WAGO I/O SYSTEM 750 XTR
Process Image 35
750-481/040-000 2AI RTD Ex i XTR
Manual
Version 1.1.0
4.2
Configuration for Ni Resistance Sensors
To evaluate the nickel resistance sensors, the measured values of the resistance
are converted and sent as temperature values. All temperature values are
represented in a standard numeric format. The possible numerical range
matches the defined temperature range of the Ni sensors
from −60 °C to +250 °C
or from −
80 °C to +320 °C.
In the Ni 100, Ni 120 and Ni 1000 settings, 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).
Temperature values below 0 °C are represented in two’s complement binary
form.
Table 22: Process Image at Configuration for Ni100 and Ni1000
Temperature
°C
Numerical value
1)
Status
byte
hex.
LED
Error
AI 1, AI 2
binary
hex.
dec.
<
−
60.0
'1000.0000.0000.0001' 0x8001
−
32767
0x41
On
−
60.0
'1111.1101.1010.1000' 0xFDA8
−
600
0x00
Off
−
50.0
'1111.1110.0000.1100' 0xFE0C
−
500
0x00
Off
0.0
'0000.0000.0000.0000' 0x0000
0
0x00
Off
50.0
'0000.0001.1111.0100' 0x01F4
500
0x00
Off
100.0
'0000.0011.1110.1000' 0x03E8
1000
0x00
Off
150.0
'0000.0101.1101.1100' 0x05DC
1500
0x00
Off
200.0
'0000.0111.1101.0000' 0x07D0
2000
0x00
Off
250.0
'0000.1001.1100.0100' 0x09C4
2500
0x00
Off
> 250.0
'0010.0001.0011.0100' 0x2134
8500
0x42
On
Broken wire
against RL
'0010.0001.0011.0100' 0x2134
8500
0x42
On
1)
Temperature values below 0 °C are represented in two’s complement binary form.
The measured value can exceed the range from 8500 until the limitation applies.
