Function Code Fc6 (Write Single Register); Table 106: Request Of Function Code Fc6; Table 107: Response Of Function Code Fc6; Table 108: Exception Of Function Code Fc6 - WAGO -I/O-SYSTEM 750 Manual

236 Fieldbus Communication
12.2.3.6

Function Code FC6 (Write Single Register)

This function writes the value of one single output register to a slave device in
word format.
Request
The request specifies the reference number (register address) of the first output
word to be written. The value to be written is specified in the "Register Value"
field. The reference number of the request is zero based; therefore, the first
register starts at address 0.
Example: Write a value of 0x1234 to the second output register

Table 106: Request of Function Code FC6

Byte
Byte 0, 1
Byte 2, 3
Byte 4, 5
Byte 6
Byte 7
Byte 8, 9
Byte 10, 11
Response
The reply is an echo of the inquiry.

Table 107: Response of Function Code FC6

Byte
...
Byte 7
Byte 8, 9
Byte 10, 11
Exception

Table 108: Exception of Function Code FC6

Byte
...
Byte 7
Byte 8
Manual
1.5.0
750-882 Media Redundancy ETHERNET Controller
Field name
Transaction identifier
Protocol identifier
Length field
Unit identifier
MODBUS function code
Reference number
Register value
Field name
MODBUS function code
Reference number
Register value
Field name
MODBUS function code
Exception code
WAGO-I/O-SYSTEM 750
Example
0x0000
0x0000
0x0006
0x01 not used
0x06
0x0001
0x1234
Example
0x06
0x0001
0x1234
Example
0x85
0x01 or 0x02