A Modbus Users' Community

A Control.com syndicated community


Read and participate in active technical discussions with automation and industrial controls users from all over the world.

Link to Control.com main site
Control.com main forum
Link to the Modbus.org site
Modbus.org main site
Developers' Forum

To view additional discussions, click here.


Modbus.org Users' Forum

Post a new message

Alarm and DIO Control
Applications Posted by Erik on Thursday, September 04, 2008 at 01:07 AM
from the Automation List dept.
Toggling a DIO when an alarm condition is set with out the interaction of the master.
Read More or Reply...
(2 comments)

Modbus - XXMIT Block - Parameters - Active and Done
PLCs Posted by Caleb_E on Wednesday, September 03, 2008 at 01:36 AM
from the Modbus XXMIT Crew dept.
For the XXMIT block, what constitutes an operation? Is it just the actual sending of a query or is it the sending of a query and receiving of a complete response that makes up one complete operation?
Read More or Reply...

New "DCS" control system selection
Process Control Posted by George Whaley on Wednesday, September 03, 2008 at 12:24 AM
from the Instrument and Control systems dept.
Requesting member feedback for the replacement selection of an existing petrochemical control system "DCS".
Read More or Reply...
(3 comments)

MODBUS FOR PLUS II AB
Communications Posted by DIANA HERRERA on Monday, September 01, 2008 at 02:14 PM
from the ALLEN BRAIDLEY dept.
Is modbus protocol available on the Variable Frequency Plus II?
Read More or Reply...

Modbus master as DCS and HMI as slave
Communications Posted by GPatel on Wednesday, August 27, 2008 at 10:19 PM
from the Engineering dept.
Communication to DCS system
Read More or Reply...
(2 comments)

DNP3 on Delta V Emerson
Communications Posted by Hildemaro Carrasquel on Wednesday, August 27, 2008 at 10:13 PM
from the Instrumentation and Control dept.
I am analyzing the posibility for connecting Emerson Delta V (Unit package to supervisory) with Open Protocol...
Read More or Reply...

Modbus Register List Rules of Thumb
Communications Posted by Matt Mihalcin on Wednesday, August 27, 2008 at 10:10 PM
from the Modbus Register List Rules of Thumb dept.
Are there rules of thumb to abide when constructing a Modbus register listing w.r.t. floats (32-bit), and ints (16-bit)?
Read More or Reply...

ModbusTCP/IP data concentrator
Engineering Posted by Syed Hussain on Wednesday, August 27, 2008 at 09:58 PM
from the Modbus Interface dept.
Modbus TCP/IP data concentrator. Need a device that can receive data from mutliple Modbus TCP/IP slaves, stores them and can act as a MModbus TCP/IP slave for the DCS controller.
Read More or Reply...
(9 comments)

ModbusRTU Write Coil with Pulse output
Communications Posted by Prakashkumar on Tuesday, August 26, 2008 at 04:57 PM
from the Honeywell EPKS Modbus dept.
We have a problem with communication between Honeywell EPKS DCS with third party system through ModbusRTU for Writing Coil.
Read More or Reply...

Modbus and Unity
PLCs Posted by Tenshi on Tuesday, August 26, 2008 at 09:42 AM
from the PLCs dept.
Hello.
Do you know how I can restrict reading the value of a variable from a PLC?
Read More or Reply...

Cool Stuff

Check out the full collection of postings by topic.

Older Stuff

Thursday, August 21
  • SCADADPack LP 
    Wednesday, August 20
  • Modbus function code 126 (7E Hex)  (1)
    Tuesday, August 19
  • PC industrial control  (5)
    Sunday, August 17
  • Prosoft modbus settings 
    Saturday, August 16
  • Problem with Modbus serial repeaters 
  • Mark-V Diagnostic Alarms  (2)
    Thursday, August 14
  • Clearing the history log 
    Tuesday, August 12
  • Modbus - reads of multiple registers  (5)

  • The man who sets out to carry a cat by its tail learns something that will always be useful and which never will grow dim or doubtful. - Mark Twain
    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 ©1999-2006 Control Technology Corporation. Powered by Python, Zope, and Squishdot, inspiration by Slashdot. (Vers.ZSQ1.0)