Advantech ADAM-5560 user manual Modbus/TCP Server Functions, Modbus Address Mapping

4.4Modbus/TCP Server Functions

ADAM-5560 Series Controller supports Modbus/TCP server function for connecting to HMI/SCADA software. The Modbus/TCP server function is supported by using Ethernet port of ADAM-5560 Series Controller.

4.4.1Modbus Address Mapping

ADAM-5560 Series Controller reserves 16K Bytes memory space for Modbus function. The memory block can store user’s data and exchange it through Modbus protocol. The unit in Modbus 4X registers is Word so there are totally 8K Words available.

The Modbus address is defined from 42001 to 49999. In order to exchange the data through Modbus, users need to move the data onto this memory block by setting the memory address in “I/O Address” field manually. The memory address of this memory block is defined from mw3.0 to mw3.15996. The mapping table of I/O Address and Modbus Address is as following table.

I/O Address	Modbus Address
%mw3.0	42001
%mw3.2	42002
%mw3.4	42003
...

Since unit of mw3.0 is Byte, users need to map the I/O Address and Modbus Address as following.

For Bool data type:

	I/O Address	Modbus Address	Length
Data 1	mw3.0.0	02001	1 Bit
Data 2	mw3.0.1	02002	1 Bit
Data 3	mw3.0.2	02003	1 Bit

For Byte and Word data type:

	I/O Address	Modbus Address	Length
Data 1	mw3.0+ mw3.1	42001	2 Bytes
Data 2	mw3.2+mw3.3	42002	2 Bytes
Data 3	mw3.4+mw3.5	42003	2 Bytes

For Dword and Real data type:

	I/O Address	Modbus Address	Length
Data 1	mw3.0+mw3.1+mw3.2+mw3.3	42001+42002	4 Bytes
Data 2	mw3.4+mw3.5+mw3.6+mw3.7	42003+42004	4 Bytes
Data 3	mw3.8+mw3.9+mw3.10+mw3.11	42005+42006	4 Bytes

Chapter 4 Modbus Functions

107 ADAM-5560 Series User Manual