Omron MX2 Series User Manual page 452

8 Communications Functions
Slave Address
A slave address is a serial number from 1 to 247 set in advance for each inverter (slave). (Only the
inverter that matches the slave address specified in the query will capture that query.)
⚫ Simultaneous broadcast to up to five groups
Set the slave address to 0 to perform broadcasting (simultaneous broadcast).
In a broadcast, all slaves receive data, but they return no response to it.
Moreover, during a broadcast, this inverter cannot perform data read or loop-back operation.
Although the Modbus specifications define the slave addresses between 1 to 247, using the slave
addresses 250 to 254 on the master side enables you to perform simultaneous broadcasting by
group. (In this case, the slaves return no response.)
Please note that this function is enabled for write commands (function code: 05 hex, 06 hex, 0F hex,
and 10 hex) only.
Slave address
250 (FA hex)
251 (FB hex)
252 (FC hex)
253 (FD hex)
254 (FE hex)
Function Code
A function code specifies the function to be performed by the target inverter(s).
The supported function codes are as shown in the table below.
⚫ Function code
Function code
01 hex
03 hex
05 hex
06 hex
08 hex
0F hex
10 hex
17 hex
Data
A message sends data related the function code.
The data transmission format differs depending on the function code.
Among the data used in Modbus communication, the 3G3MX2 Series supports the following data types.
Data name
Coil
Holding register
8 - 8
Simultaneous broadcast to slave addresses 01 to 09
Simultaneous broadcast to slave addresses 10 to 19
Simultaneous broadcast to slave addresses 20 to 29
Simultaneous broadcast to slave addresses 30 to 39
Simultaneous broadcast to slave addresses 40 to 247
Function
Read Coil Status
Read from Holding Register
Write to Coil
Write to Holding Register
Loop-back Test
Write to Multiple Coils
Write to Multiple Holding Registers
Read/Write from/to Multiple
Holding Registers
Binary data (1 bit) that supports read/write operation
16-bit data that supports read/write operation
Multi-function Compact Inverter 3G3MX2-EV2 User's Manual (I666-E1)
Recipient
Maximum number of
Maximum number of data per
data bytes per
message
4 32 coils (in bits)
32 16 registers (in bytes)
2 1 coil (in bits)
2 1 register (in bytes)
−
4 32 coils (in bits)
32 16 registers (in bytes)
16 registers each for read/write
32 each for read/write
operation
operation (in bytes)
Description
message
−