Using the Modbus Master Protocol Library (v1.2). With the Modbus Master Protocol instructions, you can configure the S7-200 to act as a Modbus RTU master device and communicate to one or more Modbus slave devices. Library) and the Modbus slave devices. Caution: Interconnecting equipment with different reference potentials can cause. Is there similar library for modbus via RS485 with parameter for pin. I have a Siemens S7 -200 PLC that I would like to test using ModBus RTU but.

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. 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. To search the site, enter your search terms in the box labeled 'search the site' and hit Enter.

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