Siemens SIMATIC S5-100U System Manual page 281

S5-100U
Table 11-2. Operating Mode Switch Settings for Analog Input Module 464-8MA21
(continued)
Function
Characteristic
linearization of
thermocouples
Temperature
compensation
If you have set "Characteristic linearization" and "Temperature compensation" with the operating
mode switches on module 464-8MA21 for the thermocouple used, then the reference temperature
is 0° C (32° F). This means that with 0° C (32° F) at the measuring junction, the value "0" is dis-
played.
If you equip several channels with thermocouples, use the same type of thermocouple. If you select
mixed thermocouples, or if you use thermocouples other than type J, K, or L, then you must choose
the following two settings:
• "No linearization"
• "No temperature compensation"
Compensation is then not possible even with a compensating box because the compensating box is
designed only for a certain type of thermocouple. It is possible to use a thermostat in the terminal
box if you use the thermostat temperature in the application software to adjust the thermocouple
input offset.
When you set the switches to "no linearization" and "no temperature compensation", then module
464-8MA21 functions just like module 464-8MA11.
EWA 4NEB 812 6120-02b
Settings for Operating Mode Switch
without Linearization
linearization type K
8
7
6
5
4
3
2
1
without temperature Temperature compen-
compensation
8
7
6
5
4
3
2
1
Analog Value Processing
Linearization
type J
8 8
7 7
6 6
5 5
4 4
3 3
2 2
1 1
Temperature compen-
sation for type K sation for types J and L
8
7
6
5
4
3
2
1
Linearization
type L
8
7
6
5
4
3
2
1
8
7
6
5
4
3
2
1
11-9