Process Image; Table 14: Process Image - Signal Voltage U - WAGO I/O-SYSTEM 750-491 Manual

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Process Image

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4 Process Image
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Mapping of process data in the process image of fieldbus systems
The representation of the I/O modules' process data in the process image depends
on the fieldbus coupler/controller used. Please take this information as well as the
particular design of the respective control/status bytes from the section "Fieldbus
Specific Design of the Process Data" included in the description concerning the
process image of the fieldbus coupler/controller used.
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Evaluation of Status Byte
Some fieldbus systems can process status information of process value by means
of a status byte.
This status byte can be displayed via the commissioning tool WAGO-I/O-
CHECK.
However, processing via the fieldbus coupler/controller is optional, which means
that accessing or parsing the status information depends on the fieldbus system.
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The bridge voltage between +U
500 nV/digit, i.e., 10 mV corresponds to an output value of 20000 in data bytes
D0 and D1.
The supply voltage of the measuring bridge is output at a resolution of
500 μV/digit, i.e., 10 V corresponds to an output value of 20000 in data bytes D2
and D3.
Table 14: Process Image – Signal Voltage U
Signal voltage
U
±15 mV
< ca. −15.5000
ca. −15.5000
−15.0000
−10.0000
−5.0000
−0.0005
0.0000
0.0005
5.0000
10.0000
15.0000
> ca. 15.5000
Wire break
D
Binary
Output value
'0111.1111.1111.1111'
'0000.0000.0000.0000'
'1000.1010.1101.0000'
'1011.0001.1110.0000'
'1101.1000.1111.0000'
'1111.1111.1111.1111'
'0000.0000.0000.0000'
'0000.0000.0000.0001'
'0010.0111.0001.0000'
'0100.1110.0010.0000'
'0111.0101.0011.0000'
'0111.1111.1111.1111'
'0111.1111.1111.1111'
and −U is output at a resolution of
D D
D
Numeric value
Hex.
0x7FFF
0x0000
0x8AD0
0xB1E0
0xD8F0
0xFFFF
0x0000
0x0001
0x2710
0x4E20
0x7530
0x7FFF
0x7FFF
WAGO-I/O-SYSTEM 750
750-491 1AI DMS
Status
LED
Byte
Hex.
Dec.
32767 0x41
0 0x00
−30000 0x00
−20000 0x00
−10000 0x00
−1 0x00
0 0x00
1 0x00
10000 0x00
20000 0x00
30000 0x00
32767 0x41
32767 0x41
Manual
Version 1.2.0
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