Read and participate in active technical discussions with automation and industrial controls users from all over the world.
Control.com - Nerds in Control
Member Login
Modbus Links
Search
Jump to a Date
Cool stuff
RSS Feed
Use this link to get an RSS feed of the Modbus Community article flow, for private, non-commercial use only:modbus.control.com/rss/
To get a personalized feed, become a member at no cost.
Can only read 6 registers from Controlotron 1010 flow meter via Modbus
New Replies:
Yes, If you are experiencing a communication failure and the active light stays on then you will...
Can MicroLogic PLC read Modbus Holding Registers in the 5xxxx range?
New Replies:
By M Griffin on 17 October, 2009 - 1:43 pm -
Thanks to Mark for the correction. It appears that old versions of the Modbus spec did make some...
By Mark on 17 October, 2009 - 2:25 am -
Hello,
What Mr. Griffin said is 99.99999% accurate.
The current specification: MODBUS...
The typical Modbus Address Scheme is :
0x = Digital Outputs (Bit)(Read / Write)
1x = Digital...
By Harvard on 15 October, 2009 - 11:31 am -
Try reading Register = 50102-40001 = 10101 = 0x2775...
By Patrick Lansdorf on 15 October, 2009 - 3:02 am -
Hi,
I cannot answer if a MicroLogic PLC can read 5xxxx registers. But if it cannot, I would...
I would like to see some sample code. where a micrologic 1100 is being used as a Modbus master.
I want to understand whether it makes sense to convert to a report by exception basis in PLCs and whether it is even possible?
New Replies:
By M Griffin on 7 September, 2009 - 1:07 pm -
From what I remember about DF1, if you get rid of the AQ/NAQ then you have the same cycle as...
By M Griffin on 4 September, 2009 - 12:37 am -
As another person has mentioned, there is only so much performance you can squeeze out of a 1200...
Ok, Maybe I come from an environment of complexity, because we would never send back all the analog...
By M Griffin on 2 September, 2009 - 10:14 pm -
Like almost all protocols, Modbus is strictly client/server (or master/slave). You poll the server...
How to map variable length data to holding registers?
New Replies:
Now, that took me some time! But I have defined the registers (and am very glad that's finally...
By M Griffin on 19 July, 2009 - 3:14 am -
I will start off by saying that what would probably help a lot is to sit down and imagine yourself...
By M Griffin on 16 July, 2009 - 12:39 am -
You said that you're not sure about "the max data length of many variables". They're 32...
Has anyone setup Modbus between DeltaV and Micrologix 1200?
New Replies:
By DSiler on 14 July, 2009 - 1:30 pm -
I have done it and if I recall correctly I had to slow the baud rate on the micrologix to 9600. For...
Need information about layout of registers.
New Replies:
By Nick Mueller on 1 July, 2009 - 4:32 pm -
Thanks!
Your answer absolutely addressed the philosophical side of my problem.
There are...
By Mueller Nick on 30 June, 2009 - 1:03 am -
Hi!
Yes, I have read the ModBus docs. But the layout of registers, coils, inputs has so much...
By M Griffin on 28 June, 2009 - 11:04 pm -
There are four types of Modbus memory - Coils, Discrete Inputs, Holding Registers, and Input...
ASI to MODBUS Converter
New Replies:
By Patrick Lansdorf on 8 April, 2009 - 10:02 am -
Hi,
HMS have a gateway from AS-i Master to Modbus RTU slave. For information about the gateway...
some Abbreviations in Modbus Specification
New Replies:
some abbreviation which cann't explained Clearly confused the new learner.
...
By M Griffin on 25 March, 2009 - 3:26 pm -
I have version 1.01 of the spec, and it says the following:
VP - Positive 5...24 V DC Power...
Seeking an equivalent of a Siemense Simocode Pro V but with a Modbus TCP or straight ethernet output.
New Replies:
Andrew's request was for "a similar product to the Simocode that outputs direct MB/TCP",...
By YL on 9 March, 2009 - 8:25 am -
See the ABB's AC500 PLC.
Its small, extremely smart and fits for your needs. By default MB TCP and...
Creation of modbus dll.
New Replies:
By M Griffin on 3 March, 2009 - 5:14 pm -
By "modbus dll" I am assuming you mean you want to create a Modbus protocol library that...
Seeking in-depth information about OPC
New Replies:
I think you need to be CLEAR about what exactly is required - I often hear the term OPC tossed...
Using more Memory Maps inside 1 Memory Map
New Replies:
Thanks for your information. I already thought this would be the solution.
Defining an Error is...
Modbus library for NI Measurement Studio?
Trying to learn Modbus from ground up. Looking for good, understandable resources.
A request for information about Modbus RTU
I have a project to read data from Modbus using VB, but I don't know how to read data.
Does anyone have a spec sheet for a modbus plus cable p/n 490NAA271 02?
AREVA relays with Intellution Ifix.
Developing an application with both modbus and modbus/Jbus equipments
Your use of this site is subject to the terms and conditions set forth under Legal Notices and the Privacy Policy. Please read those terms and conditions carefully. Subject to the rights expressly reserved to others under Legal Notices, the content of this site and the compilation thereof is © 1999-2009 Nerds in Control, LLC. All rights reserved.