Analog Modules
4-150
Programmable Logic Controllers S7-300 Module Data
A5E00105505-03
4.24.2 Measuring Methods and Measuring Ranges of the SM 331;
AI 8 x TC
Measuring Methods
You can set the following measuring methods for the input channels:
• Thermocouple, linearization with reference temperature 0 °C
• Thermocouple, linearization with reference temperature 50 °C
• Thermocouples, linearization with internal comparison
• Thermocouple, linearization with external comparison
You perform the setting with the “measuring method” parameter in STEP 7.
Unused Channels
Set the “measuring method” parameter for unused channels to “disabled”. In this
way you shorten the scan time of the module.
You must terminate an unused channel in an enabled channel group to avoid
diagnostic errors for the unused channel. To do this, short the Plus input and Minus
input of the channel.
In the “4-Channel Hardware Filter” operating mode, termination is not necessary
provided that you have disabled the unused channel groups. Channels 1, 3, 5 and
7 are not monitored in this mode.
Measuring ranges
You perform setting of the measuring ranges with the “measuring range” parameter
in STEP 7.
Table 4-76 Measuring Ranges of the SM331; AI 8 x TC
Method Selected
Measuring Range Description
TC-L00C:
(thermocouple, linear,
reference temperature
0 °C)
TC-L50C:
(thermocouple, linear,
reference temperature
50 °C)
TC-IL:
(thermocouple, linear,
internal compensation)
TC-EL:
(thermocouple, linear,
external compensation)
Type B
Type C
Type E
Type J
Type K
Type L
Type N
Type R
Type S
Type T
Type U
You will find the digitized analog values
in Section 4.3.1 in the temperature range
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