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.

Siemens has sample programs in S7-200 tips and tricks. You can also dowload the. The 21x series CPU's do not support the Add-On Instruction Library. Best Regards. Siemens has a subroutine which will allow the S7-200 to act as a Modbus slave. You can download this from the Siemens web site.

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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Modbus Slave & Modbus Master in S7 Refer to the Modbus Serial Pack v2 zip. Project Modbus v2 Manuals for drivers and hardware Preperation Preparation. To enable the Modbus functionality of the CP cards, you must do three things: Install Point to Point software from Install Modbus Master and Slave drivers from Fit the Modbus dongle to the rear of the CP Install the driver to the CP Preperation Summary of the GOULD-MODBUS Protocol The type of data exchange between MODBUS systems is controlled by Function Codes (FCs).

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The following FCs can be used to carry out data exchange bit-by-bit: FC 01 Read coil (output) status, FC 02 Read input status, FC 05 Force single coil, FC 15 Force multiple coils. The following FCs can be used to carry out data exchange register-by-register: FC 03 Read holding registers, FC 04 Read input registers, FC 06 Preset single register, FC 16 Preset multiple registers. Gould-Modbus Summary of the GOULD-MODBUS Protocol It will save considerable time and frustration to have a good idea upfront of the mapping of Modbus data to S7 data. The Modbus slave will define the function codes to be used by virtue of the fact that specific data is held in specific Modbus registers. Function Code Modbus Address Range Access Output Coils Function Codes 01, 05, 15 Read/Write Input Coils Function Code 02 Read Only Internal Registers Function Code 04 Holding Registers Function Codes 03, 06, 16 Gould-Modbus Configure the Hardware as Modbus Slave With the software installed you can now open the Hardware Configuration and configure the CP341 in your rack. Double click the CP to open its properties and click on the Parameter button. The Point to Point configuration software will now open.