Process Image 35
750-458 8AI; TC; Adjust
Manual
Version 1.3.0
4.3.2
Sensors for Temperature Measurement (°C)
4.3.2.1 Standard Data Format
For I/O module 750-458, the temperature values of the sensors are displayed at
a resolution of 1 digit per 0.1 °C in one word (16-bit). As a result, 0 °C
corresponds to the numeric value 0x0000 and 100 °C to the numeric value
0x03E8 (dec. 1000). The temperature underranges and overranges refer to
manufacturer range violations.
Table 21: Process Image Type E, ID0, Two's Complement Representation
Temperature
°C
Numeric value
1)
Status
Byte
Hex.
Error
LED
Binary
Hex.
Dec.
---
'1000.0000.0000.0000'
0x8000
−
32768
0x00
OFF
Range violation, cold
junction
< −200.0
'1111.1000.0011.0000'
0xF830
−2000
0x41
ON
Underrange
−200.0
'1111.1000.0011.0000'
0xF830
−2000
0x00
OFF
−100.0
'1111.1100.0001.1000'
0xFC18
−1000
0x00
OFF
0.0
'0000.0000.0000.0000'
0x0000
0
0x00
OFF
100.0
'0000.0011.1110.1000'
0x03E8
1000
0x00
OFF
200.0
'0000.0111.1101.0000'
0x07D0
2000
0x00
OFF
300.0
'0000.1011.1011.1000'
0x0BB8
3000
0x00
OFF
400.0
'0000.1111.1010.0000'
0x0FA0
4000
0x00
OFF
500.0
'0001.0011.1000.1000'
0x1388
5000
0x00
OFF
600.0
'0001.0111.0111.0000'
0x1770
6000
0x00
OFF
700.0
'0001.1011.0101.1000'
0x1B58
7000
0x00
OFF
900.0
'0010.0011.0010.1000'
0x2328
9000
0x00
OFF
999.0
'0010.0111.0000.0110'
0x2706
9990
0x00
OFF
1000.0
'0010.0111.0001.0000'
0x2710
10000
0x00
OFF
Overrange
'0010.0111.0001.0000'
0x2710
10000
0x42
ON
> 1000.0
Wire break
'0111.1111.1111.1111'
0x7FFF
32767
0x60
ON
---
1)
Temperature values below 0 °C are represented in two's complement binary.