Selection Tables For The Sm 1231 Thermocouple - Siemens SIMATIC S7-1200 System Manual
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A.11.1.2
Selection tables for the SM 1231 thermocouple
The ranges and accuracy for the different thermocouple types supported by the SM 1231
Thermocouple signal module are shown in the table below.
Table A- 169 SM 1231 Thermocouple selection table
Type
Under-range
minimum
J
-210.0 °C
K
-270.0 °C
T
-270.0 °C
E
-270.0 °C
R & S
-50.0 °C
B
0.0 °C
--
N
-270.0 °C
C
0.0 °C
TXK/XK(L)
-200.0 °C
Voltage
-32512
Thermocouple values below the under-range minimum value are reported as -32768.
1
Thermocouple values above the over-range minimum value are reported as 32767.
2
Internal cold junction error is ±1.5 °C for all ranges. This adds to the error in this table. The module requires at least 30
3
minutes of warm-up time to meet this specification.
In the presence of radiated radio frequency of 970 MHz to 990 MHz, the accuracy of the SM 1231 AI 4 x 16 bit TC may
4
be degraded.
Note
Thermocouple channel
Each channel on the Thermocouple signal module can be configured with a different
thermocouple type (selectable in the software during configuration of the module).
S7-1200 Programmable controller
System Manual, V4.2, 09/2016, A5E02486680-AK
Nominal range
low limit
1
-150.0 °C
-200.0 °C
-200.0 °C
-200.0 °C
100.0 °C
200.0 °C
800.0 °C
-200.0 °C
100.0 °C
-150.0 °C
-27648
-80mV
A.11 Thermocouple and RTD signal modules (SMs)
Nominal range
Over-range
high limit
maximum
1200.0 °C
1450.0 °C
1372.0 °C
1622.0 °C
400.0 °C
540.0 °C
1000.0 °C
1200.0 °C
1768.0 °C
2019.0 °C
800.0 °C
--
1820.0 °C
1820.0 °C
1300.0 °C
1550.0 °C
2315.0 °C
2500.0 °C
800.0 °C
1050.0 °C
27648
32511
80mV
Technical specifications
Normal range
Normal range
3, 4
accuracy @ 25 °C
accuracy -20 °C
2
to 60 °C
±0.3 °C
±0.6 °C
±0.4 °C
±1.0 °C
±0.5 °C
±1.0 °C
±0.3 °C
±0.6 °C
±1.0 °C
±2.5 °C
±2.0 °C
±2.5 °C
±1.0 °C
±2.3 °C
±1.0 °C
±1.6 °C
±0.7 °C
±2.7 °C
±0.6 °C
±1.2 °C
±0.05%
±0.1%
1, 2
1477
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