Rtd Filter Selection And Update Times - Siemens SIMATIC S7-1200 Manual

Table A- 57 Resistance
Range Under range
minimum
150 Ω n/a
300 Ω n/a
600 Ω n/a
Resistance values above the over-range maximum value are reported as 32767.
1
A.8.8

RTD filter selection and update times

Table A- 58 Filter selection and update times
Noise rejection
frequency (Hz)
10
50
60
400
1
To maintain module resolution and accuracy when the 400 Hz filter is selected, the integration time is 10 ms. This
1
selection also rejects 100 Hz and 200 Hz noise.
Note
The module reports 32767 on any activated channel with no sensor connected. If open wire
detection is also enabled, the module flashes the appropriate red LEDs.
Best accuracy will be achieved for the 10 Ω RTD ranges if 4 wire connections are used.
The resistance of the connection wires in 2 wire mode will cause an error in the sensor
reading and therefore accuracy is not guaranteed.
Easy Book
Manual, 03/2014, A5E02486774-AF
Nominal range
low limit
0 (0 Ω)
0 (0 Ω)
0 (0 Ω)
Integration time
(ms)
1-channel SB
100 4-/2-wire: 0.301
3-wire: 0.601
20 4-/2-wire: 0.061
3-wire: 0.121
16.67 4-/2-wire: 0.051
3-wire: 0.101
10 4-/2-wire: 0.031
3-wire: 0.061
Nominal range Over
high limit range
maximum
27648 (150 Ω) 176.383 Ω
27648 (300 Ω) 352.767 Ω
27648 (600 Ω) 705.534 Ω
Update time (seconds)
4-/2-wire: 1.222
3-wire: 2.445
4-/2-wire: 0.262
3-wire: .505
4-/2-wire: 0.222
3-wire: 0.424
4-/2-wire: 0.142
3-wire: 0.264
Technical specifications
A.8 RTD and Thermocouple modules
Normal range
accuracy
@ 25 °C
1
±0.05% ±0.1%
±0.05% ±0.1%
±0.05% ±0.1%
4-channel SM
4-/2-wire: 2.445
3-wire: 4.845
4-/2-wire: 0.525
3-wire: 1.015
4-/2-wire: 0.445
3-wire: 0.845
4-/2-wire: 0.285
3-wire: 0.525
Normal range
accuracy
-20 °C to 60 °C
8-channel SM
327