In the Modbus Mapping Endian Selection (H396), set the endian you want to use.
The Modbus Mapping Endian Selection H396 setting is enabled independent of the Modbus Mapping
Function Selection (H355) setting.
Parameter No. Function name Data Default data Unit
H396
Modbus Mapping Endian
Selection
0: Big endian
1: Little endian
2: Special endian
0 -
Byte order of single-word data
• Relationship between single-word data bits and bytes
Bit 8 to 15 7 to 0
Byte MSB byte LSB byte
• Order of data during Modbus communication
Send/Receive byte or-
der
Big endian Little endian Special endian
1 MSB byte LSB byte MSB byte
2 LSB byte MSB byte LSB byte
Byte order of double-word data
• Relationship between double-word data bits and bytes
Bit 24 to 31 16 to 23 8 to 15 7 to 0
Byte MSB byte Data 1 Data 2 LSB byte
• Order of data during Modbus communication
Send/Receive byte or-
der
Big endian Little endian Special endian
1 MSB byte LSB byte Data 2
2 Data 1 Data 2 LSB byte
3 Data 2 Data 1 MSB byte
4 LSB byte MSB byte Data 1
Executable function codes
This function is enabled only for the function codes listed below.
Other function codes will be processed in big endian.
Function code
03 hex Read from multiple holding registers
06 hex Write to a holding register
10 hex Write to multiple holding registers
17 hex Read/Write from/to multiple holding registers
8 Communications Functions
8-26
M1 Series Standard Type User's Manual (I669)
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