Omron 3G3MX2 User Manual page 308

6-4 Modbus Communication (Modbus-RTU) Protocol
Data read or loop-back cannot be performed while broadcasting.
Although slave addresses 1 to 247 are used under the Modbus specification, the master can
use any of slave addresses 250 to 254 to broadcast to each group. (The slaves do not return
a response.)
Note that this function is effective only with write commands (05h, 06h, 0Fh and 10h).
Parameter No.
Use a Parameter No. to specify the function to be executed by the Inverter.
Supported Parameter Nos. are shown below.
Parameter No.
Parameter No.
6
Data
Send data relating to a Parameter No.
The data transmission format varies depending on the Parameter No.
The 3G3MX2 Series supports the data types specified below, among the types used in
Modbus communication (Modbus-RTU).
Coil
Holding register
6-5
Slave address
250 (FAh)
251 (FBh)
252 (FCh)
253 (FDh)
254 (FEh)
Function
01h Read the status of a coil
Read the content of a holding
03h
register
05h Write into a coil
06h Write into a holding register
08h Loop-back test
0Fh Write into multiple coils
10h Write into multiple registers
Read from or write into multiple
17h
holding resisters
Data name
Binary data (1 bit) that can be read or written
16-bit data that can be read or written
Recipient
Broadcast it to slave addresses 01 to 09.
Broadcast it to slave addresses 10 to 19.
Broadcast it to slave addresses 20 to 29.
Broadcast it to slave addresses 30 to 39.
Broadcast it to slave addresses 40 to 247.
Maximum number
of data bytes
in 1 message
4
32
2
2
−
4
32
32/32
Description
SYSDRIVE MX2 Series USER'S MANUAL (3G3MX2-A@@@@)
Maximum data number in
1 message
32 coils (in bit)
16 registers (in byte)
1 coil (in bit)
1 register (in byte)
−
32 coils (in bit)
16 registers (in byte)
16/16 registers (in byte)