Communication Via Modbus Tcp; Overview - Siemens SINAMICS S120 Function Manual

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Communication via MODBUS TCP

The Modbus protocol is a communication protocol based on a controller/device architecture.

Modbus offers three transmission modes:

● Modbus ASCII - via a serial interface

data in the ASCII code. The data throughput is lower compared to RTU.

● Modbus RTU - via a serial interface

data in the binary format. The data throughput is greater than in ASCII code.

● Modbus TCP - via Ethernet

data as TCP/IP packages. TCP port 502 is reserved for Modbus TCP.

Only transfer type "Modbus TCP" is available for SINAMICS S120.

Possible drive units:

● CU320-2 PN

● CU320-2 DP (CBE20)

● CU310-2 PN

Modbus functionality

Process data and parameters are accessed via the Modbus register.

● Process data: 40100 - 40119

● Drive data: 40300 - 40522

● All parameters via DS47: 40601 - 40722

Modbus TCP always provides a basic Ethernet functionality, which corresponds to the

functionality of Ethernet interface X127:

● Commissioning access for STARTER/Startdrive with S7 protocol

● DCP to set the IP address etc.

● SNMP for identification

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Function Manual, 11/2017, 6SL3097-4AB00-0BP5

11.4 Communication via MODBUS TCP

Communication

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