Siemens 6ES7431-7KF00-0AB0 - Ultra-Precision 8-Channel Analog Input Module

Discover the high-performance Siemens 6ES7431-7KF00-0AB0 analog input module. This advanced card for the SIMATIC S7-400 PLC delivers exceptional measurement capabilities. It features 8 isolated channels with a remarkable 16-bit resolution. It is engineered for precision tasks, directly measuring voltage, current, and all major thermocouple types with integrated diagnostics.

Top Features & Benefits

• Superior Accuracy: 16-bit resolution and high accuracy (±0.1% for voltage) for critical measurements.
• Direct Thermocouple Input: Connects directly to Type B, E, J, K, R, S, T, and more without external transmitters.
• Advanced Diagnostics: Built-in monitoring for wire break, over-range, and limit alarms to prevent process issues.
• Flexible & Fast: Selectable integration times (2.5ms to 100ms) to optimize for speed or noise rejection.

Detailed Technical Specifications

Brand & Series: Siemens SIMATIC S7-400

Full Model Number: 6ES7431-7KF00-0AB0 (Analog Input SM 431)

Module Type: 8-Channel Analog Input, Isolated

Input Channels: 8, all channels isolated from each other

High Resolution: 16 bits (including sign)

Voltage Ranges: ±10V, ±5V, ±2.5V, ±1V, ±500mV, ±250mV, ±100mV, ±80mV, ±50mV, ±20mV, 1-5V

Current Ranges: ±20mA, 4-20mA, ±10mA, ±5mA, ±3.2mA, 0-20mA

Thermocouple Types: B, E, J, K, L, N, R, S, T, U

Basic Accuracy (at 25°C): ±0.1% (Voltage), ±0.17% (Current)

Conversion Time: Configurable: 10, 16.7, 20, or 100 ms

Noise Rejection: Selectable: 50Hz, 60Hz, 400Hz, or 10Hz

Cold Junction Compensation: Internal sensor or external compensation module (6ES7431-7KF00-6AA0)

Diagnostics: Wire break, over/under range, limit alarms, hardware interrupts

Power from Backplane: 5V DC, max 1200 mA

Module Power Loss: Typically 4.6 W

Max Cable Length: 200 m (shielded)

Isolation Test Voltage: 1500 V DC

Dimensions (W x H x D): 25 mm x 290 mm x 210 mm

Weight: Approximately 650 g

Installation & Configuration Guide

Install this module into your S7-400 rack. For thermocouples, use the correct compensating cable and enable internal or external cold junction compensation in the configuration. For high-speed applications, set the integration time to 2.5ms. For high-noise environments, use the 100ms setting for best 50/60Hz noise rejection.

Package Contents & Warranty

What's Included: One new Siemens 6ES7431-7KF00-0AB0 analog input module.

Our Guarantee: This product is backed by a full 12-month warranty.

Fast Worldwide Delivery

We ship quickly and reliably using FedEx, UPS, and DHL.

Frequently Asked Questions (FAQ)

What makes this module better for temperature measurement?

It has built-in linearization curves for ten thermocouple types, eliminating the need for complex scaling in your PLC program and providing more accurate temperature readings directly.

Can I mix different sensor types on one module?

Yes. Each of the 8 channels can be independently configured for a different input type (e.g., Channel 1 for Type K thermocouple, Channel 2 for 4-20mA).

What is "cold junction compensation" and do I need it?

Yes, it's essential for thermocouples. Thermocouples measure the temperature difference between the tip and the connection point (cold junction). The module's internal sensor measures this connection point temperature to calculate the absolute temperature at the tip.

How fast can it scan all 8 channels?

The total cycle time depends on the conversion time setting. At the fastest 10ms per channel setting, it can read all 8 channels in approximately 80ms, plus a small overhead.

What diagnostic alarms does it provide?

It can generate alarms for sensor wire break, measured value exceeding the configured input range, and if a signal goes above or below a programmable high/low limit you set.

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