Siemens s7-300 modbus

engineerjaber · Oct 6, 2013

Hello Guys,

I'm working on a project in which i have to communicate my own plc with A siemens S7-300 plc by modbus protocol ?

1- What should i first figure out ??

2- Can I communicate serially, TCP/IP ??

3- What must i have to gain this task ??

Thanks

marcius · Oct 6, 2013

Siemens has Open modbus(TCP, port 502) library. Communication via CP434 or CPU integrated profinet interface is possible.
Open modbus library is optional and it is not cheap. Costs ~1500€ where I am.

Tom Jenkins · Oct 6, 2013

As general rule it is more cost effective to use a communications bridge between the two systems. They will read the info from the Siemens network and make it available to the Modbus network. There are many brands available - here is one:
http://www.rtaautomation.com/products/

KalleOlsen · Oct 6, 2013

engineerjaber said:
Hello Guys,

I'm working on a project in which i have to communicate my own plc with A siemens S7-300 plc by modbus protocol ?

1- What should i first figure out ??

2- Can I communicate serially, TCP/IP ??

3- What must i have to gain this task ??

Thanks

Which make is 'my own plc'?

If it also is a S7300, 400 or 1200, you should avoid Modbus and use S7 protocol with PUT/GET instead.

Kalle

Siemens s7-300 modbus

engineerjaber

Member

marcius

Member

Tom Jenkins

Lifetime Supporting Member

KalleOlsen

Member

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