6ES7331-7KB02-0AB0
Siemens SM 331 analog input, 2 AI, U/I/thermocouple/resistance
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Siemens SIMATIC S7-300 SM 331 analog input module: 2 isolated inputs for voltage, current, thermocouple and resistance, 9/12/14-bit resolution, alarm and diagnostics, 20-pole front connector.
- Manufacturer
- Siemens
- Manufacturer part no.
- 6ES7331-7KB02-0AB0
- Product family
- SIMATIC S7-300 PLC Modules
- Type
- Analog module
- Lifecycle
- Discontinued: product cancellation (Siemens SiePortal), spare part only
- OEM successor
- Not stated
- Technical datasheet
- Data sheet
Technical specifications
- Manufacturer
- Siemens
- Manufacturer part no.
- 6ES7331-7KB02-0AB0
- Type
- Analog module
- Application
- Analog I/O module
- Used with
- SIMATIC S7-300 rack (S7-300 backplane bus)
- Product function / Isochronous mode
- No
- Load voltage L+ / Rated value (DC)
- 24 V
- Load voltage L+ / Reverse polarity protection
- Yes
- Input current / from load voltage L+ (without load), max.
- 30 mA
- Input current / from backplane bus 5 V DC, max.
- 50 mA
- Power loss, typ.
- 1 W
- Number of analog inputs
- 2
- Number of analog inputs / For resistance measurement
- 1
- Analog inputs / permissible input voltage for voltage input (destruction limit), max.
- 20 V; continuous; 75 V for max. 1 s (mark to space ratio 1:20)
- Analog inputs / permissible input current for current input (destruction limit), max.
- 40 mA
- Analog inputs / Constant measurement current for resistance-type transmitter, typ.
- 1.67 mA
- Input ranges / Voltage
- Yes
- Input ranges / Current
- Yes
- Input ranges / Thermocouple
- Yes
- Input ranges / Resistance thermometer
- Yes
- Input ranges / Resistance
- Yes
- Input ranges (rated values), voltages / 0 to +10 V
- No
- Input ranges (rated values), voltages / 1 V to 5 V
- Yes
- Input ranges (rated values), voltages / 1 V to 5 V / Input resistance (1 V to 5 V)
- 100 kΩ
- Input ranges (rated values), voltages / 1 V to 10 V
- No
- Input ranges (rated values), voltages / -1 V to +1 V
- Yes
- Input ranges (rated values), voltages / -1 V to +1 V / Input resistance (-1 V to +1 V)
- 10 MΩ
- Input ranges (rated values), voltages / -10 V to +10 V
- Yes
- Input ranges (rated values), voltages / -10 V to +10 V / Input resistance (-10 V to +10 V)
- 100 kΩ
- Input ranges (rated values), voltages / -2.5 V to +2.5 V
- Yes
Show all 123 specificationsShow fewer
- Input ranges (rated values), voltages / -2.5 V to +2.5 V / Input resistance (-2.5 V to +2.5 V)
- 100 kΩ
- Input ranges (rated values), voltages / -250 mV to +250 mV
- Yes
- Input ranges (rated values), voltages / -250 mV to +250 mV / Input resistance (-250 mV to +250 mV)
- 10 MΩ
- Input ranges (rated values), voltages / -5 V to +5 V
- Yes
- Input ranges (rated values), voltages / -5 V to +5 V / Input resistance (-5 V to +5 V)
- 100 kΩ
- Input ranges (rated values), voltages / -50 mV to +50 mV
- No
- Input ranges (rated values), voltages / -500 mV to +500 mV
- Yes
- Input ranges (rated values), voltages / -500 mV to +500 mV / Input resistance (-500 mV to +500 mV)
- 10 MΩ
- Input ranges (rated values), voltages / -80 mV to +80 mV
- Yes
- Input ranges (rated values), voltages / -80 mV to +80 mV / Input resistance (-80 mV to +80 mV)
- 10 MΩ
- Input ranges (rated values), currents / 0 to 20 mA
- Yes
- Input ranges (rated values), currents / 0 to 20 mA / Input resistance (0 to 20 mA)
- 25 Ω
- Input ranges (rated values), currents / -10 mA to +10 mA
- Yes
- Input ranges (rated values), currents / -10 mA to +10 mA / Input resistance (-10 mA to +10 mA)
- 25 Ω
- Input ranges (rated values), currents / -20 mA to +20 mA
- Yes
- Input ranges (rated values), currents / -20 mA to +20 mA / Input resistance (-20 mA to +20 mA)
- 25 Ω
