8 Inputs SIMATIC S7 300 Safety PLC 6ES7331-1KF02-0AB0 SM 331

SIMATIC S7-300 PLC 6ES7331-1KF02-0AB0 SM 331

I. Product Description:

The SIMATIC 6ES7331-1KF02-0AB0 is an analog input module from the SIMATIC SIMATIC S7-300 series, commonly referred to as the SM 331. It is primarily used to convert analog signals from field devices—such as voltage, current, resistance, or thermoresistor signals—into digital values that can be processed internally by the PLC

It features 8 analog input channels and supports voltage, current, resistance, and thermoresistor signals such as Pt100 and Ni100; however, it cannot be directly con nected to thermocouples.

II. Product Specifications:

SIMATIC 6ES7331-1KF02-0AB0｜SIMATIC S7-300 SM 331 Analog Input Module

Resolution: 9, 12, or 14 bit, depending on configured integration time;
Rated Supply Voltage: 24 V DC;
Permitted Supply Voltage Range: 20.4 to 28.8 V DC;
Voltage Input Ranges: 1 to 5 V, ±1 V, ±2.5 V, ±5 V, ±10 V, ±80 mV, ±250 mV, ±500 mV;
Current Input Ranges: 0 to 20 mA, 4 to 20 mA, ±10 mA, ±20 mA;
Thermocouple Measurement: Supported;
Supported Thermocouple Types: Types B, E, J, K, L, N, R, S, T, U;
Resistance Thermometer Measurement: Supported;
Supported Resistance Thermometer Types: Pt100 and Ni100;
Resistance Measurement: Supported;
Resistance Measurement Ranges: 0 to 150 Ω and 0 to 300 Ω;
Maximum Permissible Input Voltage: 20 V continuous, 75 V for up to 1 second;
Maximum Permissible Input Current: 40 mA;
Input Resistance for Voltage Signals: Approximately 100 kΩ for 1 to 5 V and ±10 V ranges;
Input Resistance for Low-Level Voltage Signals: Approximately 10 MΩ;
Input Resistance for Current Signals: Approximately 25 Ω;
Integration Time: 2.5 ms, 16.67 ms, 20 ms, or 100 ms, configurable;
Basic Conversion Time: Approximately 3 ms, 17 ms, 22 ms, or 102 ms, depending on integration time;
Interference Frequency Suppression: 10 Hz, 50 Hz, 60 Hz, and 400 Hz;
Diagnostic Functions: Programmable diagnostic functions supported;
Diagnostic Interrupt: Supported;
Limit Monitoring: Programmable limit monitoring supported;
Hardware Interrupt: Supported according to configured parameters;
Electrical Isolation: Analog inputs electrically isolated from the backplane bus;
Backplane Bus Current Consumption: Maximum 50 mA at 5 V DC;
Typical Power Loss: Approximately 1 W;
Front Connector: 20-pin front connector;
Hot-Swapping: Supported under specified system conditions;
Engineering Software: STEP 7 / TIA Portal;
Configuration: Parameterizable through the STEP 7 engineering environment;
System Compatibility: SIMATIC S7-300 automation systems;
Mounting: Installation on the S7-300 mounting rail;
Protection Rating: IP20;
Maximum Cable Length: Up to 200 m for shielded signal cables, depending on signal type and measurement configuration;
Dimensions (W × H × D): Approximately 40 × 125 × 120 mm;
Net Weight: Approximately 0.25 kg;
Typical Applications: Analog sensor signal acquisition, temperature measurement, thermocouple monitoring, resistance measurement, pressure measurement, flow measurement, process monitoring, industrial instrumentation, process control, and SIMATIC S7-300 automation systems

III. Technical Parameters:

SIMATIC S7-300, analog input SM 331, isolated 8 AI, resolution 13 bit U/I/resistance/Pt100, NI100, NI1000, LG-NI1000, PTC/KTY, 66 ms conversion time; 1x 40-pole

IV. Industries Served:

The most common application areas are manufacturing and the automotive industry. These modules can be used for real-time monitoring on production lines to control surface temperature, pressure, or liquid levels, ensuring stable process operations. In the food, chemical, and automotive manufacturing industries, they connect sensors and thermocouples to streamline automation processes and improve efficiency. They also serve as key control components in equipment such as light industrial machinery, packaging machinery, machine tools, lifting and transport equipment, and conveyor belt systems.

V. Why choose us?

We source directly from China’s Tier 1 channels, eliminating all middleman markups. This means you get competitive prices close to factory cost, and we pass those savings on to you as profit or budget flexibility for your projects.

Don’t let stockouts slow down your project schedule. For popular models like the S7-1500 and G120, which are frequently purchased, we always maintain high levels of in-stock inventory. The moment you place your order, the goods are already ready in our warehouse. Within 1–3 business days, you’ll receive the tracking number for your international express shipment. Whether your factory is in the Middle East, Southeast Asia, or across Europe and the Americas, our global logistics network helps you reclaim valuable time. 

From precision manufacturing in Europe to oil and gas fields in the Middle East, and electronics assembly lines in Southeast Asia, our products and solutions have withstood the test of demanding operating conditions around the world. We deeply understand the unique characteristics of each market, and this global experience is the guarantee of your project’s successful implementation.

VI. FAQ:

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