6ES7331-7KF02-0AB0 SIEMENS

6ES7331-7KF02-0AB0 SIEMENS Basis unit

Product  Description：

The 6ES7331-7KF02-0AB0 is an isolated 8-channel analog input module (SM 331). It is capable of converting analog signals from the process into digital values for the S7-300 CPU. The module is particularly noted for its flexibility, as it can be configured to read voltage, current, resistance, and temperature via thermocouples or resistance thermometers (RTDs). Each channel is electrically isolated from the backplane bus, ensuring high signal integrity and protection for the central controller. It requires a 20-pin front connector for wiring.

Product Parameters

• Number of Inputs: 8 analog inputs.

• Resolution: Adjustable at 9, 12, or 14 bits depending on the integration time and interference frequency suppression settings.

• Input Ranges (Voltage): $\pm 80 \text{ mV}$, $\pm 250 \text{ mV}$, $\pm 500 \text{ mV}$, $\pm 1 \text{ V}$, $\pm 2.5 \text{ V}$, $\pm 5 \text{ V}$, $1 \text{ V to } 5 \text{ V}$, and $\pm 10 \text{ V}$.

• Input Ranges (Current): $\pm 3.2 \text{ mA}$, $\pm 10 \text{ mA}$, $0 \text{ to } 20 \text{ mA}$, $4 \text{ to } 20 \text{ mA}$, and $\pm 20 \text{ mA}$.

• Temperature Sensors: Supports Thermocouples (Types E, N, J, K, L, S, R, T, U) and Resistance Thermometers (Pt100, Ni100).

• Supply Voltage: $24 \text{ V DC}$ rated value with reverse polarity protection.

• Current Consumption: Maximum $30 \text{ mA}$ from load voltage $L+$ and maximum $50 \text{ mA}$ from the backplane bus.

• Power Loss: Typically $1 \text{ W}$.

• Isolation: Tested at $500 \text{ V DC}$ between channels and backplane bus.

• Cable Length: Maximum $200 \text{ m}$ (shielded), or $50 \text{ m}$ for $80 \text{ mV}$ and thermocouples.

• Dimensions: $40 \text{ mm}$ (Width) $\times 125 \text{ mm}$ (Height) $\times 117 \text{ mm}$ (Depth).

Product Advantages

• High Versatility: A single module can handle multiple signal types (U/I/TC/RTD), which reduces the variety of spare parts needed in inventory.

• Integrated Diagnostics: The module provides extensive diagnostic capabilities, including wire-break detection, overflow/underflow monitoring, and power supply loss alerts.

• Configurable Filtering: Users can adjust the integration time to suppress power line interference (50 Hz or 60 Hz), allowing for stable readings in noisy electrical environments.

• Hot Swapping: When used with an active backplane bus, this module supports removal and insertion during operation, minimizing system downtime during maintenance.

• Robust Isolation: The electrical isolation between the inputs and the internal bus protects the PLC from high-voltage transients on the field side.

Important Considerations (Precautions)

• Front Connector: The module is sold without the 20-pin front connector. This must be ordered separately (e.g., 6ES7392-1AJ00-0AA0 for screw terminals).

• Measuring Range Modules: The side-mounted range cards (cubes) must be positioned correctly (A, B, C, or D) to match the programmed input type. Incorrect positioning can lead to inaccurate readings or hardware damage.

• Grounding: To ensure maximum noise immunity, the cable shields should be grounded at both the module and the sensor side whenever possible.

• Power Supply: Always ensure the $24 \text{ V DC}$ supply is stable. A loss of this supply will trigger a diagnostic interrupt if configured.

• Lifecycle Note: As of late 2025, this product has reached "Product Cancellation" status (PM410) in the Siemens lifecycle. It is primarily available as a spare part, and migration to newer systems like S7-1500 is recommended for new projects.

Product Applications

• Process Control: Monitoring pressure transmitters, flow meters, and level sensors in chemical or water treatment plants.

• Temperature Monitoring: Directly connecting thermocouples or Pt100 sensors in ovens, furnaces, or climate control systems without needing external transmitters.

• Machine Automation: Integrating analog feedback from hydraulic systems or high-precision position sensors.

• Environmental Data Logging: Recording voltage or current signals from specialized environmental sensors in research or utility facilities.

The structure and details of the product：

Our services：

Shipping Port:  China

Payment: Bank of Chicago, Bank of Singapore

Express cooperation: fedex, DHL, UPS and your express account

Service: Professional Sales provides 24 hours /7 days online service

Warranty: one year

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