Siemens SIMATIC Manual page 352

Analog modules
6.6 Analog input module SM 331; AI 8 x 13 Bit; (6ES7331-1KF02-0AB0)
● Notes on programming
Note
Only bits 0 and 2 in the process image input are relevant for evaluation. You can use bits
0 and 2 to monitor the temperature of a motor, for example.
Bits 0 and 2 in the process image input cannot be saved. When assigning parameters,
make sure that the motor, for example, starts up in a controlled manner (by means of an
acknowledgment).
Bits 0 and 2 can never be set at the same time; they are set one after the other.
Using silicon temperature sensors
Silicon temperature sensors are commonly used to detect temperatures in motors.
● When assigning the parameters, select measurement type "thermoresistor" and
measuring range "KTY83/110" or "KTY84/130".
● Connect the temperature sensor (see "Terminal diagram for resistance measurement").
Use temperature sensors which comply with the Product Specifications published by
Philips Semiconductors.
● KTY83 series (KTY83/110)
● KTY84 series (KTY84/130)
Also take note of the accuracy of the temperature sensors.
The temperature is specified in 0.1 degrees C, 0.1 degrees K, and/or 0.1 degrees F, see
section Representation of the values for analog input channels (Page 262).
352
S7-300 Module data
Manual, 06/2017, A5E00105505-AJ