from the Forum department...Master Data access using Nmodbus
data access from modbus slave is blocking
By Lynn August Linse on 6 August, 2012 - 1:57 pm -
> Are you using libmodbus or your own implementation of Modbus It is our own proprietary...
By Mark on 5 August, 2012 - 10:54 pm -
Hello, > So if you have 20 remotes, use 20 threads and 20 sockets... Be advised, on...
By Manish on 5 August, 2012 - 9:58 pm -
Thanks Lynn, Are you using libmodbus or your own implementation of Modbus Regards, Manish ...
By Lynn August Linse on 1 August, 2012 - 10:21 am -
I have *NOT* used nmodbus, however all of my 'master' or 'bridge' code uses 1 thread (or task) per...
from the Forum department...Interfacing an ArchestrA Galaxy to Instep eDNA Historian
Interfacing an ArchestrA Galaxy to Instep eDNA Historian
from the automatization department...Communicating between MODBUS RTU and WAGO
problems with communication between Wago and Seneca
By Bruno on 5 August, 2012 - 8:55 am -
Thank You, What is meaning of that error?...
By Bruno on 5 August, 2012 - 6:09 am -
Thank You for helping. I think that I made all above and still I don't get signals from ZSG. Can be...
By Ivan Popov on 5 August, 2012 - 2:18 am -
The error is MB_ILLEGAL_NUMBER_OF_POINTS. You can check this from the /library manager/data types...
I have no idea what error code 5 is, but here's a list of things that can go wrong with serial...
from the serious department...ModbusRTU Master Over TCP/IP Interface in Java
I'm developing a ModbusRTU Master Over TCP/IP Interface to read a ModbusRTU electricity meters data. the meters are working over RS485 network.
You can try xMasterSlave for Modbus protocol at www.tgscada.com. It is a completely freeware....
By Lynn August Linse on 1 August, 2012 - 10:16 am -
> the packet screenshot of the software over a virtual "com" viewed from wireshark: ...
The ip address of the converter is 192.168.0.190. If i test from the modbus poll (trial) over a...
By Lynnl on 31 July, 2012 - 10:06 am -
To expand on what Andrzej says, you have a complex chain of possible failures facing you, so start...
By Andrzej on 31 July, 2012 - 3:15 am -
Hello, Try connect to modbus slave simulator (like Modsim), to see what your application is...
from the Plant Engg. department...Microsol PX2000 Data concentraor
Need to know the Microsol PX2000 protocol and its' format for Communication with Sub devices like switch gears and Starters for Medium voltage and Low voltage Sub station interfaces.
By abuashfaq on 30 July, 2012 - 7:59 am -
Thanks Mr. Lobo, I could collect the info from DCS Sub system I/O module mapping. Where as how...
from the Forum department...ModBus in PLC
How the protocol is implemented in a PLC?
By barkouky on 29 July, 2012 - 5:16 am -
Hello, Im new to modbus and Im having trouble starting up communication. My set up consists of a...
from the Power Division department...MODBUS control of power sources and loads
Control of power sources and loads via MODBUS
Fair enough. Then sounds like you want a PLC or something of that like. For another example see...
By Thomas Podlesak on 27 July, 2012 - 11:38 am -
I appreciate your response and looked at some of your references. They seem to partially solve the...
If I understand your problem correctly, it is easily solved by off the shelf components. I know it...
By Lynn August Linse on 26 July, 2012 - 2:51 pm -
Sounds almost like you want to make your own box. However, there are LOTS of 'Modbus Load...
from the way out of my league department...JBUS Bluetooth Device
I am looking for a device that can plug into a jbus connector and stream data via bluetooth
By Lynn August Linse on 27 July, 2012 - 2:30 pm -
In the US, 433MHz is primary used in children's toys and "RFID" applications with modest...
Hi Lynn: Kindly thanks for your reply. I'm a freshman on the CONTROL forum. Hence I have a few...
By Lynn August Linse on 26 July, 2012 - 2:44 pm -
Modbus won't help you - this is an old post so I assume Chuck has moved on. Talking to a...
