Product Overview
Applications
Connection of signal encoders for voltage measurement is possible.
Current measurement is supported with 2-wire transducers using an external transmitter supply and with 4-wire transducers.
Resistance measurement is supported with two-wire, three-wire, and four-wire connections.
Technical Summary
| Product type | SIMATIC S7-400 SM 431 analog input module |
|---|---|
| Analog inputs | 8 |
| Voltage/current measurement inputs | 8 |
| Resistance measurement inputs | 4 |
| Resolution with overrange | 13 bit |
| 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; usable up to 500 ohms |
| Backplane-bus input current | 350 mA from backplane bus 5 V DC, maximum |
| Basic conversion time | 23 / 25 ms |
| Product lifecycle | Announcement of product phase-out |
Key Features
8 analog inputs; 8 for voltage/current measurement and 4 for resistance measurement.
Voltage, current, and resistance ranges are supported; thermocouple and resistance thermometer ranges are not.
1 V to 5 V, -1 V to +1 V, and -10 V to +10 V; input resistance is 200 kΩ for each range.
-20 mA to +20 mA and 4 mA to 20 mA; input resistance is 80 Ω for each range.
0 to 600 ohms is supported, usable up to 500 ohms; the constant measurement current is typically 1.67 mA.
Analog inputs are isolated from the backplane bus; resolution with overrange is maximum 13 bit, and integration time is parameterizable.
Frequently Asked Questions
What is the exact product identity?
It is the Siemens 6ES7431-1KF00-0AB0 SIMATIC S7-400 SM 431 analog input module.
How many analog inputs are available for voltage and current measurement?
It has 8 analog inputs for voltage and current measurement.
Which resistance ranges and connections are supported?
The 0 to 600 ohms range is supported and usable up to 500 ohms, with two-wire, three-wire, and four-wire connections.
Is the module isolated from the backplane bus?
Yes. The analog inputs are isolated from the backplane bus, but not between channels.
What should be included with a quotation request?
Include the requested quantity, destination, schedule context, and any additional BOM lines.
