Product Brief – 6ES7431-7KF00-0AB0
6ES7431-7KF00-0AB0 is an analog input module for SIMATIC S7-400 systems. It provides 8 individually isolated channels for voltage, current, and thermocouple signals. The 16‑bit resolution and 20 ms conversion time support precise measurements. Use it for demanding process automation tasks.
Technical Profile
- Brand: Siemens
- Model: 6ES7431-7KF00-0AB0
- Series: SIMATIC S7-400
- Module Type: SM 431 – 8 AI, isolated
- Channels: 8 (voltage / current / thermocouple)
- Resolution: 16 bit with overrange
- Conversion time: 10 / 16.7 / 20 / 100 ms (selectable)
- Power loss: typ. 4.6 W
- Backplane current: max. 1200 mA (5 V DC)
Input Ranges & Accuracy
- Voltage: ±20 mV to ±10 V, 1 V to 5 V – error ≤ ±0.1 % (25 °C)
- Current: 0/4..20 mA, ±3.2 mA to ±20 mA – error ≤ ±0.17 %
- Thermocouple: Types B, E, J, K, L, N, R, S, T, U – linearization supported
- Destruction limits: 35 V (voltage) / 32 mA (current)
- Input resistance: > 2 kΩ (voltage/TC) / 50 Ω (4..20 mA)
- Temperature compensation: internal, external, or dynamic reference
Diagnostics & Alarms
- Parameterizable diagnostic alarm and hardware interrupt
- Limit value alarm for process monitoring
- Readable diagnostic information via STEP 7
- Channel status and error LEDs
Isolation & Environment
- Galvanic isolation between channels and backplane bus
- Test voltage: 1500 V DC
- Shielded cable length: max. 200 m
- Dimensions (WxHxD): 25 x 290 x 210 mm, weight ~650 g
Compatibility & Integration
- Works with SIMATIC S7-400 CPUs (e.g., 416, 417, 414)
- Engineering via STEP 7 V5.x or TIA Portal (via GSD)
- Supports 4‑wire transducers for current measurement
- Resistance measurement with 4‑wire connection
- Not suitable for resistance thermometers (RTD)
Oiltech Controls’s Insight
- This module excels in multi‑signal environments – one unit handles voltage, current, and TC.
- Choose the 16.7 ms integration time for 60 Hz noise rejection in North American plants.
- For high‑accuracy voltage readings, use shielded cables and external cold‑junction compensation.
- The 20 ms conversion time is a good balance between speed and noise suppression.
Typical Applications & Suitable Equipment
- Process monitoring in chemical and power plants
- Temperature measurement with thermocouples (types K, J, T)
- Analog signal acquisition from transmitters (4‑20 mA)
- Works with S7‑400 racks: UR1, UR2, CR2, and ER series
- Compatible with ET 200M remote I/O stations (via IM 153)
Professional FAQ – 5 Expert Questions
- Q: Which integration time fits my application?
Use 16.7 ms for 60 Hz, 20 ms for 50 Hz, or 100 ms for high noise. Shorter times (2.5 ms) reduce accuracy. - Q: Can I mix TC and current on one module?
Yes – each channel is independently configurable for voltage, current, or thermocouple. - Q: How to compensate cold junction?
Use internal compensation, external socket (6ES7431‑7KF00‑6AA0), or dynamic reference. Internal is easiest. - Q: What accuracy can I expect in a hot cabinet?
The operational error limit over full temperature is ±0.3 % (voltage) and ±0.5 % (current) – plan for derating. - Q: Is this module suitable for hazardous areas?
No – it lacks intrinsic safety certification. Use Ex‑rated isolators if needed.
Why Buy From Oiltech Controls?
- Decades of expertise in industrial automation spares
- Reliable worldwide shipping via FedEx, UPS, or DHL
- Thoroughly tested surplus and refurbished options
- 12‑month warranty with technical support
- Pre‑shipment verification ensures function
- Support for legacy and obsolete systems
Contact: info@oiltechcontrols.com | +86 158 8020 0923 (WhatsApp)
Shipping: Orders ship within 24‑28 hours. Tracking via FedEx, UPS, or DHL.
Warranty: 12 months from delivery against defects.
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