Siemens SIMATIC S7 System Manual page 156

PLC device configuration
6.1 Configuring the operation of the PLC system
Scale
You configure a temperature scale for the channel, choosing one of the following options:
● Celsius
● Fahrenheit
Note
For the "Resistance 4-wire", "Resistance 3-wire", and "Resistance 2-wire" RTD types and
associated resistors, you cannot configure temperature coefficients or temperature
scales.
Rejection
Fluctuations in RTD analog input values can also be caused by the response time of the
sensor, or the length and condition of the wires carrying the RTD analog signal to the
module. In such cases, the fluctuating values could be changing too rapidly for the program
logic to respond effectively. You can configure the module to reject signals to eliminate or
minimize noise at the following frequencies:
● 10 Hz
● 50 Hz
● 60 Hz
● 400 Hz
Smoothing
You can also configure the module to smooth the RTD analog input signal over a configured
number of cycles, thus presenting an averaged value to the program logic. You have four
choices for the smoothing algorithm:
● None
● Weak
● Medium
● Strong
156
System Manual, V2.3, 07/2017, A5E03822230-AF
S7-200 SMART