Compressed Single-Word Registers - Omron MX2 Series User Manual

8 Communications Functions
Precautions for Correct Use
• The Modbus mapping function settings are reflected on not only Modbus communication, but
also USB communications and communications option units.
Set and use the USB communications and communications option units as follows.
When using CX-Drive: When the CX-Drive is used to read/write parameters, be sure to
When using communi-
cations option units:
• If the same address is set in the Modbus Mapping External Register 1 to 10 (P201 to P210),
the inverter will return an exception response with the exception code "32 hex" attached to
the communications command.
• If an address that does not exist in the internal Modbus register or double-word data address
is set in the Modbus Mapping Internal Register 1 to 10 (P301 to P310), the inverter will return
an exception response with the exception code "31 hex" or "32 hex" attached to the commu-
nications command.
• Be sure to set the Modbus Mapping External Register Type 1 to 10 (P211 to P220) and Mod-
bus Mapping Scaling 1 to 10 (P221 to P230) correctly. After setting these parameters, check
that data values are set as intended.
Note that the inverter does not perform checks other than the upper and lower limit checks
and operates according to settings even if they are incorrect.
8-7-3

Compressed Single-word Registers

The Modbus mapping function is intended for 16-bit single-word data only and does not support dou-
ble-word data and coils. Therefore, the main information with double-word data is compressed into sin-
gle-word data to be used in the Modbus mapping function. Also, the main coils with single-word data
are provided.
For compressed single-word registers, refer to the list below.
Modbus
Register
register
No.
spec. No
1E21 hex 1E20 hex Output Frequency Monitor
1E22 hex 1E21 hex
1E23 hex 1E22 hex
1E24 hex 1E23 hex Real Frequency Monitor
1E25 hex 1E24 hex Fault Monitor 1 Frequency
1F31 hex 1F30 hex
1F32 hex 1F31 hex 1st Acceleration Time 1
8 - 26
set in advance the Modbus Mapping Function Selection (P200) to
00 (Standard Modbus address).
If the Modbus Mapping Function Selection (P200) is set to 01
(Modbus mapping enabled), the operation is performed for the set
address. Therefore the data is not read/written from/to the
intended parameter.
Be sure to set the Modbus Mapping Function Selection (P200) to
00 (Standard Modbus address). Otherwise, the internal process
cannot be performed normally between the inverter and communi-
cations option unit.
Function name
PID Feedback Value
Monitor
Output Frequency Monitor
(After conversion)
Output Frequency Setting/
Monitor
Multi-function Compact Inverter 3G3MX2-V1 User's Manual (I585-E1)
Parameter
R/W Monitor or setting data
No.
d001 R 0 to 40000
d004 R 0 to 65535
d007 R 0 to 65535
−32768 to 32767
d008 R
d081 R 0 to 40000
0/Starting frequency to
F001 R/W
Maximum frequency
F002 R/W 0 to 65535
Data
resolu-
tion
0.01
[Hz]
0.01
0.01
0.01
[Hz]
0.01
[Hz]
0.01
[Hz]
0.01 [s]