750-841 WAGO, 750-841 Datasheet - Page 69
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750-841
Manufacturer Part Number
750-841
Description
CONTR.ETHERNET TCP/IP 10/100MBIT
Manufacturer
WAGO
Datasheet
1.750-841.pdf
(288 pages)
Specifications of 750-841
Rohs Compliant
YES
No. Of Digital Inputs
10
No. Of Digital Outputs
10
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3.1.6.3 Data Exchange between MODBUS/TCP Master and I/O Modules
WAGO-I/O-SYSTEM 750
ETHERNET TCP/IP
Address calculation (depending upon the word address):
Dword address:
The data exchange between the MODBUS/TCP Master and the I/O modules is
made via the Ethernet Fieldbus port using MODBUS TCP read and write
commands.
The controller handles four different types of process data with MODBUS
TCP:
The relationship between bits and words are defined in the table below:
Addressing Example:
•
•
•
•
Digital inputs/outputs
Process data word
Byte
Bit address:
Byte address:
Table 3.1.9: Allocation of Digital Inputs/Outputs to Process Data Word in Intel Format
Input words
Output words
Input bits
Output bits
or
word address (even numbers) / 2
word address (uneven numbers) / 2, rounded off
16.
Bit
15
High-Byte
D1
15. 14. 13. 12. 11. 10. 9.
Bit
14
Bit
13
Bit
12
word address .0 to .15
1. Byte: 2 x word address
2. Byte: 2 x word address + 1
Bit
11
Bit
10
Bit
9
Fieldbus Controller 750-841
Bit
8
8.
Bit
7
Low-Byte
D0
Fieldbus Controller
7.
Bit
6
6.
Bit
5
5.
Bit
4
4.
Bit
3
3.
Bit
2
2.
Bit
1
• 61
1.
Bit
0
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