Analog modules
6.8 Analog input module SM 331; AI 2 x 12 bit; (6ES7331-7KB02-0AB0)
S7-300 Automation System Module data
6-70 Manual, 08/2006, A5E00105505-04
Selected measuring method Measuring range
(type of sensor)
Measuring range module settings
TC-IL: Thermocouples (linear, internal
comparison)
(temperature measurement)
Type N [NiCrSi-NiSi]
Type E [NiCr-CuNi]
Type J [Fe-CuNi]
Type K [NiCr-Ni]
Type L [Fe-CuNi]
A
TC-EL: Thermocouples
(linear, external comparison)
(temperature measurement)
Type N [NiCrSi-NiSi]
Type E [NiCr-CuNi]
Type J [Fe-CuNi]
Type K [NiCr-Ni]
Type L [Fe-CuNi]
A
RTD-4L: Thermal resistance
(linear, 4-wire connection) (temperature
measurement)
Pt 100 Klima
Ni 100 Klima
Pt 100 Standard
Ni 100 Standard
A
Channel groups
Two channels of SM 331; AI 2 x 12 Bit form a channel group. You can only assign
parameters to the channel group.
SM 331; AI 2 x 12 Bit is equipped with a measuring range module for channel group 0.
Wirebreak monitoring
The wire-break check function is designed only for temperature measurements
(thermocouples and thermoresistors.)
Special features of the wire-break check function in the 4 mA to 20 mA measuring range
If you configured a measuring range of 4 mA to 20 mA, and enabled wire-break check, the
analog input module logs a wire-break event in diagnostics data when the current drops
below 3.6 mA.
The module also triggers a diagnostic interrupt if you enabled diagnostics interrupts in the
program.
The lit SF LED is otherwise the only indication of the wire-break, and you must evaluate the
diagnostic bytes in the user program.
If you configured a measuring range of 4 mA to 20 mA, disabled wire-break check, and
enabled diagnostic interrupts, the module triggers a diagnostic interrupt when the underflow
value is reached.
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