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Siemens 6ES7331-7KF02-0AB0 SIMATIC S7-300 Analog Input SM 331
The Siemens 6ES7331-7KF02-0AB0 is a SIMATIC S7-300 analog input module designed for multi-signal acquisition, accepting voltage, current, resistance, and thermocouple inputs across 8 isolated channels. It offers configurable 9/12/14-bit resolution with integrated linearization for thermocouples and supports 2-wire, 3-wire, and 4-wire transducer connections. Built on a standard 40-pin front connector, it mounts directly onto the S7-300 rack and is configured through STEP 7 hardware configuration.
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Categories: PLC I/O Modules
Description
The Siemens 6ES7331-7KF02-0AB0 SIMATIC S7-300 SM 331 AI 8×12 Bit analog input module provides eight input channels, with up to four channels configurable for resistive transducers. It supports a wide selection of voltage and current input ranges, including ±80 mV, ±250 mV, ±500 mV, ±1 V, ±2.5 V, ±5 V, 1–5 V, ±10 V, ±3.2 mA, ±10 mA, ±20 mA, 0–20 mA, and 4–20 mA, as well as 150 Ω, 300 Ω, 600 Ω resistance measurements, thermocouple types E, N, J, K, and L, and Pt100/Ni100 resistance thermometers. All eight channels are galvanically isolated from the backplane bus, ensuring reliable operation in noisy industrial environments.
The module uses an integrating measurement principle with programmable integration times of 2.5 ms, 16⅔ ms, 20 ms, and 100 ms, corresponding to resolutions from 9 to 14 bits. It provides programmable wire-break and diagnostic functions, process and diagnostic interrupts, internal and external temperature compensation, and electrical isolation between the analog channels and both the backplane bus and electronics power supply. Configuration and parameter assignment are performed seamlessly through STEP 7 hardware configuration, without the need for additional setup tools.
QTech Safety is a leading supplier of Siemens 6ES7331-7KF02-0AB0 SIMATIC S7-300 Analog Input Module in Ireland, offering competitive prices and fast worldwide shipping across United Kingdom (UK), Germany, France, Italy, Spain, United States USA, Canada, Mexico, and Western Australia (Perth). Buy Siemens PLC I/O Modules from one of Ireland’s most trusted industrial safety equipment suppliers.
Features of Siemens 6ES7331-7KF02-0AB0 SIMATIC S7-300 Analog Input SM 331
- Eight isolated analog input channels for flexible multi-signal acquisition
- Measurement of voltage, current, thermocouple, and resistance inputs
- Up to 14-bit resolution including overrange for high-accuracy readings
- Programmable integrating measurement principle for noise suppression
- 2-wire and 4-wire current transducer support
- Resistance measurement in 2-, 3-, and 4-wire configurations as applicable
- Thermocouple types E, N, J, K, and L supported
- Pt100 and Ni100 resistance thermometer compatibility
- Programmable internal and external temperature compensation
- Diagnostic and process interrupts for real-time monitoring
- Limit-value alarm capability for threshold-based alerts
- Diagnostic information readable by the CPU for streamlined troubleshooting
- Red SF group-error LED for quick fault indication
- Electrical isolation from backplane bus and electronics supply
- 20-pole front connector for secure wiring
- Supports removal and insertion with active backplane bus for hot-swap maintenance
Technical Specifications of Siemens 6ES7331-7KF02-0AB0
Product type: SM 331; AI 8 × 12 bit
Number of analog inputs: 8
Inputs for resistive transducers: 4
Measurement principle: Integrating
Programmable integration/conversion time: Yes
Integration times: 2.5 ms / 16⅔ ms / 20 ms / 100 ms
Resolution: 9 / 12 / 12 / 14 bit including overrange
Interference frequency suppression: 400 / 60 / 50 / 10 Hz
Measured-value smoothing: None
Rated electronics supply voltage: 24 V DC
Reverse polarity protection: Yes
Transducer supply: Short-circuit protected
