Process Automation & Precision Measurement Solution — Siemens 6ES7431-1KF00-0AB0 | SIMATIC S7-400 SM 431
The Siemens 6ES7431-1KF00-0AB0 is a high-precision analog input module from the SIMATIC S7-400 series, designed for demanding industrial process control environments where accurate, isolated multi-channel signal acquisition is critical. With 8 fully isolated analog input channels and 13-bit resolution, this SM 431 module is the go-to choice for engineers specifying reliable measurement in heavy industry, chemical processing, and power generation.
Where This Product Is Used
The 6ES7431-1KF00-0AB0 is deployed across a wide range of industrial applications where multi-channel analog signal acquisition must be both precise and electrically isolated:
- Chemical & Petrochemical Plants — Continuous monitoring of temperature, pressure, and flow via 4–20 mA transmitters; isolated channels prevent ground loops in hazardous environments.
- Power Generation & Utilities — Turbine control, generator excitation monitoring, and grid-tie measurement systems requiring high-resolution voltage/current inputs.
- Water & Wastewater Treatment — pH, dissolved oxygen, and flow measurement integrated into S7-400-based SCADA systems.
- Steel & Metals Manufacturing — Furnace temperature profiling, rolling mill tension control, and continuous casting process monitoring.
- Oil & Gas Upstream/Midstream — Pipeline pressure monitoring, separator level control, and compressor station automation.
- Pharmaceutical Manufacturing — GMP-compliant process variable acquisition for batch reactors and clean-room HVAC systems.
- Building Automation (Large Facilities) — Central BMS integration for chiller plants, district cooling, and energy metering.
Technical Specifications
| Parameter | Value |
|---|---|
| Order Number | 6ES7431-1KF00-0AB0 |
| Series | SIMATIC S7-400 SM 431 |
| Analog Input Channels | 8 (fully isolated) |
| Resolution | 13 bit |
| Input Types | Voltage (U), Current (I), Resistance / RTD |
| Isolation | Channel-to-channel and channel-to-backplane isolated |
| Voltage Input Range | ±10 V, ±5 V, ±2.5 V, 1–5 V |
| Current Input Range | ±20 mA, 4–20 mA, 0–20 mA |
| Resistance Input | 0–600 Ω, 0–6000 Ω |
| Conversion Time (per channel) | ~1 ms (integration time dependent) |
| Supply Voltage | DC 24 V (via S7-400 backplane) |
| Backplane Bus | S7-400 P-bus / K-bus |
| Dimensions (W × H × D) | 25 mm × 290 mm × 210 mm |
| Weight | 759 g |
| Operating Temperature | 0 °C to +60 °C |
| Storage Temperature | −40 °C to +70 °C |
| Protection Class | IP 20 |
| Certifications | CE, UL, cULus, ATEX (zone 2 with appropriate housing) |
Why Engineers Specify This Model
- Full Channel Isolation — Each of the 8 channels is individually isolated, eliminating ground loops and protecting the CPU from field-side faults — essential in multi-transmitter installations.
- Flexible Input Types in One Module — Supports voltage, current, and resistance inputs simultaneously across channels, reducing the number of module types needed in a panel.
- 13-Bit Resolution — Provides 8,192 discrete steps across the measurement range, delivering the accuracy required for PID control loops and regulatory compliance.
- S7-400 Platform Reliability — Designed for the S7-400’s high-availability architecture; supports hot-swap in redundant CPU configurations.
- Proven Long-Term Availability — A mature, widely deployed module with extensive installed base, ensuring spare parts availability and engineering familiarity.
- Seamless TIA Portal / STEP 7 Integration — Fully parameterizable via HW Config in STEP 7 Classic and TIA Portal V15+, with no additional licensing required.
Complete System Bill of Materials
A typical S7-400 analog acquisition rack using the 6ES7431-1KF00-0AB0 includes:
- CPU — e.g., 6ES7414-2XK05-0AB0 (CPU 414-2) or 6ES7416-3XR05-0AB0 (CPU 416-3)
- Power Supply — 6ES7407-0KA02-0AA0 (PS 407, 10 A) or 6ES7407-0RA02-0AA0 (PS 407, 20 A redundant)
- Rack — 6ES7400-1JA01-0AA0 (UR2, 9-slot) or 6ES7400-2JA00-0AA0 (UR2-H, 18-slot)
- This Module — 6ES7431-1KF00-0AB0 (SM 431, 8 AI isolated)
- Front Connector — 6ES7492-1AL00-0AA0 (40-pin screw terminal front connector)
- Digital Output Module (if needed) — 6ES7422-1BL00-0AA0 (SM 422, 32 DO)
- Communications Processor (optional) — 6GK7443-1EX30-0XE0 (CP 443-1, Ethernet)
- Programming Cable / Interface — 6ES7972-0CB20-0XA0 (PC Adapter USB)
Compliance & Industry Standards
- CE Marking — Compliant with EU Low Voltage Directive and EMC Directive
- UL / cULus Listed — Recognized for use in North American industrial installations
- IEC 61131-2 — Programmable controller hardware standard compliance
- ATEX / IECEx Zone 2 — Suitable for use in Zone 2 explosive atmospheres when installed in certified enclosures
- RoHS Compliant — Restriction of Hazardous Substances directive
- ISO 9001 — Manufactured under Siemens’ certified quality management system
Quality Assurance & Sourcing
- ✅ Genuine Siemens hardware — sourced from authorized distribution channels and verified OEM supply chains
- ✅ Pre-shipment inspection — each unit undergoes visual inspection, label verification, and functional continuity checks
- ✅ Traceability — batch records and supplier documentation available on request
- ✅ Packaging integrity — shipped in original or equivalent ESD-safe packaging with desiccant
- ✅ Warranty — 12-month warranty against manufacturing defects; DOA replacement within 7 days
How to Source This Part
- Confirm your S7-400 rack slot availability — verify available slots and backplane bus type (UR1/UR2/UR2-H).
- Check front connector stock — the 6ES7492-1AL00-0AA0 40-pin connector is required and sold separately.
- Contact Konmask — email support@konmask.com or call +0086 19859288691 with your required quantity and delivery timeline.
- Request a quotation — we provide formal quotations with lead time, unit price, and shipping options (DHL / FedEx / sea freight).
- Place order & receive documentation — purchase order confirmation, packing list, and commercial invoice provided for customs clearance.
Application-Specific FAQ
Q: Can I mix voltage and current inputs on the same 6ES7431-1KF00-0AB0 module?
A: Yes. Each channel is independently parameterized in HW Config / TIA Portal, allowing different input types (U, I, resistance) to be assigned per channel on the same module.
Q: Is this module compatible with S7-400H (high-availability) systems?
A: Yes. The SM 431 can be used in S7-400H redundant configurations. Ensure the rack and CPU firmware support the module revision installed.
Q: What is the difference between 6ES7431-1KF00-0AB0 and 6ES7431-1KF10-0AB0?
A: The -1KF10 is a later hardware revision with minor improvements to EMC performance and diagnostic capabilities. Both are functionally equivalent for most applications and use the same front connector and parameterization.
Q: Does this module support HART communication?
A: No. The SM 431 does not support HART pass-through. For HART-enabled analog input, consider the 6ES7331-7TF01-0AB0 (S7-300) or dedicated HART multiplexers.
Q: What front connector is required?
A: The 6ES7492-1AL00-0AA0 (40-pin screw terminal) is the standard front connector for this module. It is not included and must be ordered separately.
Q: Can Konmask provide a test report or inspection certificate?
A: Yes. Inspection reports and supplier traceability documents are available upon request for orders of 2+ units. Contact us before placing your order.
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