Siemens SINAMICS G130 - Communication Via MODBUS TCP

Operation
6.11 Communication via MODBUS TCP
Inverter chassis units
298 Operating Instructions, 07/2016, A5E00331449A
6.11
Communication via MODBUS TCP
6.11.1
Overview
The Modbus protocol is a communication protocol based on a master/slave 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.
With the Control Unit CU320-2, only transfer type "Modbus TCP" is available.
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 with S7 protocol
● DCP to set the IP address etc.
● SNMP for identification
General information about communication
Communication with Modbus TCP runs via the Ethernet interfaces:
●
X150
:
For Modbus TCP with a CU320-2 PN.
●
X1400
:
For Modbus TCP with a CU320-2 PN or a CU320-2 DP via a CBE20.
Precisely one Modbus connection can be established. A simultaneous connection via
interfaces X150 and X1400 is rejected, and is acknowledged using Alarm A08555.
However, you can use one interface for Modbus TCP, and the other as PROFINET interface.