WAGO-I/O-SYSTEM 750
Process Image
33
750-451 8 AI RTD
Manual
Version 1.1.0
4.3.4
Pt1000 (IEC 751), ID 2
4.3.4.1 Default Format
With the setting “Pt1000 (IEC 751)”, the I/O module converts the measured
resistance values of Ni100-Pt100 sensors (IEC 751) into temperature values and
outputs the conversion results in degrees Celsius.
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 maximum number
range viewable in one word in two's complement representation ranges from
−32768 to +32767. The number range used depends on the sensor type set and the
resolution of the process value. For the setting “Pt1000 (IEC 751)”, the possible
numerical range corresponds
to the defined temperature range of −200 °C to +850
°C and ranges from −2000 to +8500 accordingly.
Table 24: ID 2, Setting Pt1000 (IEC 751), Standard Format
Temperature
°C
Resistance
Ω
Numeric value
1)
Status
byte
hex.
Error
LED
Binary
Hex.
Dec.
---
< 10.00
'1111.1000.0011.0000'
0xF830
−2000
0x50
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)
---
> 5010.00
'0010.0001.0011.0100'
0x2134
8500
0x60
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 “Diagnostics” > “Behavior in
the Event of an Error”)
3) When underrange / overrange limit is ON (see section “Diagnostics” > “Behavior in the Event
of an Error”)