Siemens and Modbus TCP

[Bryll]

I have a 315 cpu with a CM343-1 communication module for ethernet communication, that now also shall collect data from another system. The thing is that we now shall collect the recently added units data by using Modbus TCP. That's no problem to do with the 315 cpu, as long as you buy the silly expensive licens for it. I know that it's very easy to exchange data via the ethernet cable by connecting the 315 to a 1200 system (done it before). Since I can buy almost a box of 1200 systems for the same money they ask for a 315 Modbus TCP licens, do I have some questions. The questions are: Is the 1200 capable of Modbus TCP communication ? Do I need a silly expensive licens for that one too ?

[malc cope]

The S7-1200 does have MODBUS TCP blocks included for Modbus coms over profinet, MB_Client & MB_Server.

[Bryll]

Thanks, the customer will be happy now. The price for the licens is roughly ten times the price for a small 1200 system and a switch.

[Groo]

You can also get Profibus to Modbus converters. A couple of examples http://www.gedigitalenergy.com/multilin/catalog/p485.htm http://www.anybus.com/products/products.asp?PID=462&ProdType=Anybus%20X-gateway Edited January 19, 2014 by Groo

[Bryll]

Yes, I looked at that solution too. I will put in a 1200 to do the job, the smallest one I can find. Thanks to all for your help

[mohssen]

Hi Bryll, S7 can talk Modbus TCP as a client. You can see below examples: http://msx-box.blogspirit.com/files/modbusTC_read_8dig_inp.2.zip http://msx-box.blogspirit.com/files/modbusTC_set8_dig_out.2.zip However, you can use Profibus to Modbus converters. Below are two converters you can use: http://www.icpdas-usa.com/gw_7553.html?r=mohsen http://www.icpdas-usa.com/gw_7552.html?r=mohsen Good Luck :)

[Bryll]

The customer decided that we use Modbus RTU communication and the end customer installed an anybus converter RTU<->TCP converter. When commissioning the system the end customer decided to skip the communication part to their DCS. All the HW and the expensive RTU driver dongle for nothing, well they have it installed, but it's not for any use (at the moment).