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With the Modbus Master Protocol instructions, you can configure the S7-200 to act as a. Master device and communicate to one or more Modbus slave devices. Apr 02, 2017 The S7-200 Modbus Protocol is for slave status only. If your inverter is a siemens MM420 or 440, you can use the USS protocol from the same library to.
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.
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