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Siemens part number decoder
Paste any Siemens order number (MLFB) to see what product family it belongs to, how it's written on the nameplate, and whether we have it in stock.
How a Siemens order number is built
Most Siemens industrial parts carry a 16-character order number, also called the MLFB (Maschinenlesbare Fabrikatebezeichnung, "machine-readable product designation"):
6SN1145-1BA01-0BA1
- First 4 characters: the product family (here 6SN1 = SIMODRIVE 611).
- Next 3 digits: the product type within the family (145 = infeed module).
- Middle block: rating, size and version.
- Last block: options and variant.
On nameplates the number is often printed with a space after the fourth character (6SN1 145-1BA01-0BA1). It is the same part.
This tool decodes to family level. Siemens doesn't publish a complete position-by-position key, and the meaning of the middle and last blocks differs per product line. For the exact variant, check the Siemens catalogue (the tool links you there) or ask us.
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Get an offerSiemens prefixes the decoder knows
Where two rows match, the longer (more specific) prefix wins.
SIMATIC PLC
| Prefix | Family | What it is |
|---|---|---|
6ES5 | SIMATIC S5 | Legacy S5 PLC generation (CPUs, I/O, power supplies). Discontinued, widely still in service. |
6ES7 | SIMATIC S7 / ET 200 | S7 PLCs, distributed I/O and accessories. |
6ES713 | ET 200 I/O modules | Distributed I/O modules for ET 200S / ET 200SP (digital and analog). |
6ES714 | ET 200pro / ET 200eco | Distributed I/O for mounting on the machine (IP65/67). |
6ES715 | ET 200 interface modules | Head modules: IM 151 (ET 200S), IM 153 (ET 200M), IM 155 (ET 200SP). |
6ES721 | S7-200 or S7-1200 CPU | Compact CPU. Middle block ending in 2x (e.g. -1AD23) is usually S7-200; ending in 3x/4x (e.g. -1AG40) is usually S7-1200. |
6ES722 | S7-200 / S7-1200 digital I/O | Expansion modules (SM 1221/1222/1223 or EM 22x). Same 2x vs 3x/4x rule as the CPUs. |
6ES723 | S7-200 / S7-1200 analog I/O | Analog expansion modules (SM 1231/1232/1234 or EM 23x). |
6ES730 | S7-300 power supply | PS 307 load power supplies. |
6ES731 | S7-300 CPU | S7-300 CPUs (312 to 319, compact and fail-safe variants). |
6ES732 | S7-300 digital I/O | SM 321 / 322 / 323 digital signal modules. |
6ES733 | S7-300 analog I/O | SM 331 / 332 / 334 analog signal modules. |
6ES734 | S7-300 communication | CP 340 / 341 serial communication processors. |
6ES735 | S7-300 function modules | FM 350 to 357: counting, positioning, controllers. |
6ES736 | S7-300 interface modules | IM 360 / 361 / 365 rack expansion. |
6ES739 | S7-300 accessories | Mounting rails (390), front connectors (392). |
6ES740 | S7-400 racks & power | UR racks and PS 407 power supplies. |
6ES741 | S7-400 CPU | S7-400 CPUs (412 to 417, H and F variants). |
6ES742 | S7-400 digital I/O | SM 421 / 422 digital signal modules. |
6ES743 | S7-400 analog I/O | SM 431 / 432 analog signal modules. |
6ES745 | S7-400 function modules | FM 450 to 458: counting, positioning. |
6ES746 | S7-400 interface modules | IM 460 / 461 rack expansion. |
6ES750 | S7-1500 power | PS / PM power supply modules. |
6ES751 | S7-1500 CPU | S7-1500 CPUs (1511 to 1518, compact, F and T variants). |
6ES752 | S7-1500 / ET 200MP digital I/O | Digital signal modules. |
6ES753 | S7-1500 / ET 200MP analog I/O | Analog signal modules. |
6ES754 | S7-1500 communication | CM / CP communication modules. |
6ES755 | S7-1500 technology modules | TM counting, positioning and timer modules. |
6ES759 | S7-1500 accessories | Mounting rails, front connectors. |
6ES76 | PC-based automation | Software controllers and PC-based automation components. |
6ES78 | Engineering software | STEP 7, TIA Portal and related licences. |
6ES79 | S7 accessories | Memory cards, PROFIBUS bus connectors, programming cables. |
6AG1 | SIPLUS | Ruggedised version (extended temperature / conformal coating) of the matching 6ES7 part. |
SIMATIC HMI
| Prefix | Family | What it is |
|---|---|---|
6AV2 | HMI panels (TIA Portal) | Current generation Basic, Comfort and Unified panels. |
6AV3 | Legacy operator panels | Early OP / TD text and operator displays. |
6AV6 | HMI panels (WinCC flexible) | Previous generation OP / TP / MP panels, plus WinCC software licences. |
6AV7 | Panel PCs & industrial monitors | SIMATIC Panel PC, flat panels and thin clients. |
Power supplies
| Prefix | Family | What it is |
|---|---|---|
6EP1 | SITOP power supply | SITOP DIN-rail power supplies. |
6EP3 | SITOP power supply | SITOP PSU series power supplies. |
6EP4 | SITOP add-on modules | UPS, buffer, redundancy and selectivity modules. |
Industrial networks
| Prefix | Family | What it is |
|---|---|---|
6GK1 | PC communication | Network cards and SOFTNET communication software for PCs. |