Hi Sir: This is a fleet management solution. We have experienced the field for many years....
from the R&D department...Anybus Master Module-profibus
Using Anybus (HMS) Master Module for Profibus master and last 2 weeks I lost 2 units. IO points are isolated.
from the A-B says it works! department...SLC5/05 to micrologix Radio Comm
Using an A-B SLC5/05 as a polling master. If a remote radio goes down it wipes out the complete system.
By Ken Roach on 25 July, 2012 - 1:09 pm -
The user manuals usually give very simplistic examples of automatic re-triggering or periodic...
from the Asking beats searching department...GE iBox
Require information on programming the GE iBOX.
from the heavy electrical complex department...modbus poll and tapcon230
timeout error on modicon modbus p1 mbus
from the Automation List department...Unity vs. Concept
What is difference between Unity and Concept programming?
By teboho on 23 July, 2012 - 8:16 am -
> Unity is new era at Schneider, you can use Premium and Quantum Families as well, but not...
from the Projects department...Talk to a Zelio Logic Relay with an Ethernet/Modbus module.
I want to talk to a Zelio Logic Relay with the SR3-NET01BD Ethernet/Modbus/TCP/IP module. (Schneider Electrics)
By henneuse alain on 19 July, 2012 - 10:11 am -
Zelio use Word %MW16 to %MW19 in R/W and %MW20 to %MW23 in R only Use my soft for hmi to...
from the IT department...Error while reading from EM6436 energy meter.
Error while reading from EM6436 energy meter.
from the "What is normal practice?" department...Consecutive registers vs. shared registers across projects
Consecutive registers vs. shared registers across projects.
By Lynn August Linse on 17 July, 2012 - 11:25 am -
Actually, you can have it both ways (unless you are running out of logic space). Nothing stops...
from the Control system department...NAMUR - Maximum distance
NAMUR - Maximum distance and signal amplifier
from the Forum department...Jace controller/modbus
Jace/modbus setup - cannot read all slaves on bus
from the Plant Engineering department...DCS Control bus network
Probability of Redundant ring network for DCS systems to be explored in view of chances control failure if go with Tree/Mesh/star topology.
By Mohamed on 15 July, 2012 - 4:11 am -
Thank you Mr. Dick Caro, For the update....
from the Forum department...Multiple Modbus RTU device to Single PLC via wireless help
need help on modbus integration over wireless.
By Manish Are on 10 July, 2012 - 12:42 pm -
Yes You can use Rs 232 Interface radios. You can visit www.prosoft-technology.com for product...
from the MODBUS department...Connecting Siemens Circuit Breakers using Modbus
How to interconnect Siemens Air Circuit Breakers and Siemens MCCB with modbus communication
from the Controls department...Alarm Segregation ABB AC 800F
Alarm segregation in ABB AC800F
from the Automation List department...Walkie talkie near PLC
can the signal from a walkie talkie radio erase the contents in a PLC processor if we operate the same near by.
Regarding Walkie talkie near PLC issues, tests attempting to reproduce source, path, and...
from the New to Modbus department...Modbus RTU on 485 to ModbusTCP on Fiber converter
Taking Modbus RTU signal from an existing series of Electrical Utility Meters and send it along the existing fiber backbone.
By automationtechie on 29 June, 2012 - 6:59 pm -
We have implemented this solution. The Modbus RTU device was a slave device in our setup. ...
from the Modbus Comm Guru's department...Modbus ASCII - Probability of LRC Errors Going Undetected
What is the probability that a Modbus ASCII message using LRC error checking will be processed even thought bits in the message are mixed up?
I'm not an error-checking-and-correcting expert, but I do know there is much more to error checking...
from the Instrumentation Dept. department...Implementing Time Synchronisation between DCS and PLCs
Time synchronisation between DCS, PLC and all subsystems.
Hi Every DCS has a windows platform interface. With this, you can have all your DCS/PLC systems...
from the Modbus numbers department...Modbus numbers seem to low
By Lynn August Linse on 26 June, 2012 - 1:21 pm -
It is pretty much impossible to accurately estimate the number of Modbus nodes in this world since...
Baker's First Law of Federal Geometry:
A block grant is a solid mass of money surrounded on all sides