WAGO-I/O-SYSTEM 750
Fieldbus Communication 235
750-880, 750-880/025-000 ETHERNET Programmable Fieldbus Controller
Manual
Version 1.0.1
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 117: Request of Function code FC16
Byte
Field name
Example
Byte 0, 1
Transaction identifier
0x0000
Byte 2, 3
Protocol identifier
0x0000
Byte 4, 5
Length field
0x000B
Byte 6
Unit identifier
0x01 not used
Byte 7
MODBUS function code 0x10
Byte 8, 9
Reference number
0x0000
Byte 10, 11
Word count
0x0002
Byte 12
Byte count
0x04
Byte 13, 14
Register value 1
0x1234
Byte 15, 16
Register value 2
0x2345
Response
Table 118: Response of Function code FC16
Byte
Field name
Example
...
Byte 7
MODBUS function code 0x10
Byte 8, 9
Reference number
0x0000
Byte 10, 11
Word count
0x0002
Exception
Table 119: Exception of Function code FC16
Byte
Field name
Example
...
Byte 7
MODBUS function code 0x85
Byte 8
Exception code
0x01 or 0x02
Pos: 109.13 /Dokumentation allgemein/Gliederungselemente/---Seitenwechsel--- @ 3\mod_1221108045078_0.doc @ 21810 @ @ 1
