750-841 WAGO, 750-841 Datasheet - Page 170

• Manufacturer Part Number: 750-841
• Description: CONTR.ETHERNET TCP/IP 10/100MBIT
• Manufacturer: WAGO

Specifications of 750-841

• Rohs Compliant: YES
• No. Of Digital Inputs: 10
• No. Of Digital Outputs: 10

162 •
4.2.3.10
Fieldbus Communication
MODBUS Functions
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
Response
Exception
Byte
Byte 0, 1
Byte 2, 3
Byte 4, 5
Byte 6
Byte 7
Byte 8-9
Byte 10-11
Byte 12-13
.....
Byte 7
Byte 8-9
Byte 10-11
Byte 12-13
Byte
.....
Byte 7
Byte 8
Byte
Field name
Transaction identifier
protocol identifier
length field
Unit identifier
MODBUS function code
Reference Number
AND-Mask
OR-Mask
Field name
MODBUS function code
Reference Number
AND-Mask
OR-Mask
Field name
MODBUS function code
Exception code
Example
0x0000
0x0000
0x0002
0x01 not used
0x16
0x0000
0x0000
0xAAAA
Example
0x10
0x0000
0x0000
0xAAAA
Example
0x85
0x01 or 0x02
WAGO-I/O-SYSTEM 750
ETHERNET TCP/IP