Siemens 6ES7-138-4DE02-0AB0 1-Channel Counter Module

Siemens 6ES7-138-4DE02-0AB0 is a 1-channel high-speed counter module for the SIMATIC ET 200S family, part of the 1Count5V line, designed to count encoder pulses up to 500 kHz. The module accepts incremental encoder signals with differential outputs (A, A/; B, B/; Z), enabling precise pulse counting for position and speed feedback in automation tasks. It is intended for ET 200S installations and replaces 6ES7 138-4DE01-0AB0; Siemens notes the 1Count5V/500kHz variant is fully compatible with the earlier version. Typical use cases include motor drive feedback, conveyor counting, and other motion-control tasks that rely on fast, reliable single-channel counting.