The Siemens 6ES7961-3AA00-0AC0 is an IF961-CT1 incremental counter module for the SIMATIC S7-400 series. It captures encoder pulses from motion axes or conveyor segments, feeding position and speed data back to the CPU for closed-loop control or monitoring.
This module carries a lifecycle stage of mature, meaning it is not in active new-production but remains available through qualified surplus and broker channels.