WAGO-I/O-SYSTEM 750
750-464 2/4 AI RTD configurable
4.3.3
Pt500 (acc. IEC 751)
With the setting "Pt500 (acc. IEC 751)", the I/O module converts the resistance
measured values of Pt500 sensors (acc. IEC 751) 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
−200 °C ... +850 °C for Pt500 sensors (acc IEC 751).
Table 27: Process image for 750-464, Pt500 setting (acc. IEC 751)
Temperature
°C
---
Short circuit
< −200.0
Underrange
−200.0
−100.0
0.0
100.0
200.0
500.0
750.0
800.0
850.0
> 850.0
Overrange
---
Wire break
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")
Resistance
Ω
Binary
< 9.00
'1111.1000.0011.0000'
2)
< 92.60
'1111.1000.0011.0000'
3)
92.60
'1111.1000.0011.0000'
301.28
'1111.1100.0001.1000'
500.00
'0000.0000.0000.0000'
692.53
'0000.0011.1110.1000'
879.28
'0000.0111.1101.0000'
1404.89
'0001.0011.1000.1000'
1803.19
'0001.1101.0100.1100'
1878.52
'0001.1111.0100.0000'
1952.41
'0010.0001.0011.0100'
> 1952.41
'0010.0001.0011.0100'
3)
> 5500.00
'0010.0001.0011.0100'
2)
1)
Numeric value
Hex.
0xF830
0xF830
0xF830
0xFC18
0x0000
0x03E8
0x07D0
0x1388
0x1D4C
0x1F40
0x2134
0x2134
0x2134
Process Image
43
Status
LED
byte
error
hex.
AI 1, 2
Dec.
−2000
0x51
on
−2000
0x41
on
−2000
0x00
off
−1000
0x00
off
0
0x00
off
1000
0x00
off
2000
0x00
off
5000
0x00
off
7500
0x00
off
8000
0x00
off
8500
0x00
off
8500
0x42
on
8500
0x62
on
Manual
Version 1.1.0