Modbus Mapping Function - Hitachi WJ200-001S Instruction Manual

Modbus Mapping function

With this function, the register numbers that you have been using and any Hitachi register numbers can be
linked together.
Although the usages of Modbus register numbers are different from instrument to instrument, those register
numbers can be handled in unified way by using Mapping function. EX) You can replace a slave instrument that
you have been using with a Hitachi inverter (a slave instrument) without changing, for example, an operation
frequency configuration by Modbus of a master instrument.
You can read and write Hitachi register numbers by accessing the register numbers you would like to use, by
linking together the register numbers you are going to use (external register number) and Hitachi register
numbers (internal register numbers). Scaling (multiplication/division) and format (with/without sign) can be
designated when making a link with an external register and an internal register. The following shows examples.
(All the explanations use Big Endian.)
Func. Code
P200
P201 – P210
P211 – P220
P221 – P230
P301 – P310
Name
Register Mapping
setting
External register
Selection
Format of external
register
Scaling data
Select Internal
register
Range
Standard Mapping function
00
disabled (default)
Modbus Mapping function
01
enabled
0000h （ d efault ） is deemed as
0000h - FFFFh
not setting
Unsigned 16-bit data
00
(Word data)
01 Signed 16-bit data
0.001-65.535 1.000(default)
0000h （ d efault ） is deemed as
0000h - FFFFh
not setting
Ver.3− − − − 23
Description