Constant current for resistive transducers: Approx. 1.67 mA, pulsed
Isolation from backplane bus: Yes
Isolation from electronics power supply: Yes
Voltage input ranges: ±80 mV, ±250 mV, ±500 mV, ±1 V, ±2.5 V, ±5 V, 1–5 V, ±10 V
Current input ranges: ±3.2 mA, ±10 mA, ±20 mA, 0–20 mA, 4–20 mA
Resistance ranges: 150 Ω, 300 Ω, 600 Ω
Thermocouple types: E, N, J, K, L
Resistance thermometers: Pt100, Ni100
Voltage input impedance: 10 MΩ for low-voltage ranges; 100 kΩ for higher voltage ranges
Current input impedance: 25 Ω
Maximum voltage at voltage input: 20 V continuous; 75 V for max. 1 s at 1:20 duty ratio
Maximum current at current input: 40 mA
Maximum cable length: 200 m
Maximum shielded cable length: 50 m at 80 mV and with thermocouples
Operational error limit, voltage: ±1% for 80 mV; ±0.6% for 250 mV–1 V; ±0.8% for 2.5–10 V
Operational error limit, current: ±0.7%
Operational error limit, resistance: ±0.7%
Operational error limit, thermocouples E/N/J/K/L: ±1.1%
Operational error limit, Pt100/Ni100: ±0.7%
Temperature error: ±0.005%/K
Linearity error: ±0.05%
Repeat accuracy at 25°C: ±0.05%
Common-mode interference suppression: >70 dB
Series-mode interference suppression: >40 dB
Crosstalk between inputs: >50 dB
Temperature compensation: Programmable
Diagnostic functions: Programmable
Diagnostic interrupt: Supported
Process interrupt: Supported
Diagnostic LED: Red SF group-error LED
Required front connector: 20-pole
Dimensions (W × H × D): 40 × 125 × 117 mm
Weight: Approx. 250 g
Applications
The Siemens 6ES7331-7KF02-0AB0 SIMATIC S7-300 Analog Input SM 331 is commonly used in:
- Analog process measurement in SIMATIC S7-300 systems
- Voltage and current signal acquisition from industrial transmitters
- Temperature monitoring using supported thermocouples and RTDs
- Resistance measurement in process and machine applications
- Systems requiring electrically isolated analog inputs
- Legacy S7-300 installations requiring diagnostic and interrupt-capable analog input channels
Why Choose QTech Safety?
At QTech Safety, we’re more than just a safety supplier we’re your trusted partner in workplace protection and compliance.
Here’s why companies across UK and Ireland (EU) choose us for safety products and training:
- Comprehensive Range of Safety Equipment:
From gas detection and PPE to industrial safety tools, we offer one of the widest selections of trusted brands all at competitive Irish market prices. - Test & Measurement Instruments You Can Trust:
We supply a wide range of test and measurement instruments from the most leading and trusted brands, including industrial sensors, multimeters, oscilloscopes, accelerometers, proximity sensors, and other advanced measurement tools to support accurate diagnostics, condition monitoring, calibration, and maintenance applications. - Expert Health & Safety Training:
We provide professional health and safety training programmes designed to help your workforce stay compliant and confident on the job. - Fast, Reliable Delivery Worldwide:
Whether you’re in Texas United States or Perth Western Australia, our fast delivery service ensures you get your safety equipment quickly and efficiently. - Trusted by European Businesses:
We’re proud to support industries across Europe (UK) with certified safety solutions, expert advice, and responsive customer service.
We Ship Worldwide
At QTech Safety, we supply industrial sensors and instrumentation across Ireland, offering fast and reliable worldwide delivery. Through strong global logistics partnerships, we ensure efficient shipping and professional support for customers in Europe, North America, and Australia.
🡆 Europe (United Kingdom, Ireland, Germany, France, Italy, Spain, and the rest of European Union)
🡆 Australia (Western Australia WA, Queensland QLD, and New South Wales NSW)
🡆 North America (United States, Canada, Mexico)
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