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#Siemens simatic s7 1200 serial
#Siemens simatic s7 1200 code

You can continue with the PROFIBUS cable to connect up to 31 additional MODBUS slaves to the master.

The CM 1241 RS485 communication modules are linked to each other using a PROFIBUS cable. By the same principle, the address of the slave to be addressed can be changed between two actions (here writing and reading), thus making it possible to exchange data with multiple slaves. Since the RS485 has a two-wire interface (half-duplex), writing and reading must be conducted consecutively.

#Siemens simatic s7 1200 code

There is alternate writing to the holding register of the slave (function code 16) and reading from the holding register of the slave (function code 03). We have taken the example of MODBUS communication between a master and a slave. We will take a sample project to describe the configuration procedure in STEP 7 (TIA Portal) V11 for communication with multiple slaves using the CM 1241 RS485.

With up to 32 slaves one after the other using the RS485 (via CM or CB 1241 RS485).

With only one slave using the CM 1241 RS232 (physical limitation).

If you select MODBUS Master, you can communicate Using the MODBUS library integrated in STEP 7 (TIA Portal) you can define each communication module as a MODBUS master or slave. You can add up to three communication modules (+ one RS485 communications board) to each PLC Siemens S7-1200 controller. The PLC Siemens SIMATIC S7-1200 enables point-to-point communication via the CPU extension with the interfaces RS485 und RS232. sebenarnya dari versi sebelumnya bisa dilakukan tetapi semuanya tidak free, sekarang di plc siemens S7-1200 sudah bisa langsung dilakukanīerikut kutipan yang di ambil dari web resmi support siemens

#Siemens simatic s7 1200 serial

PLC Siemens umumnya mengalami kesulitan dalam koneksi modbus, khusunya ke peralatan dengan modbus serial seperti power meter, protection relay dan lainnya. A MODBUS-RTU communication with PLC SIEMENS SIMATIC S7-1200?