Technical data

50 • Fieldbus Controller 750-841
Process Image
WAGO-I/O-SYSTEM 750
ETHERNET TCP/IP
3.1.4.2 Example of a Process Output Image
The following figure is an example of a process output image. The
configuration includes 2 digital and 4 analog outputs. Therefore, the process
image has a total data length of 5 (4 words for the analog data and 1 word for
the digital outputs). When using MODBUS protocol, output data can be read
back with an offset of 200
hex
(0x0200) added to the MODBUS address.
Note
All output data over 256 words can be read back with an offset of 1000
hex
(0x1000) added onto 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
WAGO
ßI/O
ßSYS TEM
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. 3-7: Example of a Process Output Image G012925e