Siemens 6ES7431-7QH00-0AB0 SM 431 Analog Input Module – AI 16 × 16 Bit
16-Channel Analog Input
16-Bit Resolution
6ES7431-7QH00-0AB0 pdf
Place of Origin:
Germany
Brand Name:
Siemens
16-Channel Analog Input
,16-Bit Resolution
,6ES7431-7QH00-0AB0 pdf
6ES7431-7QH00-0AB0
Analog input module for S7-400 automation systems, with configurable measurement methods and diagnostic functions.
Technical Specifications
Model-specific Siemens reference data| Manufacturer | Siemens |
| Product family | SIMATIC S7-400 |
| Module designation | SM 431 analog input module |
| Module type | AI 16 × 16 Bit |
| Article number | 6ES7431-7QH00-0AB0 |
| Measurement principle | Integrating |
| Total analog inputs | 16 |
| Voltage / current / thermocouple | 16 inputs |
| Resistance / RTD measurement | 8 inputs |
| Resolution | 16 bit |
| Measurement methods | Voltage, current, resistance, resistance thermometer and thermocouple |
| Voltage ranges | ±25 mV, ±50 mV, ±80 mV, ±250 mV, ±500 mV |
| Additional voltage ranges | ±1 V, ±2.5 V, ±5 V, 1–5 V, ±10 V |
| Voltage input resistance | 1 MΩ |
| Current ranges | ±5 mA, ±10 mA, ±20 mA, 0–20 mA, 4–20 mA |
| Current input resistance | 50 Ω |
| 2-wire current transmitter burden | Maximum 750 Ω |
| Current transmitter connection | 2-wire and 4-wire transducers |
| Maximum voltage input limit | 18 V continuous; 75 V for 1 ms, duty ratio 1:20 |
| Maximum current input limit | 40 mA |
| Resistance ranges | 0–48 Ω, 0–150 Ω, 0–300 Ω, 0–600 Ω, 0–6000 Ω |
| Usable upper value in 6000 Ω range | 5000 Ω |
| Resistance sensor wiring | 2-wire, 3-wire and 4-wire |
| RTD wiring | 3-wire and 4-wire |
| Supported resistance thermometers | Pt100, Pt200, Pt500, Pt1000, Ni100 and Ni1000 |
| Thermocouple types | B, E, J, K, L, N, R, S, T and U |
| RTD / TC input resistance | 1 MΩ |
| Resistance measurement current | Typical 1.67 mA |
| Temperature compensation | Parameterizable |
| External compensation | Pt100 or compensation socket |
| Dynamic reference temperature | Supported |
| Characteristic linearization | Parameterizable for supported thermocouple and RTD types |
| Integration time | Parameterizable |
| Basic conversion time | 6 / 20.1 / 23.5 ms |
| Integration time settings | 2.5 / 16.7 / 20 ms |
| Additional wire-break monitoring time | 4.3 ms |
| Additional resistance measurement time | 12 / 40.2 / 47 ms |
| Interference frequency suppression | 400 / 60 / 50 Hz |
| Measured-value smoothing | Parameterizable, 4 stages |
| Linearity error | ±0.01% of input range |
| Temperature error | ±0.004% of input range per K |
| Repeat accuracy at 25°C | ±0.1% of input range |
| Voltage operational error limit | Typically ±0.3%; range-dependent values apply |
| Current operational error limit | ±0.3% of input range |
| RTD operational error limit | ±0.4% of input range |
| Thermocouple operational error | Depends on thermocouple type |
| Crosstalk between inputs | Greater than 70 dB |
| Shielded cable length | Maximum 200 m; 50 m for thermocouples and ranges ≤80 mV |
Thermocouple Operational Error Values
| Type B | ±11.5 K |
| Type R | ±7.3 K |
| Type S | ±8.3 K |
| Type T | ±1.7 K |
| Type E | ±3.2 K |
| Type J | ±4.3 K |
| Type K | ±6.2 K |
| Type U | ±2.8 K |
| Type L | ±4.2 K |
| Type N | ±4.4 K |
05 / Power Supply & Electrical Isolation
| Load voltage L+ | 24 V DC; required for supplying 2-wire transmitters |
| Current from L+ | Maximum 400 mA with 16 connected, fully controlled 2-wire transmitters |
| Current from 5 V backplane bus | Maximum 700 mA |
| Transmitter supply output | Short-circuit proof |
| Transmitter supply current | Maximum 50 mA |
| Typical power loss | 4.5 W |
| Analog section / CPU | Potential separation |
| Channel-to-channel isolation | No |
| Isolation from backplane bus | Yes |
| Isolation from load voltage L+ | Yes |
| Specified potential difference | 60 V DC / 30 V AC, according to the module data |
06 / Diagnostics, Interrupts & Mechanical Data
| Configurable diagnostics | Yes |
| Diagnostic information | Readable |
| Diagnostic interrupt | Parameterizable |
| Limit value alarm | Parameterizable |
| Hardware interrupt | Parameterizable |
| Diagnostic functions | Wire break, reference-channel error, underflow and overflow |
| Short-circuit to M diagnostics | Configurable for 2-wire current transducer measurement |
| Internal fault indicator | Red INTF LED |
| External fault indicator | Red EXTF LED |
| Substitute values | Not connectable |
| Width × height × depth | 25 × 290 × 210 mm |
| Approximate weight | 500 g |
Reference: Siemens S7-400 Automation System Module Data, section 5.23, article number 6ES7431-7QH00-0AB0.