6GK5 | SCALANCE | Industrial Ethernet switches, routers and wireless. |
6GK7 | S7 communication processors | CP modules for S7-300 / 400 / 1200 / 1500 (Ethernet, PROFIBUS). |
6XV1 | Network cables | PROFIBUS / PROFINET / Industrial Ethernet cable by the metre. |
SINUMERIK CNC
| Prefix | Family | What it is |
|---|---|---|
6FC5 | SINUMERIK | CNC controls: NCUs, operator panels, PCUs, machine control panels. |
6FC5203 | SINUMERIK operator panel front | OP 010 / 012 / 015 operator panel fronts. |
6FC5210 | SINUMERIK PCU | PCU 20 / PCU 50 panel control units. |
6FC535 | SINUMERIK 840D NCU | NCU modules for the 840D (powerline) CNC. |
6FC537 | SINUMERIK 840D sl NCU | NCU and NX modules for the 840D sl CNC. |
6FC5410 | SINUMERIK 810D CCU | CCU control modules for the 810D CNC. |
6FX2 | SINUMERIK accessories | Handwheels and handheld units. |
Motion cables
| Prefix | Family | What it is |
|---|---|---|
6FX5 | MOTION-CONNECT 500 | Pre-assembled power and signal cables for drives and motors. |
6FX8 | MOTION-CONNECT 800 | Pre-assembled high-flex power and signal cables. |
SIMODRIVE drives
| Prefix | Family | What it is |
|---|---|---|
6SN1 | SIMODRIVE 611 | Modular drive system for CNC machines. |
6SN1118 | SIMODRIVE 611 control module | 611 analog / 611U / 611D closed-loop control modules. |
6SN1123 | SIMODRIVE 611 power module | Axis power modules (single and double axis). |
6SN1145 | SIMODRIVE 611 infeed module | UE (unregulated) and I/R (infeed / regenerative feedback) modules. |
6SN1146 | SIMODRIVE 611 infeed module | I/R infeed / regenerative feedback modules. |
SINAMICS drives
| Prefix | Family | What it is |
|---|---|---|
6SL3 | SINAMICS | Current Siemens drive family (S120, G120, V20, V90 and others). |
6SL3000 | SINAMICS line-side components | Line reactors and line filters. |
6SL3040 | SINAMICS Control Unit | CU320 / CU310 control units for S120. |
6SL3054 | SINAMICS memory card | CompactFlash / memory cards with firmware for control units. |
6SL3055 | SINAMICS Sensor Module | SMC / SME encoder interface modules. |
6SL3060 | DRIVE-CLiQ cable | DRIVE-CLiQ signal cables. |
6SL3120 | SINAMICS S120 Motor Module | Booksize motor modules (single and double). |
6SL3121 | SINAMICS S120 Motor Module | Booksize compact motor modules. |
6SL3130 | SINAMICS S120 Line Module | Smart / Active line modules (infeed). |
6SL3131 | SINAMICS S120 Line Module | Line modules (infeed). |
6SL3210 | SINAMICS Power Module | Blocksize power modules (PM240, PM240-2, PM340) and compact drives. |
6SL3244 | SINAMICS G120 Control Unit | CU230 / CU240 / CU250 control units for G120. |
6SL3255 | SINAMICS operator panel | BOP / IOP operator panels. |
6RA8 | SINAMICS DCM | DC converters (successor to SIMOREG). |
Legacy drives
| Prefix | Family | What it is |
|---|---|---|
6SE64 | MICROMASTER 4 | MICROMASTER 420 / 430 / 440 frequency inverters. |
6SE70 | SIMOVERT MASTERDRIVES | MASTERDRIVES VC / MC drives. |
6RA7 | SIMOREG DC MASTER | DC drives (6RA70). |
Motors
| Prefix | Family | What it is |
|---|---|---|
1FK | Synchronous servomotor | SIMOTICS S 1FK servomotors (1FK6, 1FK7, 1FK2). |
1FT | High-dynamic servomotor | 1FT5 / 1FT6 / 1FT7 synchronous servomotors. |
1FL | Servomotor for SINAMICS V | 1FL6 / 1FL2 servomotors for V70 / V90. |
1FE | Built-in spindle motor | 1FE synchronous built-in motors for motor spindles. |
1PH | Main spindle motor | 1PH7 / 1PH8 induction motors for main spindles. |
1LA | Low-voltage induction motor | Standard 1LA induction motors. |
1LE | Low-voltage induction motor | SIMOTICS GP / SD 1LE induction motors. |
Switchgear
| Prefix | Family | What it is |
|---|---|---|
3RT | SIRIUS contactor | Power contactors (3RT1 previous, 3RT2 current generation). |
3RH | SIRIUS contactor relay | Control relays / auxiliary contactors. |
3RV | SIRIUS motor starter protector | Circuit breakers for motor protection. |
3RU | SIRIUS thermal overload relay | Thermal overload relays. |
3RB | SIRIUS electronic overload relay | Electronic overload relays. |
3RS | SIRIUS monitoring & interface relays | Temperature monitoring and coupling relays. |
3RK | AS-Interface / distributed starters | AS-i modules and distributed motor starters. |
3TK | SIRIUS safety relay | Safety relays (3TK28). |
3SB | Pushbuttons & indicator lights | Command and signalling devices. |
3SU | Pushbuttons & indicator lights | SIRIUS ACT command and signalling devices. |
3VA | Molded case circuit breaker | 3VA MCCBs. |
3VL | Molded case circuit breaker | 3VL MCCBs. |
5SY | Miniature circuit breaker | 5SY MCBs. |
Process instruments
| Prefix | Family | What it is |
|---|---|---|
7MF | SITRANS P | Pressure transmitters. |
7ME | SITRANS F | Flow meters. |
7ML | SITRANS L | Level measurement. |
7MH | SIWAREX | Weighing electronics. |
7NG | SITRANS T | Temperature transmitters. |
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