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Fieldbus controller 750-842
Example of process output image
Modular I/O System
ETHERNET TCP/IP
3.2.4.2
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, output data can be read back with an offset of 200
hex
(0x0200)
added to the MODBUS address.
Bit 1
Bit 2
Word2
Word1
Word2
Word1
Word2
Word1
Word2
Word1
Word2
Word1
Word2
Word1
0x0003 / 0x0203 %QW3
0x0002 / 0x0202 %QW2
0x0001 / 0x0201 %QW1
0x0000 / 0x0200 %QW0
0x0004 / 0x0204 %QW4
0x0203 %QW3
0x0202 %QW2
0x0201 %QW1
0x0200 %QW0
0x0204 %QW4
0x0000 / 0x0200 %QX4.0
0x0001 / 0x0201 %QX4.1
0x0200 %QX4.0
0x0201 %QX4.1
ON
LINK
TxD/RxD
ERROR
Ethernet
750-842
WA
G
O
ß
I/
O
ß
SY
ST
E
M
AO
DO
AO
Highbyte
Lowbyte
Highbyte
Lowbyte
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. 3-25: Example of a process output image
G012925e