Posts from...
Today, Friday, August 22, 2014
Topic: Software, including programming, OS issues, etc.
from the Forum department...
Adding Modbus register values together
Posted by David on 20 August, 2014 - 3:07 pm
How can you add MODBUS registers?
Originally posted by Harvard on 15 August, 2014 - 1:17 pm
Need to know how a slave device that lacks access to the RS-485 COMMON manage to maintain a Receiver common mode voltage between -7 and +12.
New Replies:
Many times 2 wire devices are referenced to frame ground and do not supply a terminal with + and -....
By Lynn August Linse on 18 August, 2014 - 10:17 am -
I guess one work around would be - if you have the common wire available in the bus cable - is use...
Thank you for the responses and no this is not a trick question. I am dealing with a...
Common mode voltage can be construed as the average of the differential signals, the more apt...
Topic: Communications systems and equipment.
from the Forum department...
Modbus Register Address
Originally posted by Whitepage on 15 August, 2014 - 4:30 am
I have a question about entering the register address in our program PME when I have a 4-digit address.
New Replies:
Actually, the original modicon only supported 0-999 addressing. Anyways, if your driver only...
If you are attempting to pair a master that won't allow configuration of offsets >9999 to a...
Dear Fred , Thanks for your advice. But now i don't know what i have to do for this...
Dear Darrin, Thanks for your reply Can you help to show me the way i can change the modbus...
Greetings, the short and quick answer is nothing. The first number in a Modbus register...
Topic: Sensor technologies.
from the Need to find a sensor department...
Lightning Sensor
Posted by Andrew on 19 August, 2014 - 7:18 pm
I'm trying to find a lightning sensor
Posted by ioudas on 19 August, 2014 - 1:16 pm
Trying to connect a bm85 to a 984 265. Via MODBUS+
Originally posted by ASCF on 4 March, 2014 - 4:08 am
I try to connect a Power Circuit breaker from Schneider to a Siemens PLC using Modbus RTU protocol.
New Replies:
Hi! Do you have some solution on your problem. I see we have the same HW and the same problem,...
Topic: Communications systems and equipment.
from the Automation List department...
Re: Replace RS-485 with Siemens Profibus Cable
Originally posted by Curt Wuollet on 14 August, 2014 - 9:15 pm
I am building a Modbus RTU network and am considering replacing RS-485 cable with Siemens Profibus cable. Want to hear from those who have done this.
New Replies:
Thanks Curt. I appreciate your answering. I donīt really mind about the purple color. :) Jimmy...
Topic: Communications systems and equipment.
from the ELECTRICAL PROJECTS department...
Replace RS-485 with Siemens Profibus Cable
Posted by JIMMY SALDIVIAS on 14 August, 2014 - 12:24 pm
I am building a Modbus RTU network and am considering replacing RS-485 cable with Siemens Profibus cable. Want to hear from those who have done this.
Topic: Communications systems and equipment.
from the modbus community department...
RS-485 cable recommended reference
Originally posted by bammaroc on 13 August, 2014 - 6:33 am
RS-485: Reference recommended cable for Modbus communication between DCS and MVI94-MCM systems or PLC
New Replies:
Google Belden DataTuff Look at the bonded pair versions. Regards cww...
Originally posted by Mehul Shah on 16 May, 2012 - 1:43 am
Need to find out if PowerLogic Circuit Monitor Series 2000 supports Modbus or not. Also, if they do, need to find out the modbus register maps for these meters.
New Replies:
Dear Andreas, Could you please send your e-mail? So i can send attachments and other related...
By Andreas Sauerwein on 7 August, 2014 - 1:19 am -
Hi Ercan ERDAS, We try to Implement such a application, and Schneider is not able to give us...
We have similar application and if you write down your email i can send application architecture...
Karl, You said that you are using the EGX100 in your plant and are able to access all the...
Hello, I have a similar job to what you described above. How did you end up solving your problem...
Topic: Communications systems and equipment.
from the control department...
Modbus interface with T3000
Posted by control on 4 August, 2014 - 8:53 pm
Other than Siemens device to interface with Siemens T3000 for modbus communication
Topic: Local and wide area networking in factory automation.
from the The Banging Head Against Wall Department department...
RS485 Issues - Modbus Temperature Controller to Ethernet
Originally posted by Plutonius on 1 August, 2014 - 9:08 pm
I am currently have a bit of an issue connecting to a Love 2600 temperature controller via RS485 full duplex with a Grid Connect NET485 Modbus RTU to TCP ethernet bridge.
New Replies:
Are both Love and the RTU side of the bridge 4 wire, full duplex? If one side is 2 wire half duplex...
By Lynn August Linse on 4 August, 2014 - 10:17 am -
Do make sure the slave address is correct. For example, if the Modbus/TCP client/master is putting...
