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Siemens 6ES7331-7KB01-0AB0 — Analog Input Modules

Siemens 6ES7331-7KB01-0AB0 S7-300 Analog Input, EOL

MPN6ES7331-7KB01-0AB0
End of Life

Siemens SIMATIC S7-300, SM 331 analog input module 6ES7331-7KB01-0AB0, 2 AI, optically isolated, 9/12/14 bit resolution, U/I/TC/RTD, interrupts, diagnostics, 20-pin, hot-swap.

$223.95 – $295.00Ref. price · indicative, final on quote
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

6ES7331-7KB01-0AB0 — Specifications
ParameterValue
Siemens6ES7331-7KB01-0AB0 (has been upgraded to 6ES7331-7KB02-0AB0)
Successor6ES7331-7KB02-0AB0
PLM effective dateEnd of product lifecycle since: 01.10.2004
Product descriptionSIMATIC S7-300, ANALOG INPUT SM 331, OPTICALLY ISOLATED, 2 AI, 9/12/14 BITS RESOLUTION, U/I/THERMOCOUPLE/RESISTANCE, INTERRUPT, DIAGNOSTICS, 20 PIN, REMOVE/INSERT W. BACKPLANE BUS
Successor descriptionSIMATIC S7-300, ANALOG INPUT SM 331, OPTICALLY ISOLATED, 2 AI, 9/12/14 BITS RESOLUTION, U/I/THERMOCOUPLE/RESISTANCE, ALERT, DIAGNOSTICS, 1 X 20 PIN, REMOVE/INSERT W. BACKPLANE BUS
Export control regulationsECCN : EAR99H / AL : N
Standard lead time ex-worksOn request
Obligation category for taking back electrical and electronic equipment after useNo obligation to take back electrical and electronic equipment after use

Product details

This is the Siemens SIMATIC S7-300 SM 331 analog input module, order code 6ES7331-7KB01-0AB0. It provides two analog inputs with optical isolation, configurable resolution from 9 to 14 bits. Accepts voltage, current, thermocouple, and resistance signals. Supports interrupts and diagnostics, and connects via a 20-pin front connector with hot-swap capability on the backplane bus.

Mounts in any S7-300 rack, occupies one slot. The 20-pin front connector is wired per standard SM 331 pinout. Hot-swap feature allows module replacement while bus is powered, but all field circuits must be de-energized. No hardware rewiring is needed when swapping to the successor 6ES7331-7KB02-0AB0; same mechanical and electrical interface.

Frequently asked questions

What is the official successor?

The successor is 6ES7331-7KB02-0AB0. It has the same inputs and physical dimensions, with the main change being 'ALERT' instead of 'INTERRUPT'.

How can I source the 6ES7331-7KB01-0AB0 today?

Since it's obsolete, sourcing is via surplus or broker channels. Submit an RFQ for a quoted lead time and availability.

Will the 6ES7331-7KB01-0AB0 fit a panel wired for the successor?

Yes, it is mechanically and electrically interchangeable with the successor 6ES7331-7KB02-0AB0. No rewiring needed.

MPN
6ES7331-7KB01-0AB0