave). FTDI sells some that...
Topic: Communications systems and equipment.
from the Automation department...
DCS Yokogawa Communication Issue
Originally posted by Zarar on 13 April, 2014 - 2:21 pm
Yokogawa DCS communication with Modbus slave device using ethernet redundant connection with ALE111.
New Replies:
By Elbert van der Bijl on 17 April, 2014 - 5:15 am -
this behavior is by design and it will not occur when the Modbus slave is correctly responding to...
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: 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: 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?...
Topic: Human-Machine Interface and SCADA.
from the Forum department...
Connecting Floboss 107 to DeltaV
Posted by John on 11 April, 2014 - 5:13 pm
Student with a project to connect a Floboss 107 to DeltaV for an HMI.
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: 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:
No that's a star and it's a bad idea because 20 M of unterminated cable will give you reflections...
Dear CWW, Maybe I use the wrong wording in my post, but I am not using the star topology. I try...
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...
That doesn't sound like a workable configuration. 485 doesn't like star layouts. You can use...
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 - 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: 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: 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: 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...
Posted by Automation1971 on 5 April, 2014 - 4:01 am
Is there a simple Device to send multiple digital Inputs to a Modbus Slave Register?
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 (+)/(-)...
By Lynn August Linse on 4 April, 2014 - 11:50 am -
Well, if 3 different test tools don't work, a fourth wouldn't work either. So one of these is...
>>...with the Simply Modbus software, I'm not able to get the response from the slave device....
Topic: Continuous process industries, DCS questions.
from the Process Automation department...
Bailey Infi90 System
Originally posted by Harsha on 20 March, 2009 - 6:10 am
Limitations of Bailey Infi90 System.
New Replies:
The only way I know to create a .NBS file is to save from controller, then look for it in the...
Topic: Local and wide area networking in factory automation.
from the Modbus department...
Modbus over GPRS
Originally posted by Antonio Mota on 16 September, 2013 - 11:11 am
Retrieve data from MODBUS energy meters remotely using GSM GPRS.
New Replies:
Hi Antonio, The GT-540 (2G) and GT-540-3GWA (3G) are Modbus RTU device servers that allow you to...
Topic: Communications systems and equipment.
from the Sending control words to the drive department...
Altivar 12 control via Modbus
Originally posted by TeaMan on 8 February, 2014 - 10:49 pm
Unable to send control or speed signals to my Altivar 12 drives from Mach 3 software on a PC.
New Replies:
Maybe you have the same problem as i did; please see http://modbus.control.com/thread/1396077823...
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:
Finally got things going, in case anybody is struggling with the same here my solution: Modbus...
> I'm hex illiterate. > What's the URL for the device's modbus manual with a map? ...
I'm hex illiterate. What's the URL for the device's modbus manual with a map?...
Posted by Heru Iqbal on 30 March, 2014 - 12:49 am
After you read this thread, Now you can create your own HMI by using Microsoft Excel and HINET Modbus DDE Server.
Posted by Cleto on 27 March, 2014 - 10:42 pm
Equivalent register address of PLC to SCADA
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...

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