from the Industrial Modbus department...
Modbus RTU Genset Cummins
Communications systems and equipment. topic
Posted by Bao Le on 16 November, 2010 - 10:33 pm
Dear All,

I want to communicate between PLC (Omron, Siemens, ...) and PCC2300 (Cummins)

Can you help me how to communicate ?

PLease help me

Thanks so much

Posted by Helen on 17 November, 2010 - 7:52 am

Do you know the registry map for this device? If yes, you can use any modbus data logger software.


Posted by Eric Ratliff on 17 November, 2010 - 1:48 pm
If your PLC has a Modbus RTU master function, just use that. As Helen says, you do need to know the address map of the Cummins. You should also know baud rate, data bits, parity, and stop bits of the serial line. Presumably the serial line is RS485, but RS232 might also be used.

Posted by Patrick Lansdorf on 18 November, 2010 - 2:09 am

As previously said if the PLC has a serial port, it can be used to read/write from/to the genset, using Modbus RTU protocol.

Normally, there is no serial port, default, on a Siemens PLC (300-400 series). Siemens has CP341/CP441, which is an option card that has a serial port that can do Modbus RTU.

Still, I would suggest a gateway since it is a less expensive solution.

I work for HMS and we have a wide rage of suitable gateways.

If you have any questions let me know.

Patrick Lansdorf

Posted by Nilesh J Suryavanshi on 23 November, 2010 - 4:24 am
You can Communicate using Modbus RTU or Modbus TCPIP/ or simple OPC server. Using OPC server you will able to communicate will all PLCs.

: Nilesh (sjnilesh [at]

Posted by Valerie Harding on 29 November, 2010 - 12:41 pm
The KEPServerEX v5 OPC and Communications Server can help you in communicating to a multitude of PLCs and is capable to move to automation platforms (new and old) while delivering legacy compatibility if needed. You can try it out for free at


Posted by Valerie Harding on 29 November, 2010 - 1:04 pm
In regards to your need to communication between PLCs (Omron, Siemens, ...) and PCC2300(Cummins)

Do you also want to be able to map memory locations into different devices? ( It sounds like to you want collect and manipulate data from a variety of applications and devices by communicating in the most easy, open and effective way, right?

Best of luck,
Val of REC

Posted by Wassim Daoud on 30 November, 2010 - 10:45 am
I suggest just like the others said earlier, OPC seems to be a good choice here. You will need an OPC Server that will communicate between all PLCs (Omron, Siemens...). Here is a Universal OPC Server for all your PLCs and Modbus RTUs:

Hopefully this answers your question

Wassim Daoud
Global Solutions Architect

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