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Communications
Posted by Hannibal on 10 October, 2008 - 2:12 pm
How many Modbus devices can be placed on a single Modbus/485 loop using Prosoft module MVI56-MCM?
Topic: Communications systems and equipment.
from the Forum department...
Modbus communication
Posted by sunil on 29 September, 2008 - 12:03 pm
I am trying to communicate with ENERCON CONZERV ENERGY METER EM6434 having RS485 2 wire connection using SCHNEIDER TWIDO PLC and RS485 card inserted in port 2.
Topic: Communications systems and equipment.
from the serious department...
ModBus Exception on read only register
Originally posted by Enrico on 23 September, 2008 - 10:06 am
What exception code does the unit transmit if the master attempts to write a read only register?
New Replies:
Hello, Differing allowed. I knew when I posted the reply someone would come up and say but but...
Read-only registers are called "Input Registers". Read-write registers are called...
I beg to differ. The Modbus standard does define read/write for the 4 basic data registers in...
Acutally Input registers 0x04 and input coils (discrete inputs) 0x02 are essentialy read only. You...
Topic: Communications systems and equipment.
from the Forum department...
Modbus exception error
Posted by Zeeshan on 23 September, 2008 - 7:37 pm
I am having an issue talking to a SEL 2030...
Topic: Communications systems and equipment.
from the Automation List department...
Modbus RTU communication on RS 485
Posted by Anon on 23 September, 2008 - 2:05 am
Troubleshooting Modbus RTU protocol ommunication on RS485 looping
Posted by Giri on 21 September, 2008 - 6:06 pm
want information on the data type and formats for the Holding register and Input registers
Topic: Communications systems and equipment.
from the RS department...
Modbus RTU RS 485
Posted by Pieter on 18 September, 2008 - 1:26 am
Maximum length of RS 485 cable between 2 devices
Topic: Communications systems and equipment.
from the Automation List department...
IEC 62056-21 to MODBUS or DNP
Posted by Eduardo Wong on 13 September, 2008 - 1:28 am
I need help to convert from protocol IEC 62056-21 to MODBUS or DNP, it's for a thermoelectrical plant.
Topic: Communications systems and equipment.
from the R&D department...
Fire Alarm to BMS via Modbus
Posted by Voulgaris Thanasis on 13 September, 2008 - 12:57 am
Protocol Modbus for fire alarm panel to BMS
Topic: Communications systems and equipment.
from the PLC/HMI Drivers department...
WinCC communication with Modicon Momentum PLC
Posted by Shalin on 12 September, 2008 - 1:21 am
Siemens WinCC HMI package to communicate to a Modicon Momentum PLC using MODBUS interface
Topic: Communications systems and equipment.
from the FREC department...
Modbus Driver for WinCC
Posted by Alipour on 7 September, 2008 - 5:14 pm
I want modbus driver for WinCC 6.0 SP2
Topic: Communications systems and equipment.
from the ALLEN BRAIDLEY department...
MODBUS FOR PLUS II AB
Posted by DIANA HERRERA on 1 September, 2008 - 2:14 pm
Is modbus protocol available on the Variable Frequency Plus II?
Topic: Communications systems and equipment.
from the Engineering department...
Modbus master as DCS and HMI as slave
Originally posted by GPatel on 27 August, 2008 - 10:19 pm
Communication to DCS system
New Replies:
We offer a product that allows two or three Modbus Masters to connect to a single Modbus Slave (or...
Topic: Communications systems and equipment.
from the Instrumentation and Control department...
DNP3 on Delta V Emerson
Posted by Hildemaro Carrasquel on 27 August, 2008 - 10:13 pm
I am analyzing the posibility for connecting Emerson Delta V (Unit package to supervisory) with Open Protocol...
Topic: Communications systems and equipment.
from the Modbus Register List Rules of Thumb department...
Modbus Register List Rules of Thumb
Posted by Matt Mihalcin on 27 August, 2008 - 10:10 pm
Are there rules of thumb to abide when constructing a Modbus register listing w.r.t. floats (32-bit), and ints (16-bit)?
Topic: Communications systems and equipment.
from the Honeywell EPKS Modbus department...
ModbusRTU Write Coil with Pulse output
Posted by Prakashkumar on 26 August, 2008 - 4:57 pm
We have a problem with communication between Honeywell EPKS DCS with third party system through ModbusRTU for Writing Coil.
Topic: Communications systems and equipment.
from the Modbus application software department...
Modbus query problem
Posted by David Cemin on 24 August, 2008 - 8:54 pm
PLC didnt answer
Topic: Communications systems and equipment.
from the Automation List department...
Modbus function code 126 (7E Hex)
Posted by Jan Klasen on 20 August, 2008 - 12:50 am
What does function code 126 (7E hex) mean and what response could I expect?
Topic: Communications systems and equipment.
from the Automation List department...
To implement Modbus Poll
Posted by sonainv on 10 August, 2008 - 3:52 pm
To query the status of the Registers of an energy meter using MODBUS RTU protocol
Topic: Communications systems and equipment.
from the Automation List department...
Modbus Communication between Twido & Altivar 2
Posted by Naveed ahmed on 10 August, 2008 - 3:51 pm
Modbus Communication between Twido and Altivar 21
Topic: Communications systems and equipment.
from the Automation List department...
Carter Wind Turbine Controller Interface - Modbus?
