Siemens S7-1200 System Manual page 961
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Also See for S7-1200:
- Operating instructions manual (132 pages) ,
- Programming manualline (74 pages) ,
- Manual (46 pages)
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Table A- 235 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
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.
Table A- 236 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.
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 available 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.
S7-1200 Programmable controller
System Manual, 03/2014, A5E02486680-AG
Nominal range
low limit
0 (0 Ω)
0 (0 Ω)
0 (0 Ω)
Integration time
4-/2-wire, 1-channel module
10 ms
1
16.67 ms
20 ms
100 ms
Nominal range
Over range
high limit
maximum
27648 (150 Ω)
176.383 Ω
27648 (300 Ω)
352.767 Ω
27648 (600 Ω)
705.534 Ω
Update time (seconds)
0.036
0.056
0.066
0.306
Technical specifications
A.12 Analog signal boards (SBs)
Normal range
accuracy
1
@ 25 °C
±0.05%
±0.05%
±0.05%
3-wire, 1-channel module
Update time (seconds)
0.071
0.111
1.086
0.611
Normal range
accuracy
-20 °C to 60 °C
±0.1%
±0.1%
±0.1%
961
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