Configuration & Installation Notes
Hardware selection · STEP 7 setup · commissioningMeasuring-Range Module & STEP 7 Setup
The operating mode is selected through the measuring-range modules on the SM 431 and the measurement-type parameters in STEP 7. Each measuring-range module serves a pair of channels; the physical selector position and software configuration must therefore be planned together.
- Set the measuring-range modules to the required signal type and range.
- Configure the corresponding measurement method for each channel in STEP 7.
- Check the paired-channel restrictions for 0/1, 2/3, 4/5, 6/7, 8/9, 10/11, 12/13 and 14/15.
- For unused channels, set the measuring method to Deactivated; the measuring-range module should be set to position A.
Wiring & Commissioning Checks
- Confirm the selected 2-wire or 4-wire current transmitter connection.
- For 2-wire current transmitters, provide 24 V DC at the L+ and M front-connector terminals.
- Verify the RTD type, thermocouple type and reference-junction arrangement.
- Observe the cable-length limit for the selected measuring method.
Application & Failure Scenarios
Process measurement · control feedback · maintenanceProcess Signal Acquisition
In SIMATIC S7-400 installations, this module receives analog process signals from field instrumentation. Its measurement capabilities are relevant to systems that monitor process variables through voltage and current transmitters, resistance sensors, resistance thermometers and thermocouples. These inputs can form part of machine feedback, temperature supervision and process monitoring functions.
Typical Maintenance Triggers
Supply & Warranty
Order handling & after-sales coordinationGlobal Industrial Sourcing
Part identification · international supply · order coordination
Supporting Maintenance and Procurement Worldwide
AMIKON works with industrial maintenance and procurement teams to source automation and control-system components. From part-number identification to order communication and shipment coordination, our focus is on practical support for industrial supply requirements.
Talk to Our Sales Team
Contact Miya Zheng for product and order enquiries.
Frequently Asked Questions
6ES7431-7QH00-0AB01. Which sensor types can this SM 431 module measure?
The documented sensor types include voltage and current signals, resistance sensors, Pt100/Pt200/Pt500/Pt1000 and Ni100/Ni1000 resistance thermometers, and thermocouple types B, E, J, K, L, N, R, S, T and U.
2. Does the module support 4–20 mA transmitters?
Yes. The documented current ranges include 4–20 mA. Both 2-wire and 4-wire current transducers are supported; 2-wire transmitters require a 24 V DC supply at the L+ and M front-connector terminals.
3. How are the input channels configured?
The measuring-range modules on the hardware and the measuring-type parameters in STEP 7 determine the measurement setup. Adjacent channels have specified pairing restrictions, so the hardware positions and software parameters must be checked together.
4. What diagnostic functions are available?
The module supports configurable diagnostics, diagnostic interrupts, limit alarms and hardware interrupts. It also provides INTF and EXTF fault LEDs, and configurable checks including wire break, reference-channel error, underflow and overflow.
Related Models
Additional sourcing references
video
video
video
Send your inquiry directly to us
