Siemens 6ES7431-1KF10-0AB0 Analog Input Module – 8 AI for S7-400

Siemens 6ES7431-1KF10-0AB0 – 8-Channel Analog Input Module

6ES7431-1KF10-0AB0 is an isolated analog input module for SIMATIC S7-400. It provides 8 AI with 14-bit resolution. It supports voltage, current, resistor, thermocouple, and Pt100. This module fits demanding industrial automation tasks.

Technical Overview – 6ES7431-1KF10-0AB0

• Supply voltage: 24 V DC (for 2-wire transmitters), reverse polarity protected.
• Current draw: max. 200 mA from L+ (8 transmitters), 600 mA from backplane bus (5 V DC).
• Power loss: typ. 3.5 W.
• Destruction limits: 18 V continuous (voltage), 75 V for 1 ms; 40 mA permanent (current).
• Constant measurement current: typ. 1.67 mA for resistance transmitters.

Input Ranges & Resolution

• Voltage ranges: ±80 mV, ±250 mV, ±500 mV, ±1 V, ±2.5 V, ±5 V, ±10 V, 1~5 V – input resistance 1 MΩ.
• Current ranges: 0~20 mA, 4~20 mA – input resistance 50 Ω.
• Thermocouple types: B, E, J, K, L, N, R, S, T, U – input resistance 1 MΩ.
• RTD types: Pt100, Pt200, Pt500, Pt1000, Pt10000, Ni100, Ni1000 – 1 MΩ input.
• Resistance ranges: 0~48 Ω, 0~150 Ω, 0~300 Ω, 0~600 Ω, 0~6000 Ω (usable up to 5000 Ω).
• Resolution: 14-bit (with filtering: 16-bit).
• Integration time: 16.7 / 20 ms (50/60 Hz suppression).
• Basic conversion time: 20.1 / 23.5 ms per channel.
• Module execution time (all channels): 161 / 188 ms.

Accuracy & Temperature Error

• Temperature error: ±0.004 %/K.
• Operational error (full temp range): Voltage ±0.38 %; Current ±0.35 %; Resistance ±0.5 %; RTD ±0.5 %.
• Basic error (25 °C): Voltage ±0.15 % (except ±80 mV: ±0.17 %); Current ±0.15 %; Resistance ±0.15 % (4-wire) / ±0.3 % (3-wire).
• Thermocouple basic error: Type B ±8.2 K, R ±5.2 K, S ±5.9 K, T ±1.2 K, E ±1.8 K, J ±2.3 K, K ±3.4 K, U ±1.8 K, L ±2.3 K, N ±2.9 K.

Installation & Commissioning

• Mount in S7-400 rack – width 25 mm, height 290 mm, depth 210 mm.
• Connect shielded cables – max. 200 m (50 m for TC or ranges ≤ ±80 mV).
• Use 2-, 3-, or 4-wire connections for resistance/RTD.
• External temperature compensation via Pt100 or compensation socket.
• Parameterize integration time and linearization via STEP 7.

Compatibility & Certification

• Designed for SIMATIC S7-400 series (e.g., 412, 414, 416, 417 CPUs).
• Isolation: 2120 V DC between bus and analog section; 500 V DC between analog and ground.
• No built-in diagnostics – but external monitoring possible.
• CE, UL, and RoHS compliant.

Package Contents

• 1 x 6ES7431-1KF10-0AB0 module
• 1 x front connector (screw-type)
• 1 x labeling strip
• Warranty card (12 months)

Oiltech Controls’s Insight – Why This Module?

• High-density 8-channel design saves rack space.
• Wide input flexibility – voltage, current, TC, RTD, resistance.
• 16-bit resolution with filtering for noisy environments.
• Excellent for retrofitting legacy S7-400 systems.
• Reliable for power generation, chemical, and metal processing.

Suitable Equipment & Applications

• PLCs: SIMATIC S7-400 (all CPU versions).
• Typical use: Temperature monitoring (TC/RTD), pressure/flow (4~20 mA), voltage signals from sensors.
• Industries: Power plants, automotive test benches, aerospace ground support, heavy machinery.

5 Professional FAQ – 6ES7431-1KF10-0AB0

• Q1: Can I mix thermocouple and 4~20 mA inputs on the same module?
  Yes – each channel is independently configurable. You can assign different input types per channel via STEP 7.
• Q2: What is the maximum cable length for thermocouple signals?
  Keep shielded TC cables ≤ 50 m for ranges ≤ ±80 mV. For other ranges, max. 200 m.
• Q3: Does this module support HART communication?
  No – it is a standard analog input. HART requires a dedicated multiplexer or HART-enabled module.
• Q4: How do I compensate for cold junction temperature?
  Use external Pt100 or compensation socket. Internal compensation is not available.
• Q5: Is the module suitable for high-vibration environments?
  Yes – S7-400 design is rugged. Ensure proper rack mounting and use shielded cables.

Why Buy From Oiltech Controls?

• 15+ years in industrial automation spare parts – deep technical knowledge.
• Global shipment with FedEx, UPS, or DHL – 24~28 hours dispatch.
• Tested surplus and refurbished options – each unit verified.
• 12-month warranty – full coverage for peace of mind.
• Technical verification before shipment – we test every parameter.
• Expert support for obsolete control systems – we know S7-400 inside out.

Contact: info@oiltechcontrols.com | +86 158 8020 0923 (WhatsApp)

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