Product Overview
Technical Summary
| Parameter | Value |
|---|---|
| Analog input channels | 8 |
| Measurement types | Voltage, current and resistance |
| Resolution with overrange | 14 bit including sign |
| Voltage input ranges | 1 V to 5 V; -1 V to +1 V; -10 V to +10 V |
| Current input ranges | -20 mA to +20 mA; 4 mA to 20 mA |
| Resistance input range | 0 to 600 ohms |
| Load voltage L+ | 24 V DC; only required for supplying 2-wire transmitters |
| Basic conversion time | 52 μs per channel |
| Basic execution time | 0.42 ms with all channels released |
| Diagnostics function | No |
Applications
- Analog voltage and current measurement: The module performs voltage and current measurement through its analog inputs.
- Resistance measurement: The module performs resistance measurement with two-wire, three-wire and four-wire connections.
- 2-wire transmitter supply: The module supplies connected, fully controlled 2-wire transmitters when 24 V DC load voltage L+ is provided.
Key Features
- 8 isolated analog inputs: The SM 431 module has 8 analog inputs for voltage/current measurement and 4 inputs for resistance measurement.
- Supported input ranges: Voltage ranges include 1 V to 5 V, -1 V to +1 V and -10 V to +10 V; current ranges include -20 mA to +20 mA and 4 mA to 20 mA; resistance range is 0 to 600 ohms.
- 14 bit resolution: Resolution with overrange is 14 bit including sign. Basic conversion time is 52 μs per channel.
- 24 V supply for 2-wire transmitters: Load voltage L+ is 24 V DC and is only required for supplying 2-wire transmitters. Maximum input current from L+ without load is 200 mA for 8 connected, fully controlled 2-wire transmitters.
- Signal encoder connections: The module supports voltage measurement, 2-wire and 4-wire current measurement, and resistance measurement with two-wire, three-wire or four-wire connection.
- Electrical isolation: The analog inputs are isolated from the backplane bus and load voltage L+, but the channels are not isolated from each other.
Frequently Asked Questions
1. How many analog inputs does 6ES7431-1KF20-0AB0 have?
It has 8 isolated analog inputs. All 8 inputs support voltage and current measurement, while 4 support resistance measurement.
2. Which signal ranges does this analog input module support?
Voltage ranges are 1 V to 5 V, -1 V to +1 V and -10 V to +10 V. Current ranges are -20 mA to +20 mA and 4 mA to 20 mA. The resistance range is 0 to 600 ohms.
3. What resolution and conversion time does it provide?
Resolution with overrange is 14 bit including sign, and basic conversion time is 52 μs per channel.
4. Does it require a 24 V supply?
Load voltage L+ is 24 V DC and is only required for supplying 2-wire transmitters.
5. Are diagnostics and channel isolation included?
The diagnostics function is not available. The analog inputs are isolated from the backplane bus and load voltage L+, but not from each other.
