WAGO-I/O-SYSTEM 750 XTR
Process Image
33
750-559/040-000 4AO 0-10V DC /XTR
Manual
Version 1.3.0
4
Process Image
Mapping of process data in the process image of fieldbus systems
The representation of the process data of some I/O modules or their variations in
the process image depends on the fieldbus coupler/controller used. Please take
this information from the section “I/O Modules” included in the description
concerning the process image of the corresponding coupler/controller.
The analog output module 750-559/040-000 provides 16 bits of data and 8 status
bits per channel.
The digitalized output value is output in a data word (16 bit) via the process
image of the fieldbus coupler/controller as output byte 0 (low) and output byte 1
(high).
This value is mapped with a resolution of 12 bit to bit B3
… B14.
The three least significant bits (B0 … B2) are not evaluated.
With analog output module 750-559/040-000, the numerical value range of
0x0000 to 0x7FFF is scaled to the output voltage range of 0 V to 10 V.
Table 21: Process Image
Output Value
0 V
… 10 V
Numerical Value
Status Byte
Hex.
Binary
Output Value
Hex.
Dec.
0.00
'0000.0000.0000.0000'
0x0000
0
0x00
1.25
'0001.0000.0000.0000'
0x1000
4096
0x00
2.50
'0010.0000.0000.0000'
0x2000
8192
0x00
3.75
'0011.0000.0000.0000'
0x3000
12288
0x00
5.00
'0100.0000.0000.0000'
0x4000
16384
0x00
6.25
'0101.0000.0000.0000'
0x5000
20480
0x00
7.50
'0110.0000.0000.0000'
0x6000
24576
0x00
8.75
'0111.0000.0000.0000'
0x7000
28672
0x00
10.00
'0111.1111.1111.1111'
0x7FFF
32767
0x00
No Status Byte to evaluate!
Some fieldbus systems can process the status information of process values
using by means of a status byte.
As the returned status byte of this I/O module is always zero, it will not be
parsed.