What this module does in the cabinet
This Siemens 6ES7174-0AA10-0AA0 is an encoder interface module for SIMATIC S7-300 systems. It reads incremental and absolute encoders via RS422 5 V differential signals, supporting Gray or binary code with A/B and zero-mark traces. Pulse frequency up to 750 kHz, clock parameterizable to 1.5 MHz.
Supply and signal details
Draws 12 W typical from a 24 V DC supply (L+). The 5 V differential input (RS422) is used for encoder data; signal levels for logic '0' are -3 to +5 V, for logic '1' are +11 to +30 V. Output current is limited to 60 mA maximum per channel, short-circuit proof with minimum 3.3 kΩ load. Two-wire sensor inputs and a bipolar ±10 V analog input expand the feedback options.