WAGO I/O SYSTEM 750 XTR
Process Image 33
750-585/040-000 2AO 0-20mA Ex i XTR
Manual
Version 1.1.0
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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 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.
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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.
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The analog output module 750-585/040-000 transmits 16-bit measured values
and 8 optional status bits per channel.
The digitalized output value is transmitted in a data word (16 bits) as output byte
0 (low) and output byte 1 (high) via the process image of the fieldbus
coupler/controller.
The output current ranging from 0 … 20 mA is scaled on the numerical values
ranging from 0x0000 to 0x7FFF.
This value is represented with a 12 bit resolution on bit B3 … B14. The 3 least
significant bits (B0 … B2) are not parsed.
Table 21: Process Image
Output current
0 … 20 mA
Numercial value
Status byte
hex.
Binary
Output value
Hex.
Dec.
0.0
'0000.0000.0000.0000'
0x0000
0
0x00
2.5
'0001.0000.0000.0000'
0x1000
4096
0x00
5.0
'0010.0000.0000.0000'
0x2000
8192
0x00
7.5
'0011.0000.0000.0000'
0x3000
12288
0x00
10.0
'0100.0000.0000.0000'
0x4000
16384
0x00
12.5
'0101.0000.0000.0000'
0x5000
20480
0x00
15.0
'0110.0000.0000.0000'
0x6000
24576
0x00
17.5
'0111.0000.0000.0000'
0x7000
28672
0x00
20.0
'0111.1111.1111.1111'
0x7FFF
32767
0x00
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