Product Description
Key Features
- SIMATIC S7-400 analog input: SM 431 module with 8 isolated analog inputs and 14-bit resolution.
- Voltage, current, and resistance inputs: Supports voltage and current measurement, plus resistance measurement on 4 inputs.
- Input ranges: Rated ranges include 1 V to 5 V, -1 V to +1 V, -10 V to +10 V, -20 mA to +20 mA, 4 mA to 20 mA, and 0 to 600 ohms.
- 24 V supply for 2-wire transmitters: Load voltage L+ rated value is 24 V DC and is only required for supplying 2-wire transmitters.
- Product lifecycle: Product lifecycle: Announcement of product phase-out.
Technical Summary
| Product identity | SIMATIC S7-400, analog input SM 431, isolated 8 AI, resolution 14 bit, U/IResistor 8 AI, cycle time 0.416 ms |
|---|---|
| Analog inputs | 8 |
| Measurement types | Voltage, current, and resistance |
| Input ranges | 1 V to 5 V; -1 V to +1 V; -10 V to +10 V; -20 mA to +20 mA; 4 mA to 20 mA; 0 to 600 ohms |
| Load voltage L+ | 24 V DC; only required for supplying 2-wire transmitters |
| Resolution with overrange | 14 bit; 14 / 14 / 14 |
| Basic execution time | 0.42 ms with all channels released |
| Signal encoder connections | Voltage; 2-wire and 4-wire current; 2-wire, 3-wire, and 4-wire resistance |
| Product lifecycle | Announcement of product phase-out |
Frequently Asked Questions
What order number should be confirmed for this SM 431 module?
Confirm the complete order number 6ES7431-1KF20-0AB0 on the installed part or nameplate.
Which signals can the module measure?
It supports voltage, current, and resistance measurement. Thermocouple and resistance thermometer input ranges are not supported.
What supply is required for 2-wire transmitters?
Load voltage L+ is 24 V DC and is only required for supplying 2-wire transmitters.
What input ranges are available?
Available ranges include 1 V to 5 V, -1 V to +1 V, -10 V to +10 V, -20 mA to +20 mA, 4 mA to 20 mA, and 0 to 600 ohms.
