Siemens SIMATIC S5-90U System Manual page 420

Module Spectrum
If you equip several channels with thermocouples, use the same type of thermocouple.
select mixed thermocouples, or if you use thermocouples other than type J, K, or L, then you must
choose the following settings.
• "No linearization"
• "No temperature compensation"
When you set the switches to "no linearization" and "no temperature compensation", then module
464-8MA21 functions just like module 464-8MA11.
Analog Value Representation
The following tables show the analog value representation of the analog input module 6ES5 464-
8MA21, depending on the switch position or the operating mode of the module:
Table 15-13. Analog Input Module 464-8MA21, 4 x ± 50 mV, without Linearization and
without Temperature Compensation (Internal) (Bipolar Fixed-Point Number)
Units Meas. Val.
in mV
>4095 100.0
4095 99.976
2049 50,024
2048 50.0
1024 25.0
1 0.024
0 0.0
- 1 - 0.024
- 1024 - 25.0
- 2048 - 50.0
- 2049 - 50.024
- 4095 - 99.976
<- 4095 - 100.0
Standard function blocks FB 250 (read in analog value) and FB "polygon function" can be used to
normalize and linearize the analog value. Set type of channel y=6 "bipolar fixed-point number" in
function block FB 250.
The non-linear temperature/voltage characteristic of the thermocouples can be linearized via
interpolation points using function block FB "polygon function".
For the interpolation points please see the standard characteristic of the individual type of
thermocouple in IEC 584 or DIN 43710.
15-54
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
If you
Range
1 Overflow
0 Overrange
0
0
0
0
0 Nominal range
0
0
0
0 Overrange
0
1 Overflow