Counter module for S7-300, 500 kHz counting
The Siemens 6ES7350-1AH00-0AE0 is a SIMATIC S7-300 counter module, specifically the FM 350-1, designed for counter functions up to 500 kHz. It plugs into the S7-300 rack and handles high-speed counting tasks that a standard CPU-integrated counter cannot reliably capture — think encoder feedback, flow-meter pulses, or position tracking where missing an edge means losing a part.
Lifecycle status and sourcing
This part carries an eol_hot lifecycle stage, indicating Siemens has ended regular production.
Fit with S7-300 and physical integration
The 500 kHz counting ceiling means this module handles incremental encoders, proximity-pulse trains, and flow-meter outputs up to that frequency. Below that, the hardware counter captures every edge without burdening the CPU scan cycle — a common failure mode on systems that try to count fast pulses through a standard digital input.