Posted by Darran on 8 August, 2008 - 8:09 pm
Is there anyone out there that might know anything about the Active Control Inc. serial comms protocol used by Carter wind turbines?
Topic: Communications systems and equipment.
from the Automation List department...
Modbus Mini-din
Posted by Julie on 8 August, 2008 - 7:40 pm
Modbus Mini-din
Topic: Communications systems and equipment.
from the Automation List department...
MODBUS Bit Order
Posted by Dan Marr on 6 August, 2008 - 12:56 am
Modbus Bit order: LSB to MSB (Left to Right Reading), or MSB to LSB (Right to Left Reading)?
Topic: Communications systems and equipment.
from the Automation List department...
Modbus addressing models
Posted by Fred Wedemeier on 26 July, 2008 - 1:53 am
Usage of most-significant decimal address to identify a data type.
Topic: Communications systems and equipment.
from the Visual Basic ActiveX department...
Visual Basic App Interface to Ethernet/IP remote I/O
Posted by Mark Gustafson on 26 July, 2008 - 1:35 am
Looking for an ActiveX OCX to interface with Ethernet/IP remote I/O
Topic: Communications systems and equipment.
from the engineer department...
Modbus RTPS
Posted by Joe on 23 July, 2008 - 11:04 pm
Is anyone using Modbus RTPS protocol?
Topic: Communications systems and equipment.
from the SBK department...
Magelis via Modbus with Twido
Posted by Lapic on 17 July, 2008 - 1:47 am
Communications
Topic: Communications systems and equipment.
from the Automation List department...
XBT GT4330 problem communications
Posted by Lapic on 15 July, 2008 - 12:13 am
Problem with communications between Twido PLC and Magelis (XBT GT 4330).
Topic: Communications systems and equipment.
from the Help department...
modbus with DCS-CS30000 or foxboro
Posted by PC on 13 July, 2008 - 10:06 pm
scanning of bits for modbus with DCS-CS30000 or foxboro
Topic: Communications systems and equipment.
from the Engineering department...
Error codes in Modbus
Posted by Miguel Allende on 9 July, 2008 - 11:35 pm
I am trying to communicate one PLC with a Modbus slave via Modbus RS-485, but I receive the error code number 9.
Topic: Communications systems and equipment.
from the Automation List department...
RS 485 Modbus communication
Posted by Neeraj on 9 July, 2008 - 12:47 am
How can device dependent operation (reading, writing) be performed on RS485 Modbus network?
Topic: Communications systems and equipment.
from the Automation department...
RS485/Modbus communication problem
Posted by Mohamad Hosny on 6 July, 2008 - 3:40 pm
Getting a problem to establish a communication between PC by using a RS232/RS485 PC-Adapter and an EROLECTRONIC PKP controller.
Topic: Communications systems and equipment.
from the Automation List department...
RTU modbus mode
Posted by TAT on 1 July, 2008 - 1:33 am
In most applications I see that in RTU mode, although parity is set to be NONE, stop bit is still set to be ONE. Why is that? Is stop bit supposed to be TWO because parity is NONE?
Topic: Communications systems and equipment.
from the Automation List department...
Using Modbus with PIC16f877A
Posted by itsme on 23 June, 2008 - 10:25 pm
I want to use Modbus protocol with PIC16f877A...
Topic: Communications systems and equipment.
from the Automation List department...
Number of MODBUS Slaves over TCP
Posted by AHK on 18 June, 2008 - 7:58 pm
Number of MODBUS Slaves over TCP
Topic: Communications systems and equipment.
from the Modbus/Rs232-485 conveter department...
Using Jamod library,but problem in connecting slave device
Posted by Kavya on 18 June, 2008 - 6:54 pm
Not able to establish connection with the modbus slave device using RS232 Communication.
Topic: Communications systems and equipment.
from the Modbus department...
Modbus slave interaction
Posted by Arvind on 14 June, 2008 - 4:08 pm
Need Help to know how to get responce from Modbus slave.
Topic: Communications systems and equipment.
from the R&D department...
Modbus Communication and Time Stamp
Posted by Ravi on 13 June, 2008 - 6:59 pm
Getting the status information of a device(example a relay) along with the time stamp on modbus protocol.
Topic: Communications systems and equipment.
from the A&D department...
MODBUS communication
Posted by garincha on 11 June, 2008 - 1:47 am
Problems with reading holding registers in MODBUS
Topic: Communications systems and equipment.
from the Automation List department...
174 CEV 300 10
Posted by Jaka Dolenec on 10 June, 2008 - 3:00 am
Connecting Twido PLC and RS485 devices over 174 CEV 300 10 bridge.
Topic: Communications systems and equipment.
from the Development department...
Modbus TCP/IP functionality
Posted by Dave Adams on 4 June, 2008 - 12:25 am
TCP/IP functionality required for Modbus TCP/IP
Topic: Communications systems and equipment.
from the Automation List department...
Modbus RTU 1.5t interval
Posted by Yury Kurilo on 4 June, 2008 - 12:01 am
What is the purpose of Modbus RTU 1.5t interval?
Topic: Communications systems and equipment.
from the Automation List department...
Honeywell DC1000 comm with WinCC
Posted by need your help on 3 June, 2008 - 1:03 am
Honeywell DC1000 comm with WinCC
Topic: Communications systems and equipment.
from the Automation List department...
Modbus Requests and Java
Posted by gishac on 26 May, 2008 - 12:36 pm
I'm trying to do a request to a modbus device, but I don't know how to build the request buffer to send.
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