Hitachi SJ Series User Manual page 499

Chapter 14
14.3.3 Function codes
• Specify functions the inverter executes using function
codes.
Function code
Function Code Function
01h Reads out the state of coil.
03h Reads out the content of retention
register.
05h Writes to coil.
06h Writes to retention register.
08h Loopback test
0Fh Writes to multiple coils.
10h Writes to multiple retention registers.
17h Writes / reads out to multiple retention
registers.
14.3.4 Data
• Transmit the data related to function codes.
• The inverter corresponds to the data formats shown
below among data used in Modbus.
Data Name
Coil
Retention register
Corresponding function codes are shown below:
Max. Data Bytes Handled by
1 Message
4
32
2
2
-
4
32
32 / 32
• Transmission formats of data vary depending on function
codes.
Description
Writable/readable binary data (1 bit long)
Writable/readable 16 bits long data
14-8
RS485 Communication
Max. Number of Data
Handled by 1 Message
32 coils (bitwise)
16 registers (in bytes)
1 coil (bitwise)
1 register (in bytes)
-
32 coils (bitwise)
16 registers (in bytes)
16 / 16 registers (in bytes)