Technical specifications
A.9 Thermocouple and RTD signal modules (SMs)
S7-1200 Programmable controller
930 System Manual, 03/2014, A5E02486680-AG
Table A- 180 Noise reduction and update times for the RTD modules
Rejection frequency
selection
400 Hz (2.5 ms) 10 ms
1
4-/2-wire: 0.142
4-/2-wire: 0.285
3-wire: 0.525
60 Hz (16.6 ms) 16.67 ms 4-/2-wire: 0.222
4-/2-wire: 0.445
50 Hz (20 ms) 20 ms 4-/2-wire: 0.262
4-/2-wire: 0.524
10 Hz (100 ms) 100 ms 4-/2-wire: 1.222
4-/2-wire: 2.425
To maintain module resolution and accuracy when the 400 Hz filter is selected, the integration time is 10 ms. This
selection also rejects 100 Hz and 200 Hz noise.
Note
After power is applied, the module performs internal calibration for the analog
-to-digital
converter. During this time the module reports a value of 32767 on each channel until valid
data is avail
able on that channel. Your user program may need to allow for this initialization
time. Because the configuration of the module can vary the length of the initialization time,
you should verify the behavior or the module in your configuration. If required,
you can
include logic in your user program to accommodate the initialization time of the module.
Representation of Analog values for RTDs
A representation of the digitized measured value for the RTD standard temperature range
sensors are shown in the tables below.
Table A- 181 Representation of analog values for resistance thermometers PT 100, 200, 500, 1000
and PT 10, 50, 100, 500 GOST (0.003850) standard
Pt x00
standard in
°C (1 digit =
0.1 °C)
Pt x00
standard in
°F (1 digit =
0.1 °F)
1000.0
:
10000
:
2710
:
1832.0
:
18320
:
4790
:
Overrange
850.0
:
8500
:
2134
:
1562.0
:
15620
:
3D04
:
Rated range
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