Siemens Simatic S7 Series

Technical specifications
A.5 Thermocouple and RTD expansion modules (EMs)
S7-200 SMART
System Manual, 09/2015, A5E03822230-AC
635
Table A- 121 Noise reduction and update times for the RTD module
Rejection frequency selection
Integration time
Update time (seconds)
400 Hz (2.5 ms) 10 ms
1
4-/2-wire: 0.142
3-wire: 0.285
60 Hz (16.6 ms) 16.67 ms 4-/2-wire: 0.222
3-wire: 0.445
50 Hz (20 ms) 20 ms 4-/2-wire: 0.262
3-wire: .505
10 Hz (100 ms) 100 ms 4-/2-wire: 1.222
3-wire: 2.445
1
To maintain module resolution and accuracy when the 400 Hz filter is selected, the integration time is 10 ms. This selec-
tion 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 modul
e.