Siemens S7-400 FM451 three-channel rapid/creep positioning / 6ES7451-3AL00-0AE0

6ES7451-3AL00-0AE0: Three positioning channels for rapid-traverse/creep-speed drives, with incremental or SSI position feedback. Specifications follow the exact manufacturer table in the May 2017 catalogue; verify supplied revision, current lifecycle and availability separately.

Manufacturer part number: 6ES7451-3AL00-0AE0
Brand: Siemens
Category: PLC and HMI
Catalog status: Request a quotation

Technical specifications

Controller family: SIMATIC S7-400
Axes: 3 positioning channels
Digital inputs: 12; 4 per axis
Digital outputs: 12; 4 per axis for rapid traverse, creep, right and left operation
Input types: Symmetrical or asymmetrical incremental encoder; SSI absolute encoder
Symmetrical encoder input: 5 V differential RS-422; maximum 1 MHz
Asymmetrical encoder input: 24 V; maximum 50 kHz at 25 m cable or 25 kHz at 100 m cable
SSI interface: 13 or 25 serial bits, parameterizable; maximum clock 1.25 MHz; 300 m cable only at maximum 156 kbit/s
Power supply (nominal): 24 VDC
Current consumption: 550 mA maximum
Operating temperature: 0–55 °C
Protection rating: IP20
Required front connector: 1 x 48-pin; select suitable front connector
Width: 50 mm
Height: 290 mm
Depth: 210 mm
Weight: Approximately 1300 g
Document pages: PDF 76, 77
Current lifecycle status: Not established by historical May 2017 catalogue; confirm current lifecycle and supply separately

Manufacturer technical catalog · Siemens ST400 May 2017; exact technical and ordering tables, PDF 76, 77 · en · PDF · ST400 May 2017Manufacturer source: Siemens · Model explicitly covered in family document · Covered models: 6ES7451-3AL00-0AE0 · Checked: 2026-10-22Official manufacturer source

This sheet provides a quick technical summary. For design, installation and final selection, review the latest official manufacturer documentation and verify the complete part number.