Topic: Engineering and workplace issues.
from the electrical, domotics department...
modbus-scada
Originally posted by Remi Van Damme on 2 July, 2014 - 1:15 am
is it possible in a modbus network to have a SCADA system which polls for data from the slaves and another SCADA system which also collects data from the same slaves?
New Replies:
We have 2 solutions for your application. In order to avoid having 2 masters in your PC, you will...
If you use a Modbus TCP gateway in front of the Modbus RTU line it is possible. If you can only...
Yes, it is possible. We sell a product that can permit up to 3 Modbus Masters to connect to a...
You can't do it on the same subnet, as a Modbus subnet can have only one master. But the ICC...
Originally posted by Vishal on 1 August, 2007 - 10:12 am
I have a system which transmits signals in RS 232C format. There is a CONTROL System, which accepts signals in RS485 Modbus Format.

Please share you thoughts as to what needs to be done to interface these to systems.
New Replies:
For a complete solution, you can use our Modbus RTU Utility to read the data using our RS-232 to...
An old PC and some software will do that. But if it's converting from Modbus ASCII to Modbus RTU...
Hello, Very interesting device: Modbus RTU Serial Gateway I would like to know if it is...
Topic: Software, including programming, OS issues, etc.
from the engineering department...
Modbus RTU utilities
Originally posted by viks on 21 July, 2014 - 2:28 am
help needed in finding the software facilitating reading data from the sensors via RS485 into industrial computer and providing it for a SCADA application.
New Replies:
On http://pvbrowser.org you can find our open source project....
Topic: Local and wide area networking in factory automation.
from the Forum department...
Communication Error with MODBUS DCS RTU
Posted by michael on 22 July, 2014 - 3:04 am
MODBUS over ethernet connection between yokogawa DCS and abb rtu anr96 has a communication error after several minutes.

Originally posted by bammaroc on 18 July, 2014 - 1:45 pm
communication between DCS CS 3000 and Allen Bradley platform FlexLogix 5434 using Modbus protocol
New Replies:
Hi Bammarroc, You can't pair MVI46-MCM with flexlogix processor, MVI46 only suit for SLC...
Topic: Power generation equipment control.
from the INSTRUMENTATION department...
Problem with modbus getway
Originally posted by Not the real CSA on 9 July, 2014 - 5:32 pm
Communicating with Mark VI via HMI or getway
New Replies:
By Not the real CSA on 11 July, 2014 - 4:58 pm -
the DCS is EPKS Honeywell the communication before is very well MARK VI communicate with DCS...
First of all what DCS are you trying to link to? MKVI has a GSM protocol they use that is very...
Topic: Communications systems and equipment.
from the Forum department...
MODBUS TCP slave
Originally posted by Bill on 22 June, 2014 - 2:50 pm
I need a MODBUS TCP slave library (Compact Framework 3.5 friendly).
New Replies:
By Laythe Al-Janabi on 9 July, 2014 - 3:56 pm -
> I have created a VB.NET application running under Windows Embedded Compact 7 (Compact...
Originally posted by MH on 7 July, 2014 - 7:20 am
Socomec DIRIS A40 RS485 ModBus communications problem
New Replies:
Did you tried the old table registers addresses? Starting from &H300...
Topic: Local and wide area networking in factory automation.
from the Control department...
Profibus to Modbus
Originally posted by Wade on 9 February, 2012 - 11:50 pm
Profibus to Modbus Conversion for Simatic S5
New Replies:
Simply putting a GSD file in the ES will not change anything. The hardware used in TXP is not...
Topic: Local and wide area networking in factory automation.
from the Engineering department...
RS485 multidrop network drops after few days
Originally posted by P Paul on 3 July, 2014 - 11:58 am
Modbus connections drops after few days and it resumes by changing modbus parameters in slave device.
New Replies:
By Lynn August Linse on 3 July, 2014 - 1:21 pm -
Based on 25 years experience with RS-485, sounds to me like you have a floating ground between the...
Topic: PLCs and related questions.
from the Forum department...
Connection closing in Modbus-TCP
Originally posted by Satoshi Sakai on 30 June, 2014 - 6:54 am
I would like to know if Modbus-TCP connection should be opened/closed in every command sending or not.
New Replies:
By Lynn August Linse on 30 June, 2014 - 9:29 am -
It is not 'normal' behavior in the TCP/IP world, but some misguided engineers on early Modbus/TCP...
Topic: Communications systems and equipment.
from the Automation department...
FC51 Danfoss VFD MODBUS
Originally posted by Derik on 7 September, 2009 - 2:12 pm
I need to control a FC51 Danfoss VFD with LS PLC.
I need to start , stop & jog the drives.
