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Fieldbus Controller • 61
Fieldbus Controller 750-872/020-000
WAGO-I/O-SYSTEM 750
ETHERNET TCP/IP
Addressing Example:
Address calculation (depending upon the word address):
Bit address:
word address .0 to .15
Byte address:
1. Byte: 2 x word address
2. Byte: 2 x word a 1
Dword address:
word address (even numbers) / 2
or
word address (uneven numbers) / 2, rounded off
3.1.6.3 Data Exchange between MODBUS/TCP Master and I/O Modules
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:
•
Input words
•
Output words
•
Input bits
•
Output bits
The relationship between bits and words are defined in the table below:
Digital inputs/outputs
16. 15.
14.
13.
12.
11.
10.
9. 8. 7. 6. 5. 4. 3. 2. 1.
Process data word
Bit
15
Bit
14
Bit
13
Bit
12
Bit
11
Bit
10
Bit
9
Bit
8
Bit
7
Bit
6
Bit
5
Bit
4
Bit
3
Bit
2
Bit
1
Bit
0
High-Byte Low-Byte
Byte
D1 D0
Table 3.1.9: Allocation of Digital Inputs/Outputs to Process Data Word in Intel Format