Product Introduction: AI 8xU/I HF Analog Input Module
The 6ES7531-7NF00-0AB0 belongs to the SIMATIC S7-1500 series. This high-performance analog input module offers 8 channels for voltage or current measurement. It achieves up to 24-bit resolution with 0.1% accuracy. The module supports scalable measured values and measuring range adjustment. You can calibrate it during RUN without stopping the process. It includes diagnostics, hardware interrupts, and common mode voltage up to 60 V DC / 30 V AC. Delivery includes infeed element, shield bracket, and shield terminal. Order the front connector separately (screw or push-in).
Technical Specifications
| Brand | Siemens |
| Model | 6ES7531-7NF00-0AB0 |
| Series | SIMATIC S7-1500 |
| Module Type | Analog Input Module AI 8xU/I HF |
| Resolution | Up to 24 bit (REAL) / 16 bit (INT) |
| Accuracy | 0.1% (overall temperature range) |
| Input Ranges (Voltage) | ±10V, ±5V, ±2.5V, 1..5V |
| Input Ranges (Current) | 0..20mA, ±20mA, 4..20mA |
| Destruction Limit (Voltage) | 28.8 V max |
| Destruction Limit (Current) | 40 mA max |
| Input Resistance (Voltage) | 100 kΩ |
| Input Resistance (Current) | 25 Ω + PTC (~42 Ω) |
| Integration Time | Fast: 2.5 / 16.67 / 20 / 100 ms Standard: 7.5 / 50 / 60 / 300 ms |
| Conversion Time | Fast: 4 / 18 / 22 / 102 ms Standard: 9 / 52 / 62 / 302 ms |
| Interference Suppression | 400 / 60 / 50 / 10 Hz |
| Crosstalk Attenuation | max. -80 dB |
| Common Mode Voltage | 60 V DC / 30 V AC |
| CMRR | min. 80 dB |
| Linearity Error | ±0.02 % |
| Temperature Error | ±0.005 %/K |
| Repeat Accuracy (25°C) | ±0.02 % |
| Operating Temperature (Horizontal) | -30°C .. 60°C |
| Operating Temperature (Vertical) | -30°C .. 40°C |
| Shielded Cable Length | max. 800 m |
| Diagnostics | Supply voltage, wire-break (1..5V / 4..20mA), overflow/underflow |
| Alarms | Diagnostic, limit value (2 upper / 2 lower) |
| LED Indicators | RUN, ERROR, PWR, channel status, diagnostics |
| Channel Isolation | Galvanically isolated (groups of 1) |
| Rated Supply Voltage | 24 V DC (19.2 .. 28.8 V) |
| Current Consumption | max. 50 mA |
| Power Loss | typ. 1.9 W |
| Dimensions (WxHxD) | 35 x 147 x 129 mm |
| Weight | approx. 280 g |
Installation & Commissioning
Mount the module horizontally (0..60°C) or vertically (0..40°C). Use shielded cables up to 800 m. The front connector (screw or push-in) is ordered separately. The module supports reparameterization in RUN and calibration during operation. Diagnostics LEDs simplify troubleshooting.
Compatibility & Engineering
Configure with STEP 7 TIA Portal V14 or STEP 7 V5.5 SP3. PROFIBUS GSD V1.0 / V5.1, PROFINET GSD V2.3. Supports I&M data (I&M0 to I&M3), prioritized startup, and MSI. No oversampling or isochronous mode.
Diagnostic Capabilities
- Supply voltage monitoring
- Wire-break detection (1..5V / 4..20mA)
- Overflow / underflow alarm
- Hardware interrupts
- LEDs: RUN (green), ERROR (red), PWR (green), channel status (green), channel diagnostics (red), module diagnostics (red)
Typical Applications
Industrial automation, process control, factory automation, PLC systems requiring high-precision analog input. Suitable for voltage and current transducers, 2-wire or 4-wire transmitters.
Frequently Asked Questions (FAQ)
Q: What is the resolution?
A: Up to 24-bit in REAL format, 16-bit in INTEGER format.
Q: Does it support thermocouples or RTDs?
A: No, this module is for voltage/current only.
Q: Can I calibrate in RUN?
A: Yes, calibration is possible during operation.
Q: What is the common mode voltage?
A: 60 V DC / 30 V AC.
Why Buy From Oiltech Controls?
-
- Over 15 years of experience in industrial automation spares
- Global shipping support – FedEx, UPS, DHL
- Tested industrial surplus and refurbished options
- 12-month warranty on all products
- Technical verification before shipment
- Expert support for obsolete control systems
Contact Information: For inquiries, email info@oiltechcontrols.com or call +86 158 8020 0923 (WhatsApp).
Packaging List: Module, infeed element, shield bracket, shield terminal. Front connector not included.
Shipping: We ship via FedEx, UPS, or DHL. Expedited options available.
Certifications: CE, UL (basic insulation 120 V AC), tested for 2000 V DC isolation.
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Original Source: https://www.oiltechcontrols.com/
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