Siemens S7 300 PLC Labview Communication

Hi.I am using a CP-343 communications processor
to connect the S7 300 to industrial ethernet. Now can I commnicate
directly from Labview to the PLC?We are plan to use ethernet communication (our TCP VI's).
Which type of command we need to ues. whether we need to form a MODBUS protocol command.
Thanks
Siva

sivaramkumar wrote:
Hi.I am using a CP-343 communications processor
to connect the S7 300 to industrial ethernet. Now can I commnicate
directly from Labview to the PLC?We are plan to use ethernet communication (our TCP VI's).
Which type of command we need to ues. whether we need to form a MODBUS protocol command.
Siemens S7 supports all kinds of protocols. Some are built in from start and are usually Siemens specific protocols whose specs are not always easy to come by, others can be purchased and installed on the communication processor seperately such as Modbus. Once you have the Modbus library installed on your S7 you can simply use the Modbus VIs downloadable from the NI site to communicate with your S7 datablocks.
It is a strict IO access meaning you can read and write IO registers and memory datablocks, but not interfere with the actual programm on the S7 in other ways.
Using Modbus is simply and hard at the same time, since Modbus uses various datatypes with different address ranges that are mapped in some way to the items in the target hardware. This mapping can be tedious to work out correctly since the documentation of devices is sometimes quite a bit unclear about how exactly that has been done by the manufacturer.
There are many other Ethernet protocols that are available or can be installed on a S7 such as Profibus Ethernet, EtherCat, Industrial Ethernet, etc. Most of these while technically possible to be implemented on top of the native TCP LabVIEW nodes are rather complicated and therefore anything but trivial to create a VI library for.
Your best bet really is to either use Modbus or an OPC Server that implements the native access to the PLC.
Rolf Kalbermatter
Message Edited by rolfk on 03-12-2009 09:07 AM
Rolf Kalbermatter
CIT Engineering Netherlands
a division of Test & Measurement Solutions

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You should open the Example Finder (Help -> Find Examples) and take a look at the serial communication examples. They should be able to do what you want.
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Solved!
Go to Solution.

now this is a problem the PLC S7300 does not support some functions of communication when you want to make a simulation may not be accessible from OPC Server, this by PROFIBUS Siemens USB / MPI + PLC S7300/400 protocol adapter cord
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How can I write to a Siemens S7-300 PLC tag from OPC Server.vbai page by using a Knob object ?

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Ran across this similar message which points to this KB article which you may want to look at.

Siemens S7 300 PLC and Labview Communication

Hi,
I am attempting to communicate between Labview 7 and a Siemens S7 300 (CPU 314) PLC. I would prefer the communication to be over Ethernet or RS 232. Could you help me out with this implementation and let me know what additional hardware/software I may require for doing this.
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Shameek wrote:
I am using a CP-343 communications processor to connect the S7 300 to industrial ethernet.
Now can I commnicate directly from Labview to the PLC?
I still havent figured out where the OPC server comes in and whether it is an option or a necessity.
Using OPC is an option.
Siemens has an the add-on ($$) library/FB that includes code for enabling Modbus communication with S7 300 CPUs. I've never used it, but info is here.
<snip>
Our solution
With its MODBUS function block (FB) and the CP343-1 and CP443-1 SIMATIC S7 communications processors, Siemens can supply a proven solution for the integration of SIMATIC automation systems into other system landscapes. This function block enables data to be exchanged easily between MODBUS-compatible devices from different manufacturers and SIMATIC S7 stations from S7-300 and S7-400 systems.
</snip>
=====================================================
Fading out. " ... J. Arthur Rank on gong."

Connection of Siemens S7-300 PLC to NI OPC Server 2012

Hi,
My name is Gevorg.
I am going to create a communication between S7-300 (CP 343-1 Lean) and NI OPC Server 2012.
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Attachments:
OPC server.png ‏64 KB
GH_CP343-1-Lean-CX10_76.pdf ‏1563 KB

https://decibel.ni.com/content/docs/DOC-38858
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Siemens S7 300 PLC Communicationnd with Labview

hi;
I'm trying to connect my PLC s300 with labview in my PC .
How can I proceed ?
what is the easiest way to do the communication knowing that I did the simulation using TCP/IP protocol with OPC server.
I have SIMATIC net station and CPU 315 2-DP
any suggestion?
I want to use OPC server with MPI can I do so ? amI supposed to add materials and what are those materials ?
Thanking in anticipation.

sivaramkumar wrote:
Hi.I am using a CP-343 communications processor
to connect the S7 300 to industrial ethernet. Now can I commnicate
directly from Labview to the PLC?We are plan to use ethernet communication (our TCP VI's).
Which type of command we need to ues. whether we need to form a MODBUS protocol command.
Siemens S7 supports all kinds of protocols. Some are built in from start and are usually Siemens specific protocols whose specs are not always easy to come by, others can be purchased and installed on the communication processor seperately such as Modbus. Once you have the Modbus library installed on your S7 you can simply use the Modbus VIs downloadable from the NI site to communicate with your S7 datablocks.
It is a strict IO access meaning you can read and write IO registers and memory datablocks, but not interfere with the actual programm on the S7 in other ways.
Using Modbus is simply and hard at the same time, since Modbus uses various datatypes with different address ranges that are mapped in some way to the items in the target hardware. This mapping can be tedious to work out correctly since the documentation of devices is sometimes quite a bit unclear about how exactly that has been done by the manufacturer.
There are many other Ethernet protocols that are available or can be installed on a S7 such as Profibus Ethernet, EtherCat, Industrial Ethernet, etc. Most of these while technically possible to be implemented on top of the native TCP LabVIEW nodes are rather complicated and therefore anything but trivial to create a VI library for.
Your best bet really is to either use Modbus or an OPC Server that implements the native access to the PLC.
Rolf Kalbermatter
Message Edited by rolfk on 03-12-2009 09:07 AM
Rolf Kalbermatter
CIT Engineering Netherlands
a division of Test & Measurement Solutions

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