Modbus Tcp; General; Addressing - Siemens SENTRON 3WA System Manual

Modbus TCP

5.1

General

The COM190 communication module supports the Modbus TCP protocol of the Modbus
Organization, described in the following specifications:
• Modbus Application Protocol V1.1b3
• Modbus Messaging Implementation Guide V1.0b
You can find more information on the Internet (www.modbus.org).
5.2

Addressing

With Modbus TCP, the COM190 module is addressed via its IP address.
The COM190 has a data point that contains the communication parameters for access via
TCP/IP (IPv4 suite).
Read and write access
Read access to the data point takes place as follows:
• For the COM190 with role A, via Modbus register number 42009 (hex: 0xA419)
• For the COM190 with role B, via Modbus register number 43009 (hex: 0xA801)
Write access to the IPv4 suite takes place via a command with Modbus function code 16
(hex: 0x10):
• For the COM190 with role A, via Modbus register number 42900 (hex: 0xA794)
• For the COM190 with role B, via Modbus register number 43900 (hex: 0xAB7C)
Modbus TCP port
The default TCP port for a Modbus TCP server is 502. The COM190 module has a data point
"Modbus TCP port" that is configured as 502 in the as-delivered state.
It is possible to change this value. You can find more information in Chapter Configurable
Modbus TCP port (Page 43).
3WA Air Circuit Breaker Communication
System Manual, 11/2021, 92310000004-02
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