750-841 WAGO, 750-841 Datasheet - Page 169

• 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

4.2.3.9 Function Code FC16 (Write multiple registers)
WAGO-I/O-SYSTEM 750
ETHERNET TCP/IP
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:
Response
Exception
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
Byte
.....
Byte 7
Byte 8, 9
Byte 10, 11
Byte
.....
Byte 7
Byte 8
Register Value 1
Register Value 2
Field name
Transaction identifier
protocol identifier
length field
Unit identifier
MODBUS function code
reference number
Word count
Byte Count
Field name
MODBUS function code
Reference number
Word Count
Field name
MODBUS function code
Exception code
Example
0x0000
0x0000
0x000B
0x01 not used
0x10
0x0000
0x0002
0x04
0x1234
0x2345
Example
0x10
0x0000
0x0002
Example
0x85
0x01 or 0x02
Fieldbus Communication
MODBUS Functions
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