Hitachi WJ200-001S Instruction Manual page 575

Ver.3− − − − 66
2) In the case of 32-bit registers (=two consecutive Holding registers given the same parameter name)
Example ） 3 2-bit data = 01020304h
Original sending data
Byte data (High byte of the high register)
Byte data (Low byte of the high register)
Byte data (High byte of the low register)
Byte data (Low byte of the low register)
Table: Endian of 32-bit data
No
Byte data (High byte of the high
1
Byte data (Low byte of the high
2
Byte data (High byte of the low
3
Byte data (Low byte of the low
4
In the case of Big Endian, the "High byte of the high register" is stored first. Other data follow in the order
of Number shown in the above table's each column, so the "Low byte of the low register" is stored last.
In the case of Little Endian, the "Low byte of the low register" is stored first. Other data follow in reverse
order of Number shown in the above table's each column, so "High byte of the high register" is stored last.
In the case of Special Endian, those data are stored in an order to show next,
the "High byte of the low register",
the "Low byte of the low register",
the "High byte of the high register",
the "Low byte of the high register".
Note) Special Endian is designed for Hitachi PLC.
Item
register)
register)
register)
register)
01
02
03
04
Big endian Little endian
01 04
02 03
03 02
04 01
Special endian
03
04
01
02