WAGO-I/O-SYSTEM 750
Process Image 53
750-450 4 AI RTD
Manual
Version 1.2.0
4.3.12 Pt1000 (IEC 751), High-Resolution, ID 10
4.3.12.1 Standard Format
The "Pt1000 (IEC 751)" setting is used by the I/O module to convert the
resistance measured values from Pt1000 sensors (IEC 751) to temperature
values and outputs the results in degrees Celsius.
The temperature values are displayed with a resolution of 1 digit per 0.01 °C in
one word (16 bits). 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 0x2710 (dec. 1000). The maximum numeric range in the two's
complement representation that can be displayed with one word ranges from -
32768 to +32767. The numeric range that is used depends on the set sensor
type and on the resolution for the process value. With the "Pt1000 (IEC 751)"
setting, the possible numeric range corresponds to the temperature range of −50
°C to +150 °C, meaning it covers a range of −5000 to +15000.
Table 46: ID 10, Pt1000 Setting (IEC 751), Standard Format
Temperature
°C
Resistance
Ω
Numeric value
1)
Status
byte
hex.
Error
LED
Binary
Hex.
Dec.
---
< 10.00
'1110.1100.0111.1000'
0xEC78
−5000
0x50
ON
Short circuit
2)
< −50.0
< 803.06
'1110.1100.0111.1000'
0xEC78
−5000
0x41
ON
Underrange
3)
−50.0
803.06
'1110.1100.0111.1000'
0xEC78
−5000
0x00
OFF
−25.0
901.92
'1111.0110.0011.1100'
0xF63C
−2500
0x00
OFF
0.0
1000.00
'0000.0000.0000.0000'
0x0000
0
0x00
OFF
25.0
1097.35
'0000.1001.1100.0100'
0x09C4
2500
0x00
OFF
50.0
1193.97
'0001.0011.1000.1000'
0x1388
5000
0x00
OFF
75.0
1289.87
'0001.1101.0100.1100'
0x1D4C
7500
0x00
OFF
100.0
1385.06
'0010.0111.0001.0000'
0x2710
10000
0x00
OFF
125.0
1479.51
'0011.0000.1101.0100'
0x30D4
12500
0x00
OFF
150.0
1573.25
'0011.1010.1001.1000'
0x3A98
15000
0x00
OFF
> 150.0
> 1573.25
'0011.1010.1001.1000'
0x3A98
15000
0x42
ON
Overrange
3)
---
> 5010.00
'0011.1010.1001.1000'
0x3A98
15000
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" > "Error
Response")
3) When lower/upper limit violation detection is on (see Section "Diagnostics" > "Error Response")