Siemens SIMATIC S7-1200

Technical specifications
A.8 RTD and Thermocouple modules
Easy Book
Manual, 03/2014, A5E02486774-AF
325
Type
Under range
minimum
1
Nominal
range low limit
Nominal
range high
limit
Over range
maximum
2
Normal range
3,
4
accuracy
@ 25 °C
Normal range
3, 4
accuracy
-20 °C to 60 °C
C
0.0 °C
100.0 °C
2315.0 °C
2500.0 °C
±0.7 °C
±2.7 °C
TXK / XK(L)
-200.0 °C
-150.0 °C
800.0 °C
1050.0 °C
±0.6 °C
±1.2 °C
Voltage -32512 -27648
-80 mV
27648
80 mV
32511 ±0.05% ±0.1%
1
Thermocouple values below the under-range minimum value are reported as -32768.
2
Thermocouple values above the over-range minimum value are reported as 32767.
3
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
minutes of warm-up time to meet this specification.
4
For the 4-channel SM TC only: In the presence of radiated radio frequency of 970 MHz to 990 MHz, the accuracy may
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).
A.8.6
Thermocouple filter selection and update times
For measuring thermocouples, it is recommended that a 100 ms integration time be used.
The use of smaller integration times will increase the repeatability error of the temperature
readings.
Table A- 55 Thermocouple filter selection and update times
Rejection frequency
(Hz)
Integration time
(ms)
Update time (seconds)
1-channel SB
4-channel SM
8-channel SM
10
100
0.301
1.225
2.450
50
20
0.061
0.263
0.525
60 16.67 0.051 0.223 0.445
400
1
10
0.031
0.143
0.285
1
To maintain module resolution and accuracy when 400 Hz rejection is selected, the integration time is 10 ms. This
selection also rejects 100 Hz and 200 Hz noise.