236 Fieldbus Communication
WAGO-I/O-SYSTEM 750
750-880, 750-880/025-000 ETHERNET Programmable Fieldbus Controller
Manual
Version 1.0.1
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12.2.3.10 Function Code FC22 (Mask Write Register)
This function manipulates individual bits within a register using a combination of
an AND mask, an OR mask, and the register’s current content.
Request
Table 120: Request of Function code FC22
Byte
Field name
Example
Byte 0, 1
Transaction identifier
0x0000
Byte 2, 3
Protocol identifier
0x0000
Byte 4, 5
Length field
0x0002
Byte 6
Unit identifier
0x01 not used
Byte 7
MODBUS function code 0x16
Byte 8, 9
Reference number
0x0000
Byte 10, 11
AND mask
0x0000
Byte 12, 13
OR mask
0xAAAA
Response
Table 121: Response of Function code FC22
Byte
Field name
Example
...
Byte 7
MODBUS function code 0x10
Byte 8, 9
Reference number
0x0000
Byte 10, 11
AND mask
0x0000
Byte 12, 13
OR mask
0xAAAA
Exception
Table 122: Exception of Function code FC22
Byte
Field name
Example
...
Byte 7
MODBUS function code 0x85
Byte 8
Exception code
0x01 or 0x02
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