side. When this is set to “0: Unsigned,” the input value is limited to -32768 to 32767, and when set to
“1: Signed,” the input value is limited to 0 to 65535.
• In the Modbus Mapping 1 Scaling to Modbus Mapping 10 Scaling (H376 to H385), set the scale fac-
tor for receiving data from external communications and capturing it into the inverter. Conversely,
each of these settings provides a subtraction factor when internal data is output to external commu-
nications.
•
In the Modbus Mapping 1 Internal Register to Modbus Mapping 10 Internal Register (H386 to H395),
set the Modbus register address inside the inverter to process commands from external communica-
tions.
For the Modbus register addresses of the inverter, refer to 8-9 Modbus Communication Data Lists
on page 8-34.
• The Modbus mapping function is intended for 16-bit single-word and double-word data. It does not
support coils. For double-word data writing, refer to 8-7-3 Writing to Double-word Data on page
8-25.
• After setting or changing the Modbus mapping function, be sure to cycle the inverter power supply.
Until the power supply is cycled, the inverter does not apply the changes to the Modbus mapping
function settings.
• If the Modbus communication function is executed with any erroneous Modbus mapping function
setting, the inverter will return an exception response to the command. In this case, check the ex-
ception code for the exception response.
For details on exception codes, refer to 8-7-4 Troubleshooting for Modbus Mapping Function on
page 8-25.
Parameter No. Function name Data
Default
data
Unit
H355
Modbus Mapping Function
Selection
0: Standard
1: Free mapping
0 -
H356 to H365
Modbus Mapping 1 External
Register to Modbus Map-
ping 10 External Register
0000 to FFFF Hex 0000 hex -
H366 to H375
Modbus Mapping 1 External
Register Sign to Modbus
Mapping 10 External Regis-
ter Sign
0: Unsigned
1: Signed
0 -
H376 to H385
Modbus Mapping 1 Scaling
to Modbus Mapping 10
Scaling
0.001 to 65.53
*1
1.000 -
H386 to H395
Modbus Mapping 1 Internal
Register to Modbus Map-
ping 10 Internal Register
0000 to FFFF Hex 0000 hex -
H396
Modbus Mapping Endian
Selection
0: Big endian
1: Little endian
2: Special endian
0 -
*1. H376 to H385 can only be displayed and set by the Digital Operator to within a range of 0.001 to 65.53.
0.001 to 65.535 can only be set when using communications.
8 Communications Functions
8-24
M1 Series Standard Type User's Manual (I669)
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