24
•
Fieldbus coupler 750-342
Data exchange
Modular I/O System
ETHERNET TCP/IP
3.1.4.1
Example of a process input image
The following figure is an example of a process input image.
The configuration comprises of 16 digital and 8 analog inputs.
The process image thus has a data length of 8 words for the analog and 1 word
for the digital inputs, i.e. 9 words in total.
Bit 1
Bit 4
Word2
Word1
Word2
Word1
Word2
Word1
Word2
Word1
Word2
Word1
Word2
Word1
1
4
1
4
1
1
4
1
ON
LINK
TxD/RxD
ERROR
Ethernet
750-842
I/O
WA
G
O
ß
I/O
ß
SY
ST
EM
DI DI
DI
DI
AI AI
AI
AI
Word2
Word1
Word2
Word2
Word1
Highbyte
Lowbyte
0x0003
0x0002
0x0001
0x0000
0x0005
0x0004
0x0007
0x0006
0x0008
0x0001
0x0000
0x0003
0x0002
0x0004
0x0004
0x0008
0x000C
0x0005
0x0005
0x0009
0x000D
0x0006
0x0006
0x000A
0x000E
0x0007
0x0007
0x000B
0x000F
Process input image
(Word)
MODBUS addresses
Process input image
(Bit)
Input modules
750- 402
402
472
472
402
476
402
476
DI: Digital Input
AI:Analog Input
MODBUS addresses
Fig. 3-7: Example of a process input image
G012914e