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ioLogik 4000
Modbus Address Mapping
Finding a Modbus Address for I/O Channels
The Modbus Address for each I/O channel is arranged dynamically by the Network Adapter according to the slot
sequence and the type of I/O module. Changing Ethernet Network Adapter to RS-485 or RS-232 Network
Adapters will not change the Modbus address mapping.
The Modbus Address mapping for I/O module can be found on "Modbus Address" tab.
There are three columns for Modbus Address. According to the Modbus standard, there are two methods to
access I/O channel. One is access by Register, and the other is by Coil. Each I/O channel can be accessed via
the Register or Coil method.
For more information, refer to the Modbus protocol specifications.
Exporting Modbus Address Settings
Modbus Addresses for I/O channels are required when you want to access the I/O status via SCADA software.
However, it's not easy to memorize all of the addresses for each I/O channel. for this reason, ioAdmin allows
you to export a text file containing the installed I/O modules and their Modbus addresses. The following
example is an exported system configuration file.
3. Modbus address table
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Slot No.
Channel No.
01
00
01
01
01
02
01
03
02
00
02
01
03
00
03
01
03
02
03
03
03
04
I/O type
Modbus Addr.(WORD)
Input
0x0000/0x00
Input
0x0001/0x00
Input
0x0002/0x00
Input
0x0003/0x00
Input
0x0004/0x00
Input
0x0005/0x00
Input
0x0006/0x00
Input
0x0006/0x01
Input
0x0006/0x02
Inupt
0x0006/0x03
Input
0x0006/0x04
3-19
Getting Started
Modbus Addr.(BIT)
I/O Data Lenghth
0x0000
0x0010
0x0010
0x0010
0x0020
0x0010
0x0030
0x0010
0x0040
0x0010
0x0050
0x0010
0x0060
0x0001
0x0061
0x0001
0x0062
0x0001
0x0063
0x0001
0x0064
0x0001
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