14bits 15bits SIMATIC S7 300 PLC 6ES7331-7KF02-0AB0 24VDC

SIMATIC S7-300 PLC 6ES7331-7KF02-0AB0 24 V DC

I. Product Description:

The SIMATIC 6ES7331-7KF02-0AB0 is a general-purpose analog input module (SM 331) from the SIMATIC S7-300 series. It provides 8 analog input channels, supports multiple signal types, and is a widely used analog acquisition module in S7-300 systems.

Number of input channels 8

Resolution 9/12/14/15 bits (configurable)

Supply Voltage 24 V DC

Backplane Bus Consumption 5 V DC, max. 50 mA

Cable Length Up to 200 m for shielded cable

II. Product Specifications:

SIMATIC 6ES7331-7KF02-0AB0｜SIMATIC S7-300 SM 331 Analog Input Module 

Resolution: 9/12/14 bits, configurable according to integration time;
Input Type: Isolated analog inputs;
Rated Supply Voltage: 24 V DC;
Reverse Polarity Protection: Supported;
Voltage Input Ranges: 1–5 V, ±1 V, ±2.5 V, ±5 V, ±10 V, ±80 mV, ±250 mV, ±500 mV;
Current Input Ranges: 0–20 mA, 4–20 mA, ±10 mA, ±20 mA;
Thermocouple Measurement: Supported;
Thermocouple Types: Types E, J, K, L, N;
Resistance Thermometer Measurement: Supported;
Resistance Thermometer Types: Pt100 and Ni100;
Resistance Measurement: Supported;
Resistance Measurement Ranges: 0–150 Ω and 0–300 Ω;
Maximum Permissible Input Voltage: 20 V continuous, 75 V for up to 1 second;
Maximum Permissible Input Current: 40 mA;
Constant Measurement Current for Resistance-Type Sensors: Approximately 1.67 mA;
Input Resistance for 1–5 V: 100 kΩ;
Input Resistance for ±10 V: 100 kΩ;
Input Resistance for ±1 V: 10 MΩ;
Input Resistance for ±80 mV: 10 MΩ;
Input Resistance for 0–20 mA: 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: Programmable diagnostic interrupt supported;
Limit Monitoring: Two channels with programmable limit monitoring;
Hardware Interrupt: Supported when configured limit values are exceeded;
Electrical Isolation: Inputs electrically isolated from the backplane bus;
Load Voltage Isolation: Inputs electrically isolated from the load voltage under specified configuration conditions;
Input Current from Load Voltage: Maximum 30 mA without external load;
Backplane Bus Current Consumption: Maximum 50 mA at 5 V DC;
Typical Power Loss: 1 W;
Front Connector: 20-pin front connector;
Hot-Swapping: Supports removing and inserting with an active backplane bus;
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, with shorter lengths applicable to thermocouple and low-voltage measurement ranges;
Dimensions (W × H × D): Approximately 40 × 125 × 120 mm;
Net Weight: Approximately 0.288 kg;
Typical Applications: Analog sensor signal acquisition, process measurement, temperature measurement, pressure measurement, flow measurement, resistance measurement, thermocouple monitoring, industrial instrumentation, process control, and SIMATIC S7-300 automation systems

III. Technical Parameters:

SIMATIC 6ES7331-7KF02-0AB0 S7-300, analog input SM 331, isolated, 8 AI, resolution 9/12/14 bits, U/I/thermocouple/resistor, alarm, diagnostics, 1x 20-pole removing/inserting with active backplane busIV. Industries Served:

The SIMATIC 6ES7331-7KF02-0AB0 module, as a general-purpose analog input module for the S7-300 system, is primarily used for the precise acquisition of process parameters such as temperature, pressure, and flow rate. It is mainly employed in industrial and infrastructure sectors with high requirements for process monitoring.

It is commonly used in control systems for industries such as chemicals, metallurgy, power generation, and cement.

Equipment and Production Line Automation: in machine tools, packaging machinery, lifting and transport equipment, and light industry/chemical conveying systems, among others.

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.

We don’t just sell products—we provide the technical support that keeps your equipment running smoothly. Whether you’re facing challenges with product selection, encountering commissioning errors, or dealing with unexpected failures, our technical team is always on standby to ensure your production line issues receive a professional response—not just a voicemail.

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