Operation
6.12 Communication via MODBUS TCP
Converter cabinet units
Operating Instructions, 07/2016, A5E03347396A
397
6.12
Communication via MODBUS TCP
6.12.1
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
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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.
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