Operation
7.7 Communication via Modbus TCP
SINAMICS DCP
Operating Instructions, 09/2019, A5E34382853K
275
7.7 Communication via Modbus TCP
7.7.1 Overview
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 DCP.
Modbus functionality
Process data and parameters are accessed via the Modbus register.
● Process data: 40100 - 40119
A maximum of 10 process data (PZD) can be exchanged.
● Drive data: 40300 - 40499
● All parameters via DS47: 40601 - 40722
Modbus TCP always provides a basic Ethernet functionality:
● Commissioning access for STARTER with S7 protocol
● DCP (Discovery and Configuration Protocol) to set the IP address etc.
● SNMP for identification
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