Siemens SIMATIC S5-90U System Manual page 454

Module Spectrum
Standard function blocks FB250 (read in analog value) and FB "polygon function" can be used to
normalize and linearize the analog value when measuring with PT 100. Set type of channel y =4
"unipolar" in function block FB 250.
The non-linear temperature/resistance characteristic of PT 100 can be linearized via interpolation
points using function block FB "polygon function". For the interpolation points please see the
standard characteristic of the PT 100 in IEC 751.
Table 15-31. Analog Input Module 464-8MF21, ± 500 mV (Bipolar Fixed-Point Number )
Units Meas. Val.
in mV
>4095 1000.0
4095 999.75
2049 500.24
2048 500.0
1024 250.0
1 0.24
0 0.0
- 1 - 0.24
- 1024 - 250.0
- 2048 - 500.0
- 2049 - 500.24
- 4095 - 999.75
<- 4095 - 1000.0
15-88
High Byte
0 1 1 1 1 1 1
0 1 1 1 1 1 1
0 1 0 0 0 0 0
0 1 0 0 0 0 0
0 0 1 0 0 0 0
0 0 0 0 0 0 0
0 0 0 0 0 0 0
1 1 1 1 1 1 1
1 1 1 0 0 0 0
1 1 0 0 0 0 0
1 0 1 1 1 1 1
1 0 0 0 0 0 0
1 0 0 0 0 0 0
Low Byte
1 1 1 1 1 1 0 0
1 1 1 1 1 1 0 0
0 0 0 0 0 1 0 0
0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0
0 0 0 0 0 1 0 0
0 0 0 0 0 0 0 0
1 1 1 1 1 1 0 0
0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0
1 1 1 1 1 1 0 0
0 0 0 0 0 1 0 0
0 0 0 0 0 1 0 0
EWA 4NEB 812 6115-02b
S5-90U/S5-95U
Range
1 Overflow
0 Overrange
0
0
0
0
0 Nominal range
0
0
0
0 Overrange
0
1 Overflow