124 SI-Ethernet User Guide
Issue: 1
7.2.8 FC06 – Write single register
This function code writes a single 16-bit value to a register. The normal response is an
echo of the request (unless an exception occurs) returned after the parameter has
been written.
The register address can be a 32-bit parameter address but only the lower 16 bits of
the value will be written.
Master request data Slave response data
Example
To write the value 12345 to drive parameter 0.20.001 (transaction ID = 42) using
standard addressing:
Master request data Slave response data
Byte Description Byte Description
7 Function code 0x06 7 Function code 0x06
8
Start register address
(MSB)
8
Start register address
(MSB)
9
Start register address
(LSB)
9
Start register address
(LSB)
10
Register data
(MSB)
10
Register data
(MSB)
11
Register data
(LSB)
11
Register data
(LSB)
Byte Hex value Description Byte Hex value Description
0-1 00 2A
Transaction ID
(42)
0-1 00 2A
Transaction ID
(42)
2-3 00 00
Protocol ID
(0=TCP/IP)
2-3 00 00
Protocol ID
(0=TCP/IP)
4-5 00 06
Length
(Bytes=6)
4-5 00 06
Length
(Bytes=6)
6FF
Unit identifier
(FF= Drive)
6FF
Unit identifier
(FF= Drive)
706
Function code
(06)
706
Function code
(6)
8-9 07 D0
Start register
(20.000)
8-9 07 D0
Start register
(20.000)
10-11 30 39
Register data
(12345)
10-11 30 39
Register data
(12345)
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