plc with modbus rtu protocol

mughal

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• Jun 26, 2010

• #1

hi all
any one can send me a list of plcs with modbus rtu protocol on rs232 line?
which pls can oprate in rtu protocol?
shabbir
[email protected]

 

danw

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• Jun 26, 2010

• #2

I doubt there is a list. Modbus is very often an option on PLC's, not a standard.

The Honeywell HC-900 is a PAC (Process Automation Controller) that talks Modbus RTU over either RS232 or RS-485 as a standard feature.

If you manage to compile a list, why not post it here?

 

bernie_carlton

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• Jun 26, 2010

• #3

The AutimationDirect PLCs have Modbus as an available protocol.

 

GeoffC

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• Jun 27, 2010

• #4

And of course all the Schneider plcs. M340 Quantum Premium and Twido

 

bits'bytes

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• Jun 27, 2010

• #5

Hello,
also B&R is supporting Modbus RTU protocol via function blocks.

--
http://www.br-automation.com/cps/rde/xchg/br-productcatalogue/hs.xsl/products_5300_ENG_HTML.htm

and

http://www.br-automation.com/cps/rde/xchg/br-productcatalogue/hs.xsl/products_151765_ENG_HTML.htm
--

 

thetech

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• Jun 27, 2010

• #6

I know these units support modbus on the serial line becasue I did a project with one. Work great.

http://www.automationdirect.com/adc/Shopping/Catalog/Programmable_Controllers

The Click series.

And you don't need any add on cards the cpu comes with I/O and 2 or 3 serial com ports.

 

Last edited: Jun 27, 2010

Karsten

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• Jun 27, 2010

• #7

Just curious. Why do you want a list???

Modbus is probably the most used PLC communication protocol. Most PLCs either has it as standard or via communication cards.

 

yangguang04

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shandong

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• Jun 28, 2010

• #8

various company，various modbus protocol。
it's almost every plc having its own protocol

 

Tom Jenkins

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• Jun 28, 2010

• #9

yangguang04 said:

it's almost every plc having its own protocol

Click to expand...

Actually, almost every PLC manufacturer DOES have its own protocol. Some even have several protocols for various models. However, if there is a single protocol that is available on almost all PLC, VFD, and other instrumentation brands it is Modbus RTU.

 

diat150

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• Jun 28, 2010

• #10

both ge versamax and ab micrologix line support modbus over rs232. siemens has it also but it doesnt seem to be as robust as ge and ab(at least in my experience).