I guess you are looking for a Protocol convertor from PROFIBUS-DP to MODBUS or from PPI to MODBUS. Unfortunately this requires an extra piece of equipment, another card, and it is not easy to find it.

Its a programm you can download from google or somewhere else, and to simulate modbus master slave read write function and parameters. Google and write down modscan and find a proper download link. This is a restriction for the Modbus Slave Protocol instructions. The points are not forced and the program can overwrite the values written by the Modbus request. 16 Write multiple holding registers. Function 16 writes multiple holding registers to the V memory of the S7-200. There can be up to 120 words written in one request.

I know Telvent is working on a Protocol convertor from MODBUS to PROFIBUS but they convert in the PROFIBUS master, not in the slave, anyway it will be easier in the slave. I have no idea about the other port of S7-200 PPI, but I think this will be even more difficult. Tell about final solution in the forum please. Hi, With the 'MicroWin add-on command library V1.1' you can directly communicate with the S7-200 on a Modbus RTU system. See ID 12330145 on WWW4.AD.SIEMENS.DE (search with search on that ID).

In ID 11859930 'S7-200 Micro-PLC Optional Software Packages' is the above Library for the S7-200 with the ordernumbers. The PPI port of the S7-200 = RS485 and may directly used for the Modbus communication. The new libraries installed with STEP 7-Micro/WIN32 Version 3.2 are supported on all 22x series CPUs, (CPU221, CPU222, CPU224, CPU226 and CPU226XM at present). The 21x series CPU's do not support the Add-On Instruction Library. Best Regards, Lowiek. You have clicked on the '?' Button for search help.

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Hello David; I always presumed (not to say 'assumed') that Siemens did not support Modbus/TCP. Your post made me look a little deeper, and here is what I found on different Siemens webpages: Siemens websites on Modbus/TCP options: Flyer: Manual: You can obtain further information on this topic at the following address: Siemens AG Industrial Solutions & Services Information Technology Plant Solutions Werner-von-Siemens-Str. 60 D-91052 Erlangen Tel.: +49 91 31 7-46111 Fax +49 91 31 7-44757 E-mail: it4industry@siemens.com Internet: If you are located in Amwerica, note that you might have trouble getting pricing and delivery info from your local rep; divisdion of certain Siemens markets and products may be strange to understand for us laymen. In that case you would need to deal directly with the European providers, possibly using a Simatic Card (prepaid buying cards used for certain transactions over the web). Thanks for the new comm. Oppertunities, Daniel Chartier. Drdepth serial number search.