WAGO-I/O-SYSTEM 750
Process Image
99
750-464 2/4 AI RTD configurable
Manual
Version 1.0.1
7.6.2
NTC 20 kOhm
With the setting "NTC 20 kOhm" and activated Siemens format, the I/O module
converts the resistance measured values of NTC20 kOhm resistance sensors and
outputs them as temperature values.
The temperature values are displayed at a resolution of 1 digit per 0.5 °C.
The status information is depicted in bit 0 to bit 2 and the digitalized measured
value in bit 3 to bit 15.
Table 84: Process image for 750-464/020-000, NTC 20 kOhm setting
Temperature
°C
Resistance
k
Ω
Numeric value
1)
with status information
4)
Status-
byte
Hex.
LED
error
AI 1, 2
Binary
XFÜ
Hex.
Dec.
< -50.0
> 2288.96
'1111.1100.1110.0 001' 0xFCE1
-799
0x41
on
Underrange
3)
-50.0
2288.96
'1111.1100.1110.0 000' 0xFCE0
-800
0x00
off
0.0
70.20
'0000.0000.0000.0 000' 0x0000
0
0x00
off
25.0
20.00
'0000.0001.1001.0 000' 0x0190
400
0x00
off
50.0
6.72
'0000.0011.0010.0 000' 0x0320
800
0x00
off
100.0
1.18
'0000.0110.0100.0 000' 0x0640
1600
0x00
off
150.0
0.305
'0000.1001.0110.0 000' 0x0960
2400
0x00
off
> 150.0
< 0.305
'0000.1001.0110.0 001' 0x0961
2401
0x42
on
Overrange
3)
---
<0.009
'0000.1001.0110.0 011' 0x0963
2403
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")
4) Status information: X: Not used, F: Short circuit, wire break, Ü: Overrange
