8 NAMUR inputs at 20 kHz — the counter module for encoder-based position and speed
The Siemens 6ES7350-2AH01-0AE0 FM 350-2 is an 8-channel counter module for the S7-300 platform, accepting NAMUR encoder signals per DIN 19234, 24 V initiators, and 2-wire sensors on the same eight digital inputs. Each channel counts up to 20 kHz (incremental encoder mode: 10 kHz) with 32-bit or ±31-bit resolution, and the module generates a hardware interrupt on configurable count limits or gate events.
Typical power draw is 10 W from the 24 V DC backplane bus; the module's eight digital outputs each sink 0.5 A with resistive loads at up to 500 Hz switching frequency.