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WAGO-I/O-SYSTEM 750
Process Image
95
750-464 2/4 AI RTD configurable
Manual
Version 1.0.1
7.5
Data of the Version 750-464/020-000 (NTC,
configurable)
7.5.1
NTC 10 kOhm
With the setting "NTC 10 kOhm", the I/O module converts the resistance
measured values of NTC 10kOhm 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 the
sensors from -50 °C to +150 °C.
Table 80: Process image for 750-464/020-000, NTC 10 kOhm setting
Temperature
°C
Resistance
k
Ω
Numeric value
1)
Status
byte
hex.
LED
error
AI 1, 2
Binary
Hex.
Dec.
< -50.0
>1144.48
'1110.1100.0111.1000' 0xFE0C
-500
0x41
on
Underrange
3)
-50.0
1144.48
'1110.1100.0111.1000' 0xFE0C
-500
0x00
off
0.0
36.35
'0000.0000.0000.0000'
0x0000
0
0x00
off
25.0
10.00
'0000.0000.1111.1010'
0x00FA
250
0x00
off
50.0
3.36
'0000.0011.0010.0000'
0x01F4
500
0x00
off
100.0
0.59
'0000.0011.1110.1000'
0x03E8
1000
0x00
off
150.0
0.155
'0000.0101.1101.1100' 0x05DC
1500
0x51
off
> 150.0
< 0.155
'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")