Siemens 6ES7 350-1AH03-0AE0 Simatic S7 PLC CPU Module

FM350-1 COUNTER MODULE (6ES7350-1AH03-0AE0) for SIMATIC S7-300 adds a dedicated single-channel high-speed counter to a PLC rack. It accepts 5 V or 24 V incremental encoder signals and supports isochronous mode for precise counting in automation environments. With a maximum counting rate of up to 500 kHz, this module expands the S7-300's monitoring capabilities for encoder-driven speed and position tasks and is designed to be installed alongside active bus modules. Common applications include counting encoder pulses for speed measurement on conveyors, position tracking in automated lines, and other motion-control tasks where fast, reliable pulse counting is required. The FM350-1 module is referenced in Siemens PCS 7 and S7-300 module catalogs as a one-channel counter block, highlighting its role as an expansion device rather than a central processor unit.