WAGO-I/O-SYSTEM 750
Process Image
97
750-464 2/4 AI RTD configurable
Manual
Version 1.0.1
7.5.3
NTC 10 kOhm Thermokon
With the setting "NTC 10 kOhm Thermokon", the I/O module converts the
resistance measured values of NTC 10 kOhm Thermokon resistance sensors and
outputs them as temperature values.
The temperature values are displayed at a resolution of 1 digit per 0.1 °C in one
word (16-bit). Temperature values below 0 °C are represented in two's
complement binary. As a result, 0 °C corresponds to the numeric value 0x0000
and 100 °C to the numeric value 0x03E8 (dec. 1000).
The possible numeric range corresponds to the defined temperature range of
-40 °C to +150 °C.
Table 82: Process image for 750-464/020-000, NTC 10 kOhm Thermokon setting
Temperature
°C
Resistance
k
Ω
Numeric value
1)
Status
byte
hex.
LED
error
AI 1, 2
Binary
Hex.
Dec.
< -40.0
> 426.50
'1111.1110.0111.0000'
0xFE70
-400
0x41
on
Underrange
3)
-40.0
> 426.50
'1111.1110.0111.0000'
0xFE70
-400
0x41
on
-30.0
210.08
'1111.1110.1101.0100'
0xFED4
-300
0x00
off
0.0
34.28
'0000.0000.0000.0000'
0x0000
0
0x00
off
25.0
10.00
'0000.0000.1111.1010'
0x00FA
250
0x00
off
50.0
3.53
'0000.0001.1111.0100'
0x01F4
500
0x00
off
100.0
0.67
'0000.0011.1110.1000'
0x03E8
1000
0x00
off
150.0
0.185
'0000.0101.1101.1100'
0x05DC
1500
0x00
off
> 150.0
< 0.185
'0000.0101.1101.1100'
0x05DC
1500
0x42
on
Overrange
3)
---
<0.009
'0000.0101.1101.1100'
0x05DC
1500
0x52
on
Short circuit
2)
1) Temperature values below 0 °C are represented in two's complement binary.
2) When short circuit and wire break monitoring is ON (see section "Behavior in the Event of an
Error")
3) When underrange / overrange limit is ON (see section "Behavior in the Event of an Error")
