Siemens 6ES7451-3AL00-0AE0

FM 451 positioning module, 3 channels, rapid/creep traverse

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Siemens SIMATIC S7-400 FM 451 positioning module for rapid/creep traverse drives: 3 channels, incremental or SSI encoders, configuration package on CD.

Manufacturer: Siemens
Manufacturer part no.: 6ES7451-3AL00-0AE0
Product family: SIMATIC S7-400 PLC CPUs, I/O and Function Modules
Type: Positioning module
Category: PLCs and I/O › Counter, positioning and temperature modules
Lifecycle: Discontinued
OEM successor: Not stated
Technical datasheet: Data sheet

Technical specifications

Manufacturer: Siemens
Manufacturer part no.: 6ES7451-3AL00-0AE0
Type: Positioning module
Application: Positioning module
Used with: SIMATIC S7-400 rack
Supply voltage / Rated value (DC): 24 V
Input current / Current consumption, typ.: 550 mA
5 V encoder supply / 5 V: Yes
5 V encoder supply / Output current, max.: 210 mA
5 V encoder supply / 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
Power loss, typ.: 3.6 W
Number of digital inputs: 12; 4 per axis
Digital inputs / 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
Number of digital outputs: 12; 4 per axis
Digital outputs / Functions: Rapid traverse, creep, run right, run left
Digital outputs / 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

Show all 61 specifications

Output current / for signal "0" residual current, max.: 0.5 mA
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 digital inputs / Potential separation digital inputs: Yes
Potential separation digital outputs / Potential separation digital outputs: Yes
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
required front connector: 1x 48-pin
Width: 50 mm
Height: 290 mm
Depth: 210 mm
Weight, approx.: 1 300 g

Technical documents (1)

Siemens data sheet 6ES7451-3AL00-0AE0

Key features

3 positioning channels for drives with a rapid and a creep speed
4 digital inputs and 4 digital outputs per axis
Incremental encoders up to 1 MHz or SSI absolute encoders
5 V, 24 V and SSI encoder supplies
Discontinued by Siemens on 1 October 2026

About the Siemens 6ES7451-3AL00-0AE0

The Siemens 6ES7451-3AL00-0AE0 is the FM 451, the S7-400 positioning module for drives that run at a rapid and a creep speed, with 3 channels. Siemens's data sheet gives 4 digital inputs (reference cams, reversing cams, flying actual value setting, start/stop) and 4 digital outputs (rapid traverse, creep, run right, run left) per axis, incremental encoders up to 1 MHz or SSI absolute encoders, a 50 mm wide housing and 3.6 W typical power loss. SiePortal shows its phase-out announced on 1 October 2025 and its product cancellation on 1 October 2026.

What is the 6ES7451-3AL00-0AE0 used for?

It positions up to three axes driven at a rapid and a creep speed, under an S7-400 CPU.

Lifecycle and successor

Discontinued.

Before you order

What to photograph or confirm so the right unit is quoted.

Check the order number and firmware version on the module.

Other parts in the Siemens SIMATIC S7-400 family

Listed for reference. They differ from the 6ES7451-3AL00-0AE0 in rating, supply, interface or function and are not interchangeable with it unless Siemens says so. Match the part number on your unit.

Product	Type	Lifecycle	Qty Available	Price	Action
Siemens 6ES7431-7QH00-0AB0SM 431 analog input, 16 AI, 16 bit, universal, diagnostics	Analog input module	Discontinued	On Request	On request	View
Siemens 6ES7431-7KF00-0AB0SM 431 analog input, 8 AI, 16 bit, U/I/thermocouple	Analog input module	Discontinued	On Request	On request	View
Siemens 6ES7431-7KF10-0AB0SM 431 analog input, 8 AI, 16 bit, resistance thermometers	Analog input module	Discontinued	On Request	On request	View
Siemens 6ES7431-0HH00-0AB0SM 431 analog input, 16 AI, 13 bit, non-isolated	Analog input module	Discontinued	On Request	On request	View
Siemens 6ES7432-1HF00-0AB0SM 432 analog output, 8 AO, 13 bit, U/I	Analog output module	Discontinued	On Request	On request	View
Siemens 6ES7450-1AP01-0AE0FM 450-1 counter module, 2 channels, up to 500 kHz	Counter module	Discontinued	On Request	On request	View
Siemens 6ES7452-1AH00-0AE0FM 452 electronic cam controller, 16 cam tracks	Cam controller module	Discontinued	On Request	On request	View
Siemens 6ES7455-0VS00-0AE0FM 455 C controller module, 16 continuous control channels	Controller module	Discontinued	On Request	On request	View
Siemens 6ES7455-1VS00-0AE0FM 455 S controller module, 16 step and pulse control channels	Controller module	Discontinued	On Request	On request	View
Siemens 6ES7492-1AL00-0AA0Front connector for S7-400 signal modules, 48-pole, screw contacts	Front connector	Discontinued	On Request	On request	View
Siemens 6ES7492-1BL00-0AA0Front connector for S7-400 signal modules, 48-pole, spring-loaded contacts	Front connector	Discontinued	On Request	On request	View
Siemens 6ES7492-1CL00-0AA0Front connector for S7-400 signal modules, 48-pole, crimp contacts	Front connector	Discontinued	On Request	On request	View

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