Hitachi SJ200 Series Power Supply User Manual


 
SJ200 Inverter
Appendix B
B–7
Data:
A function command is set here.
The data format used in the SJ200 series is corresponding to the Modbus data format
below.
Function code:
Specify a function you want to make the inverter execute. Function codes available to the
SJ200 series are listed below.
Error check:
Modbus-RTU uses CRC (Cyclic Redundancy Check) for error checking.
The CRC code is 16-bit data that is generated for 8-bit blocks of arbitrary length.
The CRC code is generated by a generator polynomial CRC-16 (X16+ X15+ X2+ 1).
Header and trailer (silent interval):
Latency is the time between the reception of a query from the master and transmission of
a response from the inverter.
3.5 characters (24 bits) are always required for latency time. If the latency time shorter
than 3.5 characters, the inverter returns no response.
The actual transmission latency time is the sum of silent interval (3.5 characters long)
+ C078 (transmission latency time).
Name of Data Description
Coil Binary data that can be referenced and changed (1 bit long)
Holding Register 16-bit data that can be referenced and changed
Function
Code
Function
Maximum data size
(bytes available per
message)
Maximum number of
data elements available
per message
0 1 h Read Coil Status 4 32 coils (in bits)
0 3 h Read Holding Register 4 4 registers (in bytes)
0 5 h Write in Coil 1 1 coil (in bits)
0 6 h Write in Holding Register 1 1registers (in bytes)
0 8 h Loopback Test
0 F h Write in Coils 4 32 coils (in bits)
1 0 h Write in Registers 4 4 registers (in bytes)