WAGO-I/O-SYSTEM 750
Process Image
27
750-469 2AI Thermocouple
Manual
Version 1.1.0
4
Process Image
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.
4.1
Standard Data Format
For the 750-469 module and its variations with standard data format, the
temperature values of the sensors are represented with a resolution of 1 digit per
0.1 °C within a word (16 bits). Thus, 0 °C corresponds to the numeric value
0x0000 and 100 °C to 0x03E8 (dec. 1000).
Table 16: Process Image 750-469, 750-469/003-000, type K, with broken wire diagn.
Temperature
°C
Numercial value
1)
Status-
byte
hex.
LED
Error
AI 1, 2
binary
hex.
dec.
< -100.0
'1111.1100.0001.1000'
0xFC18
-1000
0x41
on
-100.0
'1111.1100.0001.1000'
0xFC18
-1000
0x00
off
0.0
'0000.0000.0000.0000'
0x0000
0
0x00
off
100.0
'0000.0011.1110.1000'
0x03E8
1000
0x00
off
200.0
'0000.0111.1101.0000'
0x07D0
2000
0x00
off
300.0
'0000.1011.1011.1000'
0x0BB8
3000
0x00
off
400.0
'0000.1111.1010.0000'
0x0FA0
4000
0x00
off
500.0
'0001.0011.1000.1000'
0x1388
5000
0x00
off
1000.0
'0010.0111.0001.0000'
0x2710
10000
0x00
off
1200.0
'0010.1110.1110.0000'
0x2EE0
12000
0x00
off
1300.0
'0011.0010.1100.1000'
0x32C8
13000
0x00
off
1370.0
'0011.0101.1000.0100'
0x3584
13700
0x00
off
> ca.1370.0
'0011.0101.1000.0100'
> 0x3584
> 13700
0x42
on
Broken wire
'0111.1111.1111.1111'
0x7FFF
32767
0x42
on
1)
Temperature values below 0 °C are represented in two’s complement binary form.