Thermocouple Filter Selection And Update Times; Rtd Sensor Type Selection Table - Siemens SIMATIC S7-1200 Manual

Technical specifications
A.7 RTD and Thermocouple modules
Type Under range
minimum
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 warmup time to meet this specification.
For the 4-channel SM TC only: In the presence of radiated radio frequency of 970 MHz to 990 MHz, the accuracy may
4
be degraded.
A.7.6

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- 50 Thermocouple filter selection and update times
Rejection frequency
(Hz)
10
50
60
400
1
To maintain module resolution and accuracy when 400 Hz rejection is selected, the integration time is 10 ms. This
1
selection also rejects 100 Hz and 200 Hz noise.
A.7.7

RTD sensor type selection table

Table A- 51 Ranges and accuracy for the different sensors supported by the RTD modules
Temperature RTD type
coefficient
Pt 0.003850 Pt 10
ITS90
Pt 50
DIN EN 60751
Pt 100
Pt 200
Pt 500
268
Nominal
range low limit
1
-150.0°C
-27648
-80 mV
Integration time
(ms)
100
20
16.67
10
Under range
minimum
1
-243.0°C
-243.0°C
Nominal Over range
range high maximum
limit
800.0°C 1050.0°C
27648 32511
80 mV
Update time (seconds)
1-channel SB
0.301
0.061
0.051
0.031
Nominal Nominal
range range
low limit high limit
-200.0°C 850.0°C
-200.0°C 850.0°C
Normal range
3, 4
accuracy @ 25°C
2
±0.6°C
±0.05%
4-channel SM
1.225
0.263
0.223
0.143
Over range Normal
maximum range
2
accuracy @
25°C
1000.0°C ±1.0°C
1000.0°C ±0.5°C
Manual, 11/2011, A5E02486774-04
Normal range
3, 4
accuracy
0°C to 55°C
±1.2°C
±0.1%
8-channel SM
2.450
0.525
0.445
0.285
Normal
range
accuracy
0°C to 55°C
±2.0°C
±1.0°C
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