Chapter 11 RS485 Communication
11-3-1
11.3 Modbus Mapping Function
11.3.1 Setting Modbus Mapping Function
ï‚Ÿ How to replace the inverter without changing the communication program of the host PC or
PLC...etc?
ï‚Ÿ Modbus mapping function allows the register number, data type, and data scale specified by the
communication command from an external control equipment to be converted to any register
number or data scale in WJ-C1 inverter. This makes it possible to replace the inverter without
changing the communication program on the external control equipment side.
ï‚Ÿ The register number and data of up to 10 registers can be converted.
ï‚Ÿ If the external register number is already used as the internal register number of the inverter,
Modbus mapping setting takes precedence. When accessing the internal registers of the
disabled inverters, perform Modbus mapping settings separately so that they are accessed
indirectly.
ï‚Ÿ The "2 register length parameter" cannot be set to the internal address with some exceptions.
For details, refer to "Modbus Mapping Configuration Process" in this section.
Resister mapping selection
Modbus mapping function disable
Modbus mapping function enable
External register 1 to 10
Set the register number to be used in
communication programs of external control
equipment, etc.
0000h is judged as not set.
External register 1 to 10 format
The data type of the external register is
unsigned word data.
The data type of the external register is signed
word data.
External register 1 to 10
scaling
The data specified from the external control
equipment × this setting value = Inverter
internal data.
Write: "External data × This setting" is written
to the internal register.
Read: "Internal data / This setting" is read as
external data
Internal register 1 to 10
Set Modbus register number of the inverter.
0000h is judged as not set.
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