Product Description
Key Features
- 8 analog inputs: The SM 331 has 8 analog inputs, all intended for resistance measurement.
- Supported sensors and ranges: It supports Cu 10, Ni 100/120/200/500/1000, Pt 100/200/500/1000, and resistance ranges of 0 to 150 ohms, 0 to 300 ohms, and 0 to 600 ohms.
- 2-, 3- and 4-wire connections: Resistance measurement supports two-wire connection without resistance correction, three-wire connection, and four-wire connection.
- Electrical supply and protection: Load voltage L+ is 24 V DC rated, with reverse polarity protection. Power loss is 4.6 W typical.
- Diagnostics and isolation: Diagnostics, diagnostic alarms, limit value alarms, and hardware interrupts are parameterizable. The analog inputs have potential separation between channels, in groups of 2, and from the backplane bus and electronics power supply.
- Physical connection: The module requires a 40-pin front connector and measures 40 mm wide, 125 mm high, and 120 mm deep. Weight is approximately 272 g.
Applications
- Resistance measurement: Measures resistance and resistance-thermometer signals through supported 2-, 3- and 4-wire connections.
Technical Summary
| Product lifecycle | Product cancellation |
|---|---|
| Product function | Analog input SM 331, isolated |
| Analog inputs | 8 |
| Measurement capability | Resistance measurement and resistance thermometer input |
| Supported resistance thermometers | Cu 10, Ni 100/120/200/500/1000, Pt 100/200/500/1000 |
| Resistance ranges | 0 to 150 ohms; 0 to 300 ohms; 0 to 600 ohms |
| Signal encoder connections | 2-wire without resistance correction; 3-wire; 4-wire |
| Load voltage L+ | 24 V DC rated |
| Front connector | 40-pin |
Frequently Asked Questions
What order number should be confirmed for this Siemens analog input module?
Confirm the complete order number 6ES7331-7PF01-0AB0 on the nameplate or installed documentation.
How many analog inputs does 6ES7331-7PF01-0AB0 have?
It has 8 analog inputs, all for resistance measurement.
Which connection types are supported for resistance measurement?
Two-wire connection without resistance correction, three-wire connection, and four-wire connection are supported.
Which front connector is required?
The module requires a 40-pin front connector.
What lifecycle data is recorded for this configuration?
The recorded lifecycle status is Product cancellation.
