VFD vs Servo Drive: Key Differences
A side-by-side comparison of VFD and servo drive motor type, feedback, dynamic response, overload rating, cost, and applications for industrial engineers.
- Part number
- 6ES7451-3AL00-0AE0
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SIMATIC S7-400Siemens 6ES7451-3AL00-0AE0 SIMATIC S7-400 FM 451 3-Axis Positioning Motion Controller
SIMATIC S7-400 FM 451 positioning module, 3 channels for rapid/slow traverse drives.
Description
About the 6ES7451-3AL00-0AE0
About the 6ES7451-3AL00-0AE0
The Siemens 6ES7451-3AL00-0AE0 is a SIMATIC S7-400 FM 451 positioning module with 3 channels for rapid/slow traverse drives, each with 4 digital inputs and 4 digital outputs. It accepts symmetrical or asymmetrical incremental encoders up to 1 MHz and absolute SSI encoders, and it ships with the configuration package on CD.
Selection Notes
Pick the FM 451 when the drive interface is rapid/slow traverse control via digital outputs rather than an analog setpoint, since its 4 outputs per axis (rapid traverse, creep, run right, run left) drive two-speed or bang-bang positioning stages directly. The 300 m SSI cable run and 1 MHz symmetrical-encoder input frequency both exceed what most 25 m asymmetrical-encoder installations need, so match the encoder type to the cable run rather than defaulting to the symmetrical input.
Applications
Three independent rapid/slow traverse channels suit machines with multiple linear or rotary axes that position via two-speed drive logic rather than a continuous analog reference, such as gantry loaders or indexing tables on an S7-400 rack.
Specification
Full specification
Supply voltage 1
| Rated value (DC) | 24 V |
|---|
Input current 1
| Current consumption, typ. | 550 mA |
|---|
5 V encoder supply 10
| ●5V | Yes |
|---|---|
| Output current, max. | 210 mA |
| Cable length, max. | 35 m; at max. 210 mA |
| 24 V encoder supply: 24 V | Yes |
| 24 V encoder supply: Output current, max. | 300 mA |
| 24 V encoder supply: Cable length, max. | 100 m; at max. 300 mA |
| Absolute encoder (SSI) encoder supply: Absolute encoder (SSI) | Yes |
| Absolute encoder (SSI) encoder supply: Type of output voltage | 24 V DC |
| Absolute encoder (SSI) encoder supply: Output current, max. | 300 mA |
| Absolute encoder (SSI) encoder supply: Cable length, max. | 300 m; At max. 156 kbit/s |
Show all 75 specifications ↓ Show less ↑63 more values in Identification, Power loss, Digital inputs, Digital outputs, Encoder, Potential separation, Ambient conditions, Connection method, Dimensions, Weights, ETIM 10 EC001422, Approvals / Certificates, For use in hazardous locations, Logistics.
Identification 7
| Part number | 6ES7451-3AL00-0AE0 |
|---|---|
| Brand | Siemens |
| Condition | New, factory sealed |
| Source | Siemens and its authorised distributors |
| Warranty | Manufacturer warranty |
| Lifecycle status | Phase-out announced by the manufacturer |
| EAN | 4025515129363 |
Power loss 1
| Power loss, typ. | 3.6 W |
|---|
Digital inputs 7
| Number of digital inputs | 12; 4 per axis |
|---|---|
| Functions | Reference cams, reversing cams, flying actual value setting, start/stop positioning |
| Input voltage: Rated value (DC) | 24 V |
| Input voltage: for signal "0" | -30 to +5 V |
| Input voltage: for signal "1" | +11 to +30V |
| Input current: for signal "0", max. (permissible quiescent current) | 1.5 mA |
| Input current: for signal "1", typ. | 9 mA |
Digital outputs 6
| Number of digital outputs | 12; 4 per axis |
|---|---|
| Functions | Rapid traverse, creep, run right, run left |
| Short-circuit protection | Yes |
| Output voltage: for signal "1", min. | UP -3 V |
| Output current: for signal "1" permissible range for 0 to 55 °C, max. | 600 mA; with UPmax |
