Real Representation - Siemens Simatic ET 200SP User Manual

Parameters/address space

4.5 REAL representation

Example
The following example shows the values for a thermocouple type T:
Table 4- 7
Hex. value
00
H
08
H
03
H
02
H
012C
5DC0
8100
4.5 REAL representation
Special features of REAL representation
If you have configured the module with REAL representation, the user data and hardware
interrupt limits are displayed in REAL data format (32-bit floating point number) instead of S7
format.
The representation of the measured values in the REAL representation is always related to a
physical unit, unlike in S7 representation.
This physical unit results from the measuring range you have set. For temperature ranges,
the physical unit is determined by the "Temperature unit" parameter.
REAL representation has no influence on the overranges or underranges, the overflow or
underflow diagnostics, or the QI characteristics.
Note
Substitute value for REAL representation
With REAL representation, the overflow of the substitute value 7F800000
underflow it is substitute value FF800000
28
Example of thermocouple type T
Dec. value
0
8
3
2
300
H
24000
H
-32512
H
Evaluation of data record 235
V0.0
8 bytes
Scalable measuring range active and clipped (clipping)
Resolution: 2 decimal places
Measuring range center: 300 °C
Overflow (Maximum):
240.00 + 300 = 540.00 °C
Scalable measuring range is clipped at the overflow.
Underflow (Minimum):
-325.12 + 300 = -25.12 °C
.
H
Analog input module AI 4xTC HS (6ES7134-6JD00-0DA1)
is output, for
H
Manual, 03/2019, A5E42405270-AB