WAGO 750-830 Manual page 71

Calculating addresses (as a function of the word address):
Bit address:
Byte address:
DWord address
3.1.6.3 Data Exchange between MODBUS/TCP Master and Bus Modules
Data exchange between the MODBUS/TCP master and the bus modules is con-
ducted using the MODBUS functions implemented in the controller by means
of bit-by-bit or word-by-word reading and writing routines.
There are four (4) different types of process data in the controller:
• Input words
• Output words
• Input bits
• Output bits
Access word-by-word to the digital I/O modules is carried out in accordance
with the following table:
Tab. 3-14: Allocation of digital inputs and outputs to process data words in accordance with
the Intel format
Digital inputs/
outputs
Process Data Word
Byte
Output can be read back in by adding an offset of 200
MODBUS address.
Note
All output data greater than 256 words and, therefore located in the memory
range 0x6000 to 0x62FC, can be read back by adding an offset of 1000
(0x1000) to the MODBUS address.
WAGO-I/O-SYSTEM 750
BACnet/IP Controller
Word address .0 to .15
1st byte: 2 x word
2nd byte: 2 x word address + 1
Word address (even number) / 2 or
Word address (uneven number) / 2, rounded
16. 15. 14. 13. 12. 11. 10. 9.
Bit Bit Bit Bit Bit Bit
15 14 13 12 11 10
High-byte
D1
BACnet/IP Controller 750-830
Data Exchange
8. 7. 6. 5.
Bit Bit Bit Bit Bit Bit
9 8 7 6 5 4
Low-byte
D0
(0x0200) to the
hex
• 71
4. 3. 2. 1.
Bit Bit Bit Bit
3 2 1 0
hex