Function Code Fc16 (Write Multiple Registers); Table 115: Request Of Function Code Fc16; Table 116: Response Of Function Code Fc16; Table 117: Exception Of Function Code Fc16 - WAGO -I/O-SYSTEM 750 Manual

240 Fieldbus Communication
12.2.3.9

Function Code FC16 (Write Multiple Registers)

This function writes a sequence of registers in a slave device in word format.
Request
The Request specifies the reference number (starting register), the word count
(number of registers to write), and the register data . The data is sent as 2 bytes
per register. The registers are zero-based; therefore, the first output is at address
0.
Example: Set data in registers 0 and 1

Table 115: Request of Function Code FC16

Byte
Byte 0, 1
Byte 2, 3
Byte 4, 5
Byte 6
Byte 7
Byte 8, 9
Byte 10, 11
Byte 12
Byte 13, 14
Byte 15, 16
Response

Table 116: Response of Function Code FC16

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

Table 117: Exception of Function Code FC16

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
Word count
Byte count
Register value 1
Register value 2
Field name
MODBUS function code
Reference number
Word count
Field name
MODBUS function code
Exception code
WAGO-I/O-SYSTEM 750
Example
0x0000
0x0000
0x000B
0x01 not used
0x10
0x0000
0x0002
0x04
0x1234
0x2345
Example
0x10
0x0000
0x0002
Example
0x85
0x01 or 0x02