Product Overview
Applications
The module supports voltage, current, resistance, thermocouple and resistance thermometer measurement through its analog inputs.
The module supports parameterizable diagnostic alarms, limit value alarms and hardware interrupts.
Technical Summary
| Product | SIMATIC S7-400 analog input SM 431, 6ES7431-7QH00-0AB0 |
|---|---|
| Analog inputs | 16; 16 for voltage/current measurement and 8 for resistance measurement |
| Resolution | 16 bit including sign, with overrange |
| Input signals | Voltage, current, thermocouple, resistance thermometer and resistance |
| Rated load voltage L+ | 24 V DC; only required for supplying 2-wire transmitters |
| Diagnostics and alarms | Parameterizable diagnostics, diagnostic alarms, limit value alarms and hardware interrupts |
| Signal encoder connections | Voltage; 2-wire and 4-wire current; 2-, 3- and 4-wire resistance |
Key Features
The SM 431 has 16 analog inputs for voltage/current measurement and 8 inputs for resistance measurement. The analog inputs are isolated from the backplane bus and load voltage L+ but not between channels.
Supported input ranges include voltage, current, thermocouple, resistance thermometer and resistance. Voltage ranges include 1 V to 5 V, -10 V to +10 V and -250 mV to +250 mV; current ranges include 0 to 20 mA and 4 mA to 20 mA.
Resolution with overrange is 16 bit including sign. Basic conversion time is 6 / 20,1 / 23,5 ms, with parameterizable integration time.
Rated load voltage L+ is 24 V DC and is only required for supplying 2-wire transmitters. Input current from L+, without load, is maximum 400 mA for 16 connected, fully controlled 2-wire transmitters.
The module has parameterizable diagnostics, diagnostic alarms, limit value alarms and hardware interrupts. Diagnostic information is readable, with INTF and EXTF red LEDs.
Parameterizable temperature compensation supports external compensation with Pt100, a compensation socket or a dynamic reference temperature value. Signal encoders support voltage, 2-wire and 4-wire current, and 2-, 3- and 4-wire resistance connections.
Frequently Asked Questions
What is the exact Siemens line item?
It is Siemens 6ES7431-7QH00-0AB0, a SIMATIC S7-400 analog input SM 431 with 16 isolated AI.
Which signals can this analog input module measure?
It supports voltage, current, thermocouple, resistance thermometer and resistance measurement, including 1 V to 5 V, 0 to 20 mA, 4 mA to 20 mA, Pt100 and multiple thermocouple types.
What supply is required for 2-wire transmitters?
Rated load voltage L+ is 24 V DC and is only required for supplying 2-wire transmitters.
What should I provide for a project quotation?
Provide the requested quantity, destination, schedule context and any additional BOM lines for this exact line item.
