Siemens SIMATIC S7 System Manual page 718
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553BTechnical specifications
A.7 Thermocouple and RTD signal modules (SMs)
Table A- 105 Resistance
Range
Under range
minimum
150 Ω
n/a
300 Ω
n/a
600 Ω
n/a
RTD values below the under-range minimum value are reported as -32768.
1
RTD values above the over-range minimum value are reported as -32768.
2
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.
When 500 Ω and 1000 Ω RTD ranges are used with other lower value resistors, the error
may increase to two times the specified error.
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.
Table A- 106 Noise reduction and update times for the RTD modules
Rejection frequency
selection
400 Hz (2.5 ms)
60 Hz (16.6 ms)
50 Hz (20 ms)
10 Hz (100 ms)
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.
718
Nominal range
low limit
1
0 (0 Ω)
27648 (150 Ω)
0 (0 Ω)
27648 (300 Ω)
0 (0 Ω)
27648 (600 Ω)
Integration time
10 ms
1
16.67 ms
20 ms
100 ms
Nominal range
Over range
high limit
maximum
176.383 Ω
352.767 Ω
705.534 Ω
4-channel module
4-/2-wire: 0.142
3-wire: 0.285
4-/2-wire: 0.222
3-wire: 0.445
4-/2-wire: 0.262
3-wire: .505
4-/2-wire: 1.222
3-wire: 2.445
Normal range
accuracy
2
@ 25°C
±0.05%
±0.05%
±0.05%
Update time (seconds)
8-channel module
4-/2-wire: 0.285
3-wire: 0.525
4-/2-wire: 0.445
3-wire: 0.845
4-/2-wire: 0.524
3-wire: 1.015
4-/2-wire: 2.425
3-wire: 4.845
S7-1200 Programmable controller
System Manual, 11/2011, A5E02486680-05
Normal range
accuracy
0°C to 55°C
±0.1%
±0.1%
±0.1%
- Quick Links:
- Introducing the S7-1200 Plc
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