Fieldbus coupler 750-342 • 25
Data exchange
Modular I/O System
ETHERNET TCP/IP
3.1.4.2
Example of a process output image
The following example for the process output image comprises of 2 digital and
4 analog outputs.
It comprises of 4 words for the analog and 1 word for the digital outputs, , i.e.
5 words in total.
In addition, the output data can be read back by means of an offset of 200hex
(0x0200) added to the MODBUS address.
Bit 1
Bit 2
Word2
Word1
Word2
Word1
Word2
Word1
Word2
Word1
Word2
Word1
Word2
Word1
0x0003 / 0x0203
0x0002 / 0x0202
0x0001 / 0x0201
0x0000 / 0x0200
0x0004 /
0x0204
0x0203
0x0202
0x0201
0x0200
0x0204
0x0000 / 0x0200
0x0001 / 0x0201
0x0200
0x0201
ON
LINK
TxD/RxD
ERROR
Ethernet
750-342
I/O
WA
G
O
ß
I/
O
ß
SY
ST
E
M
Highbyte
Lowbyte
Highbyte
Lowbyte
AO
DO
AO
MODBUS addresses
MODBUS addresses
MODBUS addresses
MODBUS addresses
Process output image
(Word)
Process input image
(Word)
Process output image
(Bit)
Process input image
(Bit)
DO: Digital Output
AO: Analog Output
Output modules
750 - 501
550
550
Fig. 3-8: Example of a process output image
G012915e