| Output current: for signal "0" residual current, max. | 0.5 mA |
Encoder 19
| Connectable encoders: Incremental encoder (symmetrical) | Yes |
|---|---|
| Connectable encoders: Incremental encoder (asymmetrical) | Yes |
| Connectable encoders: Absolute encoder (SSI) | Yes |
| Encoder signals, incremental encoder (symmetrical): Trace mark signals | A, notA, B, notB |
| Encoder signals, incremental encoder (symmetrical): Zero mark signal | N, notN |
| Encoder signals, incremental encoder (symmetrical): Input voltage | 5 V difference signal (phys. RS 422) |
| Encoder signals, incremental encoder (symmetrical): Input frequency, max. | 1 MHz |
| Encoder signals, incremental encoder (asymmetrical): Trace mark signals | A, B |
| Encoder signals, incremental encoder (asymmetrical): Zero mark signal | N |
| Encoder signals, incremental encoder (asymmetrical): Input voltage | 24 V |
| Encoder signals, incremental encoder (asymmetrical): Input frequency, max. | 50 kHz; for 25 m cable length, 25 kHz for 100 m cable length |
| Encoder signals, incremental encoder (asymmetrical): Cable length, shielded, max. | 100 m |
| Encoder signals, absolute encoder (SSI): Input signal | 5 V difference signal (phys. RS 422) |
| Encoder signals, absolute encoder (SSI): Data signal | DATA, notDATA |
| Encoder signals, absolute encoder (SSI): Clock signal | CL, notCL |
| Encoder signals, absolute encoder (SSI): Telegram length, parameterizable | 13 or 25 bit serial |
| Encoder signals, absolute encoder (SSI): Clock frequency, max. | 1.25 MHz |
| Encoder signals, absolute encoder (SSI): Gray code | Yes |
| Encoder signals, absolute encoder (SSI): Cable length, shielded, max. | 300 m; At max. 156 kbit/s |
Potential separation 2
| Potential separation digital inputs: Potential separation digital inputs | Yes |
|---|---|
| Potential separation digital outputs: Potential separation digital outputs | Yes |
Ambient conditions 4
| Ambient temperature during operation: min. | 0 °C |
|---|---|
| Ambient temperature during operation: max. | 55 °C |
| Ambient temperature during storage/transportation: min. | -40 °C |
| Ambient temperature during storage/transportation: max. | 70 °C |
Connection method 1
| required front connector | 1x 48-pin |
|---|
Dimensions 3
| Width | 50 mm |
|---|---|
| Height | 290 mm |
| Depth | 210 mm |
Weights 1
| Weight, approx. | 1 300 g |
|---|
ETIM 10 EC001422 3
| ETIM | 9 EC001422 |
|---|---|
| IDEA | 4 3567 |
| UNSPSC | 15 32-15-17-05 |
Approvals / Certificates 2
| General Product Approval Miscellaneous | For use in hazard- |
|---|---|
| General Product Approval EMV | ous locations |
For use in hazardous locations 1
| FM Type Examination Cer- | tificate |
|---|
Logistics 6
| Net weight | 1.466 kg |
|---|---|
| Country of origin | DE |
| Shipping weight | 1.966 kg |
| Ships from | Türkiye |
| Dispatch | — |
| Stock | On request |
Source: manufacturer data · Last verified: 01 Nov 2026
Documents
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Quick answers
Questions about the 6ES7451-3AL00-0AE0
Which supply voltage is 6ES7451-3AL00-0AE0 rated for?
The rated operational voltage of 6ES7451-3AL00-0AE0 is 24 V AC.
What is the HS code of 6ES7451-3AL00-0AE0 for customs?
The tariff (HS) code on file for 6ES7451-3AL00-0AE0 is 85389091.
What is the EAN of 6ES7451-3AL00-0AE0?
The EAN (GTIN) of 6ES7451-3AL00-0AE0 is 4025515129363.
Where does 6ES7451-3AL00-0AE0 ship from, and how fast?
6ES7451-3AL00-0AE0 ships from Türkiye. Shipping calculated at checkout · import duties and taxes paid on arrival.
Guides
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Reviews
Customer reviews
Series
Siemens SIMATIC S7-400
- Brand
- Siemens
- Series
- SIMATIC S7-400
