76
Process Image
WAGO-I/O-SYSTEM 750
750-464 2/4 AI RTD configurable
Manual
Version 1.0.1
7.3.4
Pt1000 (acc. IEC 751)
With the setting "Pt1000 (acc. IEC 751)", the I/O module converts the resistance
measured values of Pt1000 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 to +850 °C for Pt1000 sensors (acc. IEC 751).
Table 62: Process image for 750-464, Pt1000 setting (acc. IEC 751)
Temperature
°C
Resistance
Ω
Numeric value
1)
Status
byte
hex.
LED
error
AI 1, 2
Binary
Hex.
Dec.
---
< 9.00
'1111.1000.0011.0000'
0xF830
-2000
0x51
on
Short circuit
2)
< -200.0
< 185.20
'1111.1000.0011.0000'
0xF830
-2000
0x41
on
Underrange
3)
-200.0
185.20
'1111.1000.0011.0000'
0xF830
-2000
0x00
off
-100.0
602.56
'1111.1100.0001.1000'
0xFC18
-1000
0x00
off
0.0
1000.00
'0000.0000.0000.0000'
0x0000
0
0x00
off
100.0
1385.06
'0000.0011.1110.1000'
0x03E8
1000
0x00
off
200.0
1758.56
'0000.0111.1101.0000'
0x07D0
2000
0x00
off
500.0
2809.78
'0001.0011.1000.1000'
0x1388
5000
0x00
off
750.0
3606.38
'0001.1101.0100.1100'
0x1D4C
7500
0x00
off
800.0
3757.04
'0001.1111.0100.0000'
0x1F40
8000
0x00
off
850.0
3904.81
'0010.0001.0011.0100'
0x2134
8500
0x00
off
> 850.0
> 3904.81
'0010.0001.0011.0100'
0x2134
8500
0x42
on
Overrange
3)
---
> 5500.00
'0010.0001.0011.0100'
0x2134
8500
0x62
on
Wire break
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")
