6ES7431-7KF00-0AB0 Siemens S7-400 - Analog Input Module

6ES7431-7KF00-0AB0 — Siemens SIMATIC S7-400 Analog Input Module SM 431

Key Technical Specifications

• Brand: Siemens — a trusted name in industrial automation.
• Model: 6ES7431-7KF00-0AB0 — part of the SIMATIC S7-400 family.
• Category: Analog input module SM 431, isolated, 8 AI channels.
• Resolution: 16-bit with overrange, including sign bit.
• Conversion time: 20 ms per channel for precise measurement.
• Input current: Max. 1200 mA from backplane bus at 5 V DC.
• Power loss: Typically 4.6 W during normal operation.
• Isolation: Tested with 1500 V DC for safe industrial use.

Voltage and Current Input Ranges

• Voltage ranges: ±20 mV, ±50 mV, ±80 mV, ±100 mV, ±250 mV, ±500 mV.
• Additional voltage ranges: ±1 V, ±2.5 V, ±5 V, ±10 V, and 1–5 V.
• Input resistance: Over 2000 ohms for 1–5 V range; 50 ohms for 4–20 mA.
• Current ranges: 0–20 mA, ±3.2 mA, ±5 mA, ±10 mA, ±20 mA, and 4–20 mA.
• Permissible input voltage: Max. 35 V continuous; 75 V for up to 1 s.
• Permissible input current: Max. 32 mA for current inputs.

Thermocouple Support and Temperature Compensation

• Thermocouple types: B, E, J, K, L, N, R, S, T, and U.
• Input resistance: Over 2000 ohms for Type B and Type N thermocouples.
• Internal compensation: Yes — built-in cold junction compensation.
• External compensation: Yes — with compensation socket 6ES7431-7KF00-6AA0.
• Dynamic reference temperature: Yes — supports changing reference values.
• Linearization: Parameterizable for all supported thermocouple types.

Accuracy, Diagnostics, and Alarms

• Operational error: ±0.3 % for voltage; ±0.5 % for current over full temperature range.
• Basic error at 25 °C: ±0.1 % for voltage; ±0.17 % for current.
• Diagnostics function: Yes — fully parameterizable for system monitoring.
• Diagnostic alarm: Yes — triggers when faults occur.
• Limit value alarm: Yes — alerts when signals exceed set thresholds.
• Hardware interrupt: Yes — parameterizable for fast event response.
• Interference suppression: Selectable for 400 Hz, 60 Hz, 50 Hz, or 10 Hz.

Isolation, Installation, and Physical Data

• Channel isolation: Yes — each channel is isolated from the others.
• Backplane isolation: Yes — channels are isolated from the backplane bus.
• Shielded cable length: Max. 200 m for reliable signal transmission.
• Dimensions: 25 mm wide, 290 mm high, and 210 mm deep.
• Weight: Approximately 650 g — easy to handle during installation.
• Integration time: Parameterizable with 2.5 ms, 16.7 ms, 20 ms, or 100 ms options.
• Basic conversion time: 10 ms, 16.7 ms, 20 ms, or 100 ms per channel.

Installation Guide

• Mount the module in a Siemens S7-400 rack with proper backplane connection.
• Use shielded twisted-pair cables for all analog signal connections.
• Connect thermocouple compensation socket 6ES7431-7KF00-6AA0 for external cold junction.
• Keep cable length under 200 m to maintain measurement accuracy.
• Configure input ranges, diagnostics, and alarms in STEP 7 software.
• Verify wiring polarity before power-up to protect the module.
• Allow warm-up to 25 °C for best accuracy and lowest error.
• Do not exceed 35 V continuous input voltage to avoid damage.

Package Contents

• 1 × Siemens 6ES7431-7KF00-0AB0 analog input module SM 431.
• 1 × Quick reference guide for wiring and configuration.
• 1 × Protective shipping carton with anti-static foam.

Shipping and Support

• We ship via FedEx, UPS, and DHL — select your courier at checkout.
• Our stock is ready for immediate dispatch within 5 days after payment.
• We accept returns within 30 days for unused items in original packaging.
• Contact us for bulk orders or technical questions about this Siemens module.

FAQ

• Q: What is the resolution of the 6ES7431-7KF00-0AB0?
  A: It provides 16-bit resolution with overrange, including the sign bit.
• Q: Which thermocouple types does this module support?
  A: It supports Type B, E, J, K, L, N, R, S, T, and U thermocouples.
• Q: Does this module have channel isolation?
  A: Yes, each channel is isolated from the others and from the backplane bus.
• Q: What is the conversion time for this module?
  A: The basic conversion time is 20 ms per channel, with parameterizable options.
• Q: Can I use this module for resistance measurement?
  A: No, it does not support resistance or resistance thermometer measurement.
• Q: What is the maximum shielded cable length?
  A: You can use shielded cables up to 200 meters long without signal degradation.
• Q: Does this module support external cold junction compensation?
  A: Yes, it works with compensation socket 6ES7431-7KF00-6AA0 for external compensation.
• Q: What is the power loss of this module?
  A: The typical power loss is 4.6 W during normal operation.
• Q: What diagnostics functions does this module offer?
  A: It provides parameterizable diagnostics, diagnostic alarms, limit value alarms, and hardware interrupts.
• Q: How do I suppress interference at 50 Hz or 60 Hz?
  A: You can parameterize the interference suppression frequency in STEP 7 software.

Contact Information

• Inquiries: sales@nex-auto.com
• Phone/WhatsApp: +86 153 9242 9628
• Partner: NexAuto Technology Limited