Eight Analog Input Channels
The Siemens 6ES7 331-7KF02-0AB0 SM 331 module provides eight analog inputs for connecting compatible industrial measurement devices to a SIMATIC S7-300 automation system.
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SIEMENS
Siemens 6ES7 331-7KF02-0AB0 S7-300 SM331 Analog Input Module
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PRODUCT DOCUMENTATION
Product Information
Technical specifications, features, applications and purchasing information.
Technical Specifications
| Brand | Siemens |
| Model Number | 6ES7 331-7KF02-0AB0 |
| Manufacturer Article Number | 6ES7331-7KF02-0AB0 |
| Product Category | Analog Input Module |
| Product Family | SIMATIC S7-300 |
| Module Designation | SM 331 |
| Number of Analog Inputs | 8 |
| Channels for Resistance Measurement | 4 |
| Supported Measurement Types | Voltage, Current, Thermocouple, Resistance Thermometer and Resistance |
| Measurement Resolution | 9 / 12 / 14 Bits, Depending on Configuration |
| Nominal Load Supply Voltage | 24 VDC |
| Load Supply Current | 30 mA Maximum Without Load |
| Backplane Current | 50 mA Maximum at 5 VDC |
| Typical Power Dissipation | 1 W |
| Voltage Input Ranges | Includes 1–5 VDC, ±1 VDC, ±2.5 VDC, ±5 VDC and ±10 VDC |
| Current Input Ranges | Includes 0–20 mA, 4–20 mA and Bipolar Current Ranges |
| Thermocouple Measurement | Supported; Verify Configured Sensor Type |
| Resistance Thermometer Measurement | Supported; Verify Sensor and Wiring Configuration |
| Electrical Isolation | Isolated Analog Input Module |
| Parameterizable Integration Times | 2.5 / 16.67 / 20 / 100 ms |
| Basic Conversion Times | 3 / 17 / 22 / 102 ms |
| Diagnostics | Supported |
| Process Alarm Functions | Supported |
| Front Connector | 20-Pole |
| Module Installation | SIMATIC S7-300 Rack |
| Replacement Under Voltage | Possible with Active Backplane Bus and Applicable System Configuration |
| Net Weight | 0.288 kg |
| EAN | 4025515066835 |
| Manufacturer UPC | 662643177909 |
| Country of Origin | Germany |
| Product Lifecycle | Phase-Out Announced Since October 1, 2023; Verify Current Spare-Part Status |
Key Features
Multiple Signal Types
The module supports voltage, current, thermocouple, resistance thermometer and resistance measurements. Resistance measurement uses up to four channels depending on the configuration.
Configurable Measurement Resolution
Selectable measurement settings provide 9-bit, 12-bit or 14-bit resolution depending on the configured measurement and conversion parameters.
Integrated Diagnostic Functions
Diagnostic and process alarm functions support the monitoring of configured measurement channels and fault conditions within the automation system.
24 VDC Supply
The SM 331 module uses a nominal 24 VDC load supply and draws power from the S7-300 backplane. Siemens specifies approximately 1 W of typical module power dissipation.
S7-300 System Integration
The isolated analog input module uses a 20-pole front connector and is designed for the SIMATIC S7-300 platform, including applicable installations using an active backplane bus.
Applications
- SIMATIC S7-300 PLC analog input expansion
- Industrial temperature measurement systems
- Pressure transmitter signal acquisition
- Flow and liquid level monitoring
- Thermocouple and RTD temperature sensing
- Manufacturing process monitoring
- Industrial machine sensor integration
- Existing S7-300 control system maintenance and replacement
Purchase Information
We support online purchase of the Siemens 6ES7 331-7KF02-0AB0 Analog Input Module. If you need to make bulk purchases and inquire about other products, please contact our team to inform us of your purchase requirements. We will provide you with information such as quantity quotations, delivery dates, and transportation methods.
Frequently Asked Questions
What is Siemens 6ES7 331-7KF02-0AB0?
It is a SIMATIC S7-300 SM 331 isolated analog input module with eight analog input channels. Siemens also writes the complete article number as 6ES7331-7KF02-0AB0.
How many analog inputs does the module provide?
It provides eight analog input channels. Up to four channels can be used for resistance measurement according to the configured measurement arrangement.
Which input signal types are supported?
The module supports voltage, current, thermocouple, resistance thermometer and resistance measurements.
Can it receive 4–20 mA signals?
Yes. The supported current measurement ranges include 4–20 mA. The appropriate measurement range and transmitter wiring must be configured.
Does this module support thermocouples?
Yes. Thermocouple measurement is supported. Verify the specific sensor type, compensation method and channel configuration against Siemens technical documentation.
Can it connect to RTD temperature sensors?
Yes. Resistance thermometer measurement is supported, subject to the selected sensor type and required connection method.
What is the analog resolution?
Siemens specifies configurable resolution options of 9, 12 and 14 bits, depending on the selected measurement parameters.
What power supply does it require?
The module uses a nominal 24 VDC load supply and also draws current from the SIMATIC S7-300 backplane.
What front connector is required?
The module uses a 20-pole front connector. Confirm the connector and existing terminal wiring before purchasing a replacement.
Does the module provide diagnostic functions?
Yes. Siemens specifies diagnostic and alarm functions for this SM 331 analog input module.
Can it replace another S7-300 SM 331 module?
Do not assume interchangeability. Verify the complete Siemens article number, input types, signal ranges, resolution, front connector, hardware configuration and controller program.
What should be checked before ordering?
Confirm Siemens article number 6ES7331-7KF02-0AB0, S7-300 system compatibility, eight analog inputs, configured measurement types, 24 VDC supply, required 20-pole connector, sensor wiring and project configuration.
Need help confirming a model?
Send us your part number and technical requirements.
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