New Replies:
Hi, I have this problem too. I have set all the parameters to control the drive as modbus. I...
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...
Curt, thanks for the transmission line primer; the information was quite helpful. I have a...
Originally posted by arun patole on 24 June, 2014 - 12:10 am
Communication between PC and microcontroller through serial port
New Replies:
You can browse our Modbus implementation on http://tinyurl.com/az4llre rlModbus is part of our...
Topic: Communications systems and equipment.
from the Electronics & control department...
PC communicatio with L&T Quasar power meter
Originally posted by Ajinkya on 30 November, 2009 - 1:11 am
PC communication with L&T Quasar power meter
New Replies:
You will get the data from energy meter directly in standard format of MODBUS. no need to have any...
Topic: Communications systems and equipment.
from the Forum department...
GE Multilin 369 and Kepware OPC
Originally posted by ADAM on 19 June, 2014 - 1:34 pm
Which driver do I choose?
New Replies:
The Multilin could be set to do modbus or it could have a DNP communications module in it. Assuming...
Topic: Communications systems and equipment.
from the Modbus TCP communication HC900 department...
Modbus TCP communication HC900
Originally posted by Frederik on 19 June, 2014 - 3:14 am
Modbus TCP communication HC900
New Replies:
We have example documents on our website of connecting WinCC to KEPServerEX and we have a driver...
Topic: Human-Machine Interface and SCADA.
from the URGENT SUPPORT REQUIRED department...
Wonderware Communication Issue
Originally posted by OK on 17 June, 2014 - 3:37 pm
Wonderware server application slows down on pulling out LAN wire or disable any of the four networks we use
New Replies:
For communicating with modbus over Ethernet, the DASMBTCP service works quite well with Wonderware....
Topic: Communications systems and equipment.
from the Department of Redundency Department department...
Using OPC to communicate with GE MKVIe
Originally posted by Brian on 4 June, 2014 - 2:31 pm
I'm trying to find out if anyone is using OPC to talk to a GE MKVIe from an ABB INFI90 DCS System.
New Replies:
Brian Hall, I completely missed your response; sorry. For ABB to do what they're saying, they...
Brian and CSA, I can tell you that I have worked at two sites now and have configured a...
CSA, We've not been able to talk directly to the TCP using Modbus yet. We're going through the...
Brian, My experience may be a little dated (I haven't seen a Mark VIe installation for over a...
Topic: Communications systems and equipment.
from the Forum department...
GE multilin 369 with a Modbus TCP
Originally posted by brad on 6 February, 2009 - 3:03 pm
can you use a Modbus/TCP Ethernet communication between GD multilin 369 and a compactlogix Ethernet port?
New Replies:
By Patrick Lansdorf on 13 June, 2014 - 1:46 am -
One other option would be to use a gateway... My understanding is that the GD multilin 369 has...
By Chris Jennings on 12 June, 2014 - 1:54 am -
I think you would need to use a ModbusTCP card, not the normal Ethernet/IP cards used with...
Originally posted by Ben Kinsella on 13 June, 2008 - 7:06 pm
Is it possible to plug and play?
New Replies:
Modbus does not support auto discovery...
Topic: PLCs and related questions.
from the Tech department...
Modbus slave failures
Originally posted by Derek on 25 March, 2011 - 1:01 am
Modbus failures when adding more than one slave
New Replies:
Concerning the transmitter. Poll delay: delay between two polls. Silent Time or Write delay:...
Originally posted by deep123 on 11 June, 2014 - 3:37 am
i want to connect one energy meter to two separate masters.
New Replies:
By Lynn August Linse on 11 June, 2014 - 9:40 am -
Two easy solutions show up on the market: 1) use a Modbus/TCP to RTU bridge (so: Ethernet to...
Topic: Application Questions and Problems
from the Need shaft turner with Modbus! department...
Simple VFD
Originally posted by OEM Engineer on 6 April, 2011 - 10:22 am
Looking for a very basic shaftturner with Modbus communications
New Replies:
By Siemens Drives guy on 11 June, 2014 - 9:13 am -
Just wanted to clear up the modbus connectivity question for siemens drives. In general all of our...
Originally posted by vk on 9 June, 2014 - 9:39 am
Problem in command execution from dcs on modbus
New Replies:
I have used a similar architecture. in my case the command executed from the hmi is from the server...
By Lynn August Linse on 9 June, 2014 - 1:09 pm -
Probably your HMI is being greedy & building up an excess queue of requests, while the DCS is...
Topic: PLCs and related questions.
from the Advice for a newb department...
Modbus "pollsets"
Originally posted by GD on 5 June, 2014 - 6:27 pm
Need advice on creating pollsets in Isagraf
New Replies:
Perhaps by telling us what you are generating the pollsets on? Regards cww...

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