- Input ranges (rated values), currents / -3.2 mA to +3.2 mA
- Yes
- Input ranges (rated values), currents / -3.2 mA to +3.2 mA / Input resistance (-3.2 mA to +3.2 mA)
- 25 Ω
- Input ranges (rated values), currents / 4 mA to 20 mA
- Yes
- Input ranges (rated values), currents / 4 mA to 20 mA / Input resistance (4 mA to 20 mA)
- 25 Ω
- Input ranges (rated values), thermocouples / Type B
- No
- Input ranges (rated values), thermocouples / Type E
- Yes
- Input ranges (rated values), thermocouples / Type E / Input resistance (Type E)
- 10 MΩ
- Input ranges (rated values), thermocouples / Type J
- Yes
- Input ranges (rated values), thermocouples / Type J / Input resistance (type J)
- 10 MΩ
- Input ranges (rated values), thermocouples / Type K
- Yes
- Input ranges (rated values), thermocouples / Type K / Input resistance (Type K)
- 10 MΩ
- Input ranges (rated values), thermocouples / Type L
- No
- Input ranges (rated values), thermocouples / Type N
- Yes
- Input ranges (rated values), thermocouples / Type N / Input resistance (Type N)
- 10 MΩ
- Input ranges (rated values), thermocouples / Type R
- No
- Input ranges (rated values), thermocouples / Type S
- No
- Input ranges (rated values), thermocouples / Type T
- No
- Input ranges (rated values), thermocouples / Type U
- No
- Input ranges (rated values), thermocouples / Type TXK/TXK(L) to GOST
- No
- Input ranges (rated values), resistance thermometer / Cu 10
- No
- Input ranges (rated values), resistance thermometer / Ni 100
- Yes
- Input ranges (rated values), resistance thermometer / Ni 100 / Input resistance (Ni 100)
- 10 MΩ; Standard
- Input ranges (rated values), resistance thermometer / Ni 1000
- No
- Input ranges (rated values), resistance thermometer / LG-Ni 1000
- No
- Input ranges (rated values), resistance thermometer / Ni 120
- No
- Input ranges (rated values), resistance thermometer / Ni 200
- No
- Input ranges (rated values), resistance thermometer / Ni 500
- No
- Input ranges (rated values), resistance thermometer / Pt 100
- Yes
- Input ranges (rated values), resistance thermometer / Pt 100 / Input resistance (Pt 100)
- 10 kΩ; Standard
- Input ranges (rated values), resistance thermometer / Pt 1000
- No
- Input ranges (rated values), resistance thermometer / Pt 200
- No
- Input ranges (rated values), resistance thermometer / Pt 500
- No
- Input ranges (rated values), resistors / 0 to 150 ohms
- Yes
- Input ranges (rated values), resistors / 0 to 150 ohms / Input resistance (0 to 150 ohms)
- 10 MΩ
- Input ranges (rated values), resistors / 0 to 300 ohms
- Yes
- Input ranges (rated values), resistors / 0 to 300 ohms / Input resistance (0 to 300 ohms)
- 10 MΩ
- Input ranges (rated values), resistors / 0 to 600 ohms
- Yes
- Input ranges (rated values), resistors / 0 to 600 ohms / Input resistance (0 to 600 ohms)
- 10 MΩ
- Input ranges (rated values), resistors / 0 to 6000 ohms
- No
- Thermocouple (TC) / Temperature compensation / Parameterizable
- Yes
- Thermocouple (TC) / Temperature compensation / internal temperature compensation
- Yes
- Thermocouple (TC) / Temperature compensation / external temperature compensation with compensations socket
- Yes
- Thermocouple (TC) / Temperature compensation / for definable comparison point temperature
- Yes
- Thermocouple (TC) / Characteristic linearization / Parameterizable
- Yes
- Thermocouple (TC) / Characteristic linearization / Parameterizable / for thermocouples
- Type E, J, K, L, N
- Thermocouple (TC) / Characteristic linearization / Parameterizable / for resistance thermometer
- Pt100 (standard, climatic range), Ni100 (standard, climatic range)
- Thermocouple (TC) / Cable length / shielded, max.
- 200 m; 50 m at 80 mV and thermocouples
- Integration and conversion time/resolution per channel / Resolution with overrange (bit including sign), max.
- 15 bit; Unipolar: 9/12/12/14 bit; bipolar: 9 bit + sign/12 bit + sign/12 bit + sign/14 bit + sign
- Integration and conversion time/resolution per channel / Integration time, parameterizable
- Yes; 2,5 / 16,67 / 20 / 100 ms
- Integration and conversion time/resolution per channel / Basic conversion time (ms)
- 3 / 17 / 22 / 102 ms
- Integration and conversion time/resolution per channel / Interference voltage suppression for interference frequency f1 in Hz
- 400 / 60 / 50 / 10 Hz
- Connection of signal encoders / for voltage measurement
- Yes
- Connection of signal encoders / for current measurement as 2-wire transducer
- Yes
- Connection of signal encoders / for current measurement as 4-wire transducer
- Yes
- Connection of signal encoders / for resistance measurement with two-wire connection
- Yes
- Connection of signal encoders / for resistance measurement with three-wire connection
- Yes
- Connection of signal encoders / for resistance measurement with four-wire connection
- Yes
- Operational error limit in overall temperature range / Voltage, relative to input range, (+/-)
- 1 %; ±1% (80 mV); ±0.6% (250 mV to 1 000 mV); ±0.8% (2.5 V to 10 V)
- Operational error limit in overall temperature range / Current, relative to input range, (+/-)
- 0.7 %; From 3.2 to 20 mA
- Operational error limit in overall temperature range / Resistance, relative to input range, (+/-)
- 0.7 %; 150, 300, 600 Ohm
- Operational error limit in overall temperature range / Resistance thermometer, relative to input range, (+/-)
- 0.7 %; ±0.7 % (Pt100/ Ni100); ±0.8 % (Pt100 climate)
- Operational error limit in overall temperature range / Thermocouple, relative to input range, (+/-)
- 1.1 %; Type E, J, K, L, N
- Basic error limit (operational limit at 25 °C) / Voltage, relative to input range, (+/-)
- 0.6 %; ±0.6% (80 mV, 2.5 V to 10 V); ±0.4% (250 mV to 1 000 mV)
- Basic error limit (operational limit at 25 °C) / Current, relative to input range, (+/-)
- 0.5 %; 3.2 to 20 mA
- Basic error limit (operational limit at 25 °C) / Resistance, relative to input range, (+/-)
- 0.5 %; 150, 300, 600 Ohm
- Basic error limit (operational limit at 25 °C) / Resistance thermometer, relative to input range, (+/-)
- 0.6 %; ±0.5% (Pt100/ Ni100), ±0.6% (Pt100 climate)
- Basic error limit (operational limit at 25 °C) / Thermocouple, relative to input range, (+/-)
- 0.7 %; Type E, N, J, K, L
- Interrupts/diagnostics/status information / Diagnostics function
- Yes; Parameterizable
- Alarms / Diagnostic alarm
- Yes
- Alarms / Limit value alarm
- Yes; Parameterizable, channel 0
- Diagnoses / Diagnostic information readable
- Yes
- Diagnostics indication LED / Group error SF (red)
- Yes
- Potential separation analog inputs / between the channels
- No
- Potential separation analog inputs / between the channels and backplane bus
- Yes
- Potential separation analog inputs / between the channels and the power supply of the electronics
- Yes; Not for 2-wire transmitters
- Isolation tested with
- 500 V DC
- required front connector
- 20-pin
Technical documents (1)
Key features
- 2 analog inputs: voltage, current, thermocouple and resistance
- Resolution 9, 12 or 14 bit (15 bit including sign)
- Alarms and diagnostics
- Isolated; 20-pin front connector
- Discontinued by Siemens on 1 October 2025; spare part only
About the Siemens 6ES7331-7KB02-0AB0
The Siemens 6ES7331-7KB02-0AB0 is the two-channel SM 331 analog input module. Siemens's data sheet lists voltage, current, thermocouple and resistance ranges, a resolution of 9, 12 or 14 bits depending on the integration time, alarms and diagnostics, and a 20-pin front connector. Siemens's data sheet marks it as a spare part. Siemens names no direct successor for the order number; its route forward is migration to the S7-1500 with ET 200MP.
What is the 6ES7331-7KB02-0AB0 used for?
It brings a small number of process values into an S7-300, such as a temperature from a thermocouple or a 4-20 mA transmitter signal.
Lifecycle and successor
Discontinued: product cancellation (Siemens SiePortal), spare part only.
Before you order
What to photograph or confirm so the right unit is quoted.
Check the order number on the module and note which range each input uses, so the replacement is set up the same way.
Alternatives for 6ES7331-7KB02-0AB0
The manufacturer’s named successor and other parts in the same family. None is a drop-in replacement without checking wiring, I/O and configuration